JP5618876B2 - Computer and distributed computer system - Google Patents

Description

  The present invention relates to a distributed computer system that performs communication between computer clusters using a publish-subscribe data communication system.

  In general, in the publish-subscribe data communication method, a computer group such as an IP multicast group is created according to a topic which is a data type, and a process for subscribing to the topic enters the computer group and distributes the topic. In many cases, by transmitting data to the group, transmission / reception of a desired topic is realized.

  In a distributed computer system (hereinafter referred to as a distributed computer system) formed by connecting a plurality of distributed computer systems (hereinafter referred to as computer clusters), when exchanging multicast data between computers belonging to different computer clusters, a plurality of If the computer belonging to the network receives the data, determines whether the data is required by the process in its own computer cluster or the data required by another computer cluster. For example, transmission / reception of multicast data between different computer clusters can be realized by transferring to the computer cluster (for example, Patent Document 1).

JP 2009-124767 A

  In the conventional publish-subscribe data communication system, topics are transmitted and received by IP multicast communication. Therefore, in a distributed system configured by combining a plurality of computer clusters, the network is different. You cannot send and receive topics between. Further, by combining Patent Publication 1 with conventional publication-subscription data communication, it is possible to realize topic transmission / reception in a distributed computer system as a target of the present invention. Since the computer to which it belongs always determines whether it should be transferred after receiving the data once, it also receives data that does not need to be received, and there is a problem that the load on the computers belonging to multiple networks is high. It was.

  The present invention allows a computer connected to a plurality of networks to receive a topic and transfer it to another network only when the topic exchanged on the local network needs the other network. Accordingly, it is an object of a computer belonging to a plurality of networks to reduce the load by eliminating the reception of data that does not require transfer.

The computer of this invention
In a computer that is connected to the same network as a plurality of other computers and forms a computer cluster together with the other computers,
Topic identification data for identifying a topic, a set of a multicast address and a port number used in communication in the network, a topic transmission process start time indicating a start time of a topic transmission process for transmitting the topic, and the topic A cluster that includes a computer in which the topic indicated by identification data is activated and includes an IP address of a computer that is connected to the network, and includes in-cluster topic management information in which the record for each topic identification data is registered. Internal management department,
When the topic transmission process of the same topic as the topic identification data registered in the topic management information in the cluster is activated in its own computer, the activation time of the topic transmission process that has been activated is detected, and the detected activation time, The topic transmission process start time of the topic identification data registered in the intra-cluster topic management information is compared. If the detected start time is in the past, the same topic identification data as the started topic is stored. The start time when the multicast address and the port number in the record are newly generated and changed based on a predetermined generation rule, and the topic transmission processing start time is detected in the same topic identification data record as the started topic The topic identification data is the same as the activated topic The change in the IP address of the computer connected to the network in the record is added to the IP address in the network of the own computer, and the change content in the record of the topic identification data that is the same as the activated topic is used as the change information. And an in-cluster notifying unit for notifying other computers connected to the network.

  According to the present invention, in a distributed system configured by combining a plurality of computer clusters, only when a topic exchanged on its own network is required on another network, the predetermined computer receives the topic and others It is possible to provide a distributed system that transfers data to other networks.

1 is a configuration diagram of a distributed computer system 4 according to a first embodiment. FIG. 2 is a block diagram showing an internal configuration of a computer according to the first embodiment. The table 7T which the publication / subscription computer management part 7 of Embodiment 1 has. FIG. 3 is a diagram illustrating data exchange between the topic transmission unit 8 and the topic reception unit 9 according to the first embodiment. The table 11T which the transfer topic management part 11 of Embodiment 1 has. FIG. 4 shows a data format of topic data in the first embodiment. The figure which simplified the system of FIG. The figure which shows the propagation within the same cluster of the transmission process in FIG. The figure which shows the propagation to the outside of a cluster of the transmission process in FIG. The figure which shows the propagation to the inside of another cluster of the transmission process in FIG. The figure which shows starting of the reception process in FIG. The figure which shows the propagation to the other cluster of the reception process in FIG. The figure which shows the propagation to the inside of the other cluster of the reception process in FIG. The figure which shows the delivery state of the topic data in FIG. The figure which shows the condition where the starting notification of the publication process start in the computer 1-1-1 of Embodiment 1 propagates in a cluster. The figure which shows the condition where the start notification of the subscription process start in the computer 1-1-2 of Embodiment 1 propagates in a cluster. The figure which shows the socket setting of the topic receiving part 9 of the computer 1-1-2 of Embodiment 1. FIG. FIG. 3 is a diagram illustrating propagation between repeaters in the publication process according to the first embodiment. The figure which shows the socket setting of the transfer topic receiving part 13 of the receiving computer of Embodiment 1. FIG. FIG. 6 is a diagram illustrating propagation of a publication process activation notification from another cluster according to the first embodiment. FIG. 3 shows topic transmission according to the first embodiment. 5 is a flowchart of a publish / subscribe computer notification unit 6 according to the first embodiment. 5 is a flowchart of the topic transmission unit 8 according to the first embodiment. 6 is a flowchart of the topic receiving unit 9 according to the first embodiment. 5 is a flowchart of a transfer topic notification unit 10 according to the first embodiment. 6 is a flowchart of the topic transfer unit 12 according to the first embodiment. 6 is a flowchart of the transfer topic receiving unit 13 according to the first embodiment. The figure which shows the propagation to the cluster of the topic delivery stop notification of Embodiment 2. FIG. The figure which shows the propagation to the cluster of the reception process deletion notification of Embodiment 2. FIG. The figure which shows the propagation to the other cluster of the topic delivery stop notification of Embodiment 2. FIG. The figure which shows the propagation to the cluster of the reception process deletion notification of Embodiment 2. FIG. 10 is a flowchart of the publish / subscribe computer management unit 7 according to the second embodiment. 10 is a flowchart of the topic transmission unit 8 according to the second embodiment. 10 is a flowchart of the topic receiving unit 9 according to the second embodiment. 9 is a flowchart of a transfer topic notification unit 10 according to the second embodiment. 10 is a flowchart of the topic transfer unit 12 according to the second embodiment. 10 is a flowchart of the transfer topic reception unit 13 according to the second embodiment. FIG. 4 shows an appearance of a computer according to a third embodiment. The figure which shows the hardware resource of the computer of Embodiment 3. FIG.

Embodiment 1 FIG.
FIG. 1 shows an example of the configuration of a distributed computer system targeted by the present invention.
As shown in FIG. 1, the distributed computer system targeted by the present invention is configured by connecting a plurality of computer clusters 3 to a network. For example, in FIG. 1, computers 1-1-1 to 1-1-6 are connected to a network 2-1, and constitute a computer cluster 3-1. Similarly, the computers 1-2-1 to 1-2-6 are connected to the network 2-2 and constitute a computer cluster 3-2. The computers 1-3-1 to 1-3-6 are connected to the network 2-3 to form a computer cluster 3-3. The network 2-4 connects the computer clusters 3-1 to 3-3 to configure the distributed computer system 4. In this configuration, if the networks to which computers are connected are different, direct communication between computers is not possible.

  In addition, “publishing process” and “transmission process” used below have the same meaning. “Subscription process” and “reception process” have the same meaning.

(Prerequisite)
(1) That is, in FIG. 1, it is assumed that the computers 1-1-5, 1-2-5, and 1-3-5 connected to the network 2-4 do not have a network router function. For example, in FIG. 1, a process operating on the computer 1-1-1 specifies the IP address of the computer 1-2-6 for a process operating on the computer 1-2-6 belonging to a different computer cluster. Cannot communicate with each other.
(2) However, the computers 1-1-5, 1-2-5, and 1-3-5 belong to different computer clusters, but are connected by the network 2-4. Direct communication is possible by specifying an address.
(3) The computers 1-1-5, 1-2-5, and 1-3-5 are referred to as data relay computers 5 (representative computers) of the computer clusters 3-1, 3-2, and 3-3, respectively. Call. It is assumed that the internal time of all the computers constituting the system is consistent with NTP (Network Time Protocol) or the like. A configuration and method for realizing publication-subscription data communication between computers on different computer clusters 3 in a distributed computer system as shown in the distributed computer system 4 will be described below.

  FIG. 2 is a configuration diagram of the publish-subscribe data communication system according to the first embodiment. The publish-subscribe communication system in the first embodiment is a publish / subscribe computer notification unit 6, a publish / subscribe computer management unit 7, a topic transmission unit 8, a topic reception unit 9, a transfer topic notification unit 10, and a transfer topic management unit. 11, a topic transfer unit 12, and a transfer topic reception unit 13.

(Publishing / Subscription Computer Notification Unit 6)
When the process of publishing or subscribing a topic on the computer is started, the publishing / subscribing computer notification unit 6 (intra-cluster notification unit)
(1) The topic name,
(2) IP address of the computer,
(3) Multicast IP address when sending a topic,
(4) Notifying all computers in the same computer cluster of port numbers and the like. Also, it receives a notification from the publish / subscribe computer notification unit 6 of another computer and registers it in the other publish / subscribe computer management unit 7.

(Publishing / Subscription Computer Management Department 7)
The publishing / subscription computer management unit 7 (intracluster management unit) receives the publishing / subscription computer notification unit 6.
(1) Each topic name (topic identification data),
(2) a multicast IP address to which the topic is transmitted;
(3) Port number,
(4) The process of publishing each topic,
(5) IP address of the computer where the subscribed process operates,
(6) IP multicast address setting time,
Have a role to hold.
For example, the publishing / subscription computer management unit 7 has a table 7T (intra-cluster topic management information) as shown in FIG. As will be described later, in addition to the publishing / subscription computer management unit 7, the transfer topic management unit 11 also has a table similar to FIG. 3 (hereinafter, FIG. 3 may be referred to as a table 7T, and FIG. 5 described later may be referred to as a table 11T). . In addition, explanations such as “Register in publishing / subscription computer management unit 7” or “Refer to publishing / subscription computer management unit 7” appear. These mean registration in table 7T, reference to table 7T, and the like. To do. The same applies to the transfer topic management unit 11.

  In the example of FIG. 3, an IP multicast when a process having IP addresses “192.168.1.1” and “192.168.1.3” transmits topic 1 data and receives topic 1 is received. The address is “239.192.168.0.1”, the port is 8000, and the computer on which the process receiving the topic operates is “192.168.1.1”, “192.168.1.2”, “192” .168.1.4 "indicates that the time when the IP multicast address is set is 12:34:56.

  Similarly, the computer on which the process on the computer “192.168.1.5” transmits topic 2 and the process on which the topic is received operates is the computer “192.168.1.1” and the computer “192.168.”. .1.4 ", computer" 192.168.1.5 ", IP multicast address for receiving topic 1 is" 239.192.100.2 ", port number is 8000, IP multicast address is set It is shown that the time is 11:12:13. In this table, only the hour, minute, and second are acquired, but the year, month, day, hour, minute, second, and millisecond (microsecond, nanosecond) may be acquired.

(Topic transmission unit 8)
The topic transmission unit 8 has a role of transmitting topic data transmitted by the transmission process onto a network that actually configures the same computer cluster. The topic transmission unit 8 may be a library data transmission API or a process or thread. As a data transmission method when the topic transmission unit 8 is a process or a thread, an area where data can be mutually accessed with the transmission process is created, the transmission process arranges data in the area, and the topic transmission unit 8 It is conceivable that a process or a thread of the data is transferred.

(Topic receiver 9)
The topic receiving unit 9 has a role of receiving transmitted topic data. The topic receiving unit 9 may be a library transmission API, a process, or a thread. As a method of receiving data when the topic receiving unit 9 is a process or thread, an area where data can be mutually accessed with the receiving process is created, and the topic receiving unit 9 arranges data in the area, A method in which the receiving process receives data is conceivable.

  FIG. 4 shows a method of passing data between the transmission process and the topic transmission unit 8 when the topic transmission unit 8 is a process or thread and the topic reception unit 9 is a process or thread, the reception process and the topic reception unit 9. Is an example of data transfer to and from.

(Forward topic notification unit 10)
The transfer topic notification unit 10 (representative computer-to-computer notification unit) notifies all data relay computers 5 connected to the network connecting the computer clusters when the topic transmission process is started on a computer in the computer cluster to which the own computer belongs. Determine the multicast IP address and port number for sending the topic,
(1) Topic name
(2) Multicast IP address for sending the topic,
(3) Notify the other forwarding topic notification unit 10 of the port number. Further, when the notification is received from another transfer topic notification unit 10, the transfer topic management unit 11 is referred to, and if a process for subscribing to the topic is activated in the own computer cluster, the notification is sent. The transmission topic notification unit 10 of the transmission source is notified that the data subscription process is activated in the own computer cluster.

(Transfer Topic Management Unit 11)
The transfer topic management unit 11 (representative computer management unit)
(1) Topic name exchanged between data relay computers in a computer cluster,
(2) IP address of the data relay computer that transmits / receives the topic,
(3) IP multicast address and port number for sending and receiving topics,
(4) IP multicast address setting time, etc.
Hold.

  The transfer topic management unit 11 has a table 11T as shown in FIG. In the example of FIG. 5, the computer with “192.168.1.5” as the topic 1 multicasts to the IP multicast address “239.192.901.101” and the port 8000, and the relay computer “192.168.8.2. 5 ”and“ 192.168.3.5 ”are received, and the time when the IP multicast address is set is 12:34:56.

(Topic transfer unit 12)
The topic transfer unit 12 has a role of receiving a topic from a topic receiving unit and transmitting it to a data relay computer of the computer cluster when a topic transmitted by the own computer cluster is required by another computer cluster.

(Forward topic receiving unit 13)
The transfer topic receiving unit 13 has a role of receiving topic data transmitted from another computer cluster and passing it to the topic transmitting unit 8. Note that the transfer topic notification unit 10, the transfer topic management unit 11, the topic transfer unit 12, and the transfer topic reception unit 13 need only be held by the data relay computer.

(Topic data format)
An outline of a format of a buffer for storing topic data in the first embodiment is shown in FIG. As shown in FIG. 6, the buffer is divided into a header part and a body part. The header part includes a topic name, a source IP address, and the like, and stores data to be transmitted in the body part. Hereinafter, the combination of the header part and the body part in FIG. 6 is referred to as “data”.

  The outline of the operation of the present system will be described with reference to FIGS. In this operation overview, description will be made assuming that the operation starts from an initial state in which no record is registered in the table 7T and the table 11T. FIG. 7 is a simplified diagram of FIG. For simplification of description, the computer clusters 3-1 and 3-2 will be described. In the computer cluster 3-1, "192.168.11" of the computer 1-1-1 indicates the IP address of the computer. The same applies to other computers.

(Propagation within the same cluster (each computer) of the transmission process)
FIG. 8 is a diagram for explaining a state in which “transmission process activation information” of topic 1 is propagated to the same cluster when the transmission process of “topic 1” is activated in the computer 1-1-1. When the topic 1 transmission process is activated, the publication / subscription computer notification unit 6 on the computer 1-1-1 detects the topic 1 transmission process activation and sets the process activation detection time (12:34:56, hereinafter. , 12:34:56) (topic transmission processing start time) is acquired. The publish / subscribe computer notification unit 6 refers to the publish / subscribe computer management unit 7 on its own computer and checks whether or not the record of the table 7T for transmitting the topic 1 is registered. In this example, it is not registered because it is in an initial state. Therefore, the publishing / subscribing computer notifying unit 6 of the computer 1-1-1 sets the IP multicast address and the port number to “239.68.1. 1 ”and“ 30001 ”. Then, as shown in FIG. 8, the publishing / subscription computer notifying unit 6 sends the publishing / subscription computer notifying unit 7 of the computer 1-1-1 to
(1) Topic name; Topic 1,
(2) IP multicast address, port number; “239.168.1.1”, “30001”,
(3) Address registration time (process activation detection time); “12:34:56”,
(4) Transmission computer IP address; IP address of computer 1-1-1.
Register the record. The publish / subscribe computer notifying unit 6, which is the start computer that has started the transmission process, notifies the other computer in the same cluster 3-1 of the contents of the table 7T in which the information is registered.
As will be described later, the publishing / subscription computer notification unit 6 notifies the other publishing / subscription computer notification units 6 in the same cluster using, for example, a preset multicast address. FIG. 8 shows that the computers 1-1-3 and 1-1-5 have the same table 7T.

(Propagation of transmission process to other clusters)
FIG. 9 shows a state in which the content of the transmission process activation information received from the computer 1-1-1 is propagated to another cluster (in this example, the computer cluster 3-2) by the relay computer 1-1-5. FIG. As shown in FIG. 9, in the relay system computer 1-1-5, the publication / subscription computer notification unit 6 of the relay system computer 1-1-5 receives the transmission process activation information from the computer 1-1-1, The transfer topic notification unit 10 is notified of the content of this information. Upon receiving the notification from the publishing / subscription computer notification unit 6, the transfer topic management unit 11 registers a record in the table 11T. At the time of registration, the transfer topic notification unit 10 of the relay computer 1-1-5 determines the IP multicast address and port number for inter-cluster communication as “239.169.1.1” and “30002”, respectively. .
The contents of notification from the publication / subscription computer notification unit 6 are registered at the address registration time (process activation detection time) in the table 11T. Further, the IP address of the relay computer 1-1-5 is registered in the transmission computer IP address column. This is because when the topic 1 data is transferred to another cluster, the relay computer 1-1-5 becomes a transmission computer in the inter-cluster communication. As shown in FIG. 9, the transfer topic notification unit 10 of the relay computer 1-1-5 notifies the contents of the registered table 11T to the relay computers of other clusters. As will be described later, notification of other clusters by the transfer topic notification unit 10 is performed using, for example, a preset multicast address. The contents of the table 11T are the same between the relay computers. As a result, as shown in FIG. 9, the activation information of the transmission process is propagated to the relay computers of other clusters. FIG. 9 shows that the relay computer 1-2-5 has a table 11T having the same contents as the relay computer 1-1-1.

(Propagation to the inside of each other cluster (each computer))
FIG. 10 shows a situation in which the transmission information of the transmission process is propagated from the relay computer to the computers in the same cluster when the relay computer of the cluster receives the transmission process activation information from the relay computer of the other cluster. . The upper part of FIG. 10 shows the transfer topic notification unit when the transfer topic notification unit 10 of the relay computer 1-2-5 receives the transmission process activation information from the transfer topic notification unit 10 of the relay computer 1-1-5. 10 shows how the publishing / subscription computer notification unit 6 notifies the publishing / subscription computer notification unit 6 of the received content, and the publishing / subscription computer notification unit 6 registers it in the table 7T of the relay computer 1-2-5. That is, when the publish / subscribe computer notification unit 6 of the relay computer 1-2-5 receives the notification from the transfer topic notification unit 10, the IP multicast address used when transferring the data of the topic 1 in the computer cluster 3-2, The port numbers are determined as “240.169.1.1” and “30001”, respectively. Further, the own computer IP address is set in the transmission computer of the table 7T. This is because the relay computer 1-2-5 becomes a transmission source of the data of topic 1 in the computer cluster 3-2. Information in the table 7T of the relay computer 1-2-5 is notified to the publish / subscribe computer notification unit 6 of other computers in the same cluster by the publish / subscribe computer notification unit 6 of the relay computer 1-2-5. . With the above operation, the transmission process activation information activated by the computer 1-1-1 of the computer cluster 3-1 is propagated to each computer of the other computer cluster 3-2. The same applies to other computer clusters other than the computer cluster 3-2.

(Propagation to the same cluster (each computer) of the receiving process)
FIG. 11 is a diagram illustrating a case where a reception process that wishes to subscribe to topic 1 is started on the computer 1-2-2 of the computer cluster 3-2. When the reception process is started in the computer 1-2-2, the publish / subscribe computer notification unit 6 of the computer 1-2-2 detects this, and as shown in FIG. The name (topic) 1 and the own computer IP address activated by the reception process are multicast to the same cluster. This multicast uses a preset multicast address for notification. In other computers such as the relay computer 1-2-5 in the same cluster, the publishing / subscription computer notification unit 6 receives this notification, and in the column of the reception computer of the table 7T, the computer 1-2 that is the reception computer. -2 IP address is registered.

(Propagation of receiving process to other clusters)
FIG. 12 is a diagram illustrating propagation of the reception process to another cluster (another relay computer). The publish / subscribe computer notification unit 6 of the relay computer 1-2-5 notifies the transfer topic notification unit 10 when receiving the activation information (topic name, reception computer IP address) of the reception process. Upon receiving this notification, the transfer topic notification unit 10 registers its own IP address (relay computer 1-2-5) in the receiving computer column of the topic 1 record in the table 11T as shown in FIG. The topic name (topic 1) and the IP address of the receiving computer (IP address of the relay computer 1-2-5) are notified to the transfer topic notification unit 10 of the relay computer of another cluster. As shown in the lower part of FIG. 12, the forwarding topic notification unit 10 of the relay computer 1-1-5 also notifies the topic name (topic 1) and the IP address of the receiving computer (IP address of the relay computer 1-2-5). And the IP address of the relay computer 1-2-5 is registered in the receiving computer column of topic 1 of the table 11T.

(Propagation of reception process to other clusters (each computer))
FIG. 13 is a diagram illustrating propagation of other processes in the cluster (each computer). When the notified content is registered in the table 11T, the transfer topic notification unit 10 of the relay computer 1-1-5 notifies the publishing / subscription computer notification unit 6 of the notified content. Upon receiving this notification, the publishing / subscription computer notifying unit 6 registers the IP address of the relay computer 1-1-5 in the receiving computer column of the table 7T. The publish / subscribe computer notification unit 6 of the relay computer 1-1-5 multicasts the topic name (topic 1) and the receiving computer IP address (IP address of the relay computer 1-1-5) to the computers in the same cluster. To do. In the lower part of FIG. 13, the publish / subscribe computer notification unit 6 of the computer 1-1-1 receives the notification from the publish / subscribe computer notification unit 6 of the relay computer 1-1-5 and receives the table 7T. A state in which the IP address of the relay computer 1-1-5 is registered in the computer column is shown.

(1) FIG. 14 shows how topic 1 data is distributed. The topic transmitting unit 8-1-1-1 serving as a transmission computer transmits the data of topic 1 toward “multicast IP address of topic 1: port number” in the table 7 T. When the topic receiving unit 9 of the relay computer 1-1-5 receives the data of the topic 1 data, the topic receiving unit 9 refers to its own table 7T, determines that it is the receiving computer of the topic 1, and receives the topic 1 data. It is passed to the topic transfer unit 12. Upon receiving the topic 1 data, the topic transfer unit 12 refers to the table 11T and transmits the topic 1 data toward “multicast IP address of topic 1: port number”.
(2) The transfer topic receiving unit 13 of the relay computer 1-2-5 of the computer raster 3-2 determines that its relay computer is the receiving computer from the table 11T, and receives topic 1 data. The transfer topic receiving unit 13 passes the received topic 1 data to the topic transmitting unit 8. The topic transmission unit 8 transmits the data of topic 1 toward “multicast IP address: port number” registered in the record of topic 1 in the table 7T.
(3) The topic receiving unit 9 of the receiving computer 1-2-2 in the same cluster receives topic 1 data from the table 11T because its own computer is the receiving computer.

  Next, an example of the overall operation of the system when the topic publishing process and the topic subscription process are activated in the publish-subscribe data communication system of the first embodiment will be described with reference to FIGS.

With reference to FIG. 15, the operation from the publication process activation in the computer 1-1-1 to the publication process activation notification being transmitted to the other computers in the cluster 3-1 will be described.
It is assumed that a transmission process for transmitting topic 1 is started on the computer 1-1-1 belonging to the computer cluster 3-1. The publication / subscription computer notification unit 6 on the computer 1-1-1 detects that the process of transmitting the topic 1 has started (publishing process in S3), and acquires the process start detection time. Then, the publication / subscription computer notification unit 6 of the computer 1-1-1 refers to the publication / subscription computer management unit 7 on its own computer, and whether the IP multicast address and port number for transmitting the topic 1 are registered. A check is made (S4).
If not registered (NO in S4), the publication / subscription computer notifying unit 6 of the computer 1-1-1 determines the IP multicast address and port number, determines the IP multicast address, port number, process activation detection time, self The computer's IP address, topic name, and its own computer's IP address (transmission computer address) are registered in the publishing / subscribing computer management section 7 on its own computer (S5).

  If already registered (YES in S4), the publishing / subscription computer notification unit 6 compares the process activation detection time with the time registered in the publishing / subscription computer management unit 7 (S6), and has registered it. If the time is newer, delete the registered data, determine the IP multicast address and port number, and change the IP multicast address, port number, and process activation detection time indicated in the publish / subscribe computer management unit 7 (S7). Then, the publishing / subscription computer notification unit 6 sets the communication socket so that the topic transmission unit 8 can transmit data with the IP multicast address and port number newly registered or updated with the publishing / purchase computer management unit 7. Perform (S8). The publishing / subscription computer notifying unit 6 newly registers a topic in the publishing / purchase computer management unit 7 or changes the IP multicast address of the topic indicated in the publishing / purchase computer management unit 7. An IP multicast address for transmitting / receiving topic data, a port number, a process activation detection time, and an IP address of a computer on which a publishing process has been activated are notified to the publishing / subscribing computer notification unit 6 of all computers in the same computer cluster ( S10). If the IP multicast address is not changed, the IP address of the own computer is registered in the publishing / purchase computer management unit 7 in the topic name record (S9), and the topic name and the computer of which the publishing process is started are registered. The IP address (in this example, the IP address of the computer 1-1-1 that is the self) is notified to the publication / subscription computer notification unit 6 of all computers in the same computer cluster (S10). In this case, the notification to all computers in the same computer cluster may be notified by IP multicast or broadcast, for example. It is assumed that the IP multicast address and port number for IP multicast are given in advance.

(Publishing other computers)
The publication / subscription computer notification unit 6 that has received the publication process activation notification from the publication / subscription computer notification unit 6 of the computer 1-1-1-1 that has started the publication process,
(1) IP address of the computer that sends Topic 1,
(2) IP multicast address,
(3) When the information regarding the port number is received, each is registered in the publishing / subscription computer management unit 7 (S16). When there is a change in the IP multicast address registered in the publishing / subscription computer management unit 7 and the topic publishing process is operating on the own computer, the topic 1 can be transmitted with the received IP multicast address and port number. The topic transmitting unit 8 is instructed (S19). The topic transmission unit 8 changes the settings of the IP multicast address and the port number so that topic data can be transmitted.

  In the case of the publish / subscribe computer notification unit 6 on the data relay computer 1-1-5, the topic name transmitted in the computer cluster and the process activation detection time are further passed to the transfer topic notification unit 10. FIG. 15 shows the operation up to this point.

(Precondition 2)
In the first embodiment, the same multicast IP address and the same port number are allocated to the same topic in the same computer cluster. “Same topic” means topics having the same “topic name”. The topic name includes information that can widely identify the topic in addition to the name of the topic. Further, the topic and the multicast address are not associated with each other, and each topic publishing process is dynamically determined by the publishing / subscribing computer management unit 7 of the computer that has started the process. For this reason, when the process of publishing the same topic has already been started on the computers in the computer cluster, the multicast IP address and port number have already been determined and registered in the publishing / subscription computer management unit 7. For this reason, the data of the transmission process that is newly started after a delay is transmitted using the registered IP multicast address.

  Next, a case where the subscription process is activated will be described with reference to FIG.

(Subscription process startup computer 1-1-2)
It is assumed that a subscription process that desires to subscribe to Topic 1 is started on the computer 1-1-2 belonging to the computer cluster 3-1. When the topic 1 subscription process is activated, the publication / subscription computer notification unit 6 on the computer 1-1-2 detects the activation, and the publication / subscription computer notification unit 6 of all computers in the same computer cluster 3-1 receives the activation process. , Notify the activation (notify the subscription process activation notification). The subscription process activation notification includes the topic name and the IP address of the receiving computer (S13 described later).

(Other computers in cluster 3-1)
When the publication / subscription computer notification unit 6 of another computer in the cluster 3-1 receives the subscription process activation notification,
(1) Topic name and
(2) The IP address of the receiving computer (computer 1-1-2 in this example)
Register in the publishing / subscribing computer management section 7 on its own computer.
If a publishing process or subscription process for the same topic has already been started on a computer in the same cluster and a topic name is registered, the topic name of the publishing / subscribing computer management unit 7 is registered. The notified IP address is registered in the receiving computer IP address column of the row (record).

(Data relay computer 1-1-5)
Then, the publication / subscription computer notification unit 6 on the relay computer 1-1-5 of the computer cluster 3-1 notifies the transfer topic notification unit 10 of the activation of the topic 1 subscription process (S12). FIG. 16 shows the operation so far.

(Socket setting of topic receiving unit 9 of receiving computer 1-1-2)
Next, with reference to FIG. 17, the operation of the reception computer 1-1-2 that has started the subscription process will be described. The publish / subscribe computer notification unit 6 of the reception computer 1-1-2 executes the following processing. After the computer identifier (transmitter IP address), the port number, and the IP multicast address of the transmission process are registered in the publishing / subscription computer management unit 7 on the computer 1-1-2 in which the subscription process is started,
(A) When the reception process of the same topic is started on the own computer (S13),
Or
(B) When the reception process of topic 1 is started on the own computer 1-1-2 and registered in the publishing / subscription computer management unit 7, the transmission process of the same topic is started on another computer.
The publish / subscribe computer notification unit 6 of the computer 1-1-2 receives the “process activation notification” by the above-described method, and can receive data (reception process activation) with the designated IP multicast address and port number. It instructs the topic receiving unit 9 to set a socket. Upon receiving this instruction, the topic receiving unit 9 of the computer 1-1-2 creates a socket for receiving data on the topic 1 with reference to the publication / subscription computer management unit 7. That is, the topic receiving unit 9 sets a socket so that data can be received by the IP multicast address registered in the publishing / subscription computer management unit 7. As a result, the reception process can receive topic data (FIG. 6) related to topic 1 via topic receiving unit 9 of computer 1-1-2. FIG. 17 shows this operation.

  In addition, since the multicast IP address is registered in the publishing / subscribing computer management unit 7 of each computer, the reception process started in the computer cluster 3 after this operation creates a socket and sends it to the publishing / subscription computer management unit 7. Data can be received by setting the specified multicast address to the socket.

  Next, the operation of the data relay computer 1-1-5 will be described with reference to FIG. 15, the publication / subscription computer notification unit 6 of the relay computer 5-1 (computer 1-1-5) of the computer cluster 3-1 publishes a process start notification for publishing topic 1 in the computer cluster 3-1. Is received from the publication / subscription computer notification unit 6 of the computer 1-1-1, and the received process activation notification is passed to the transfer topic notification unit 10 (S12). Whether the topic name of the content, the IP multicast address for transmitting the topic to the relay computer of another computer cluster, the port number, and the process activation detection time are registered in the transfer topic management unit 11 is checked. If registered, the time registered in the transfer topic management unit 11 is compared with the time in the notification. If the notified process activation detection time is earlier, the topic 1 row of the transfer topic management unit 11 is updated. The IP multicast address, port number, and process activation detection time are changed to information notified from the computer 1-1-1. If the notified process start detection time is newer, it is left as it is. Then, the transfer topic notification unit 10 transfers all data relay computers (computer 1-2-5, computer 1-3-5) connected to the network (network 2-4) connecting the computer clusters. The topic notification unit 10 indicates that the process of publishing topic 1 has started, the topic name, the IP multicast address to which the topic is transmitted (only when changed), the port number (only when changed), the process start detection time (only when changed) ), And the IP address of the computer 1-1-5. Also in this case, the notification to all data relay computers may be notified by broadcast IP multicast, for example, and it is assumed that the IP multicast address and port number for IP multicast are given in advance.

  The transfer topic notification unit 10 of another data relay computer that has received the publication process activation notification from the data relay computer 1-1-5 receives the notified information (topic name, IP address, IP multicast address (only when changed). The port number (only when changed) and the process activation detection time (only when changed) are registered in the transfer topic management unit 11. When the IP multicast address is changed, the corresponding column of the line in which the same topic name is registered in the transfer topic management unit 11 is changed (the publication process is started above).

  After the topic 1 publication process is registered in the transfer topic management unit 11, the topic 1 subscription process is registered in the data relay computer publication / subscription computer management unit 7, or the topic 1 subscription process is published in the data relay computer. When the topic 1 publication process is registered in the transfer topic management unit 11 after being registered in the subscription computer management unit 7, the transfer topic notification unit 10 displays the data relay computer of the computer cluster in which the topic 1 publication process operates. The topic subscription request notification is transmitted to the transfer topic notification unit 10.

  FIG. 18 is a diagram showing the operation so far from FIG.

  The socket setting in the transfer topic receiving unit 13 will be described with reference to FIG. When the topic 1 subscription process operates in the same computer cluster, the transfer topic reception unit 13 of the data relay computer receives data at the IP multicast address and port number indicated in the transfer topic management unit 11 by the operation of FIG. Set up communication sockets so that you can. FIG. 19 shows this operation.

(Receiving publishing process start notifications from other clusters)
Next, a communication operation between relay computers will be described with reference to FIG. The transfer topic notification unit 10 of the relay computer (computer 1-2-5, 1-3-5 in this example) that has received the publication process start notification from the transfer topic notification unit 10 on the relay computer 1-1-5 The publishing / subscription computer notification unit 6 is instructed to notify the publishing / subscription computer notification unit 6 in the same cluster that one publishing process has started. Upon receiving the instruction, the publishing / subscription computer notifying unit 6 of the relay computer determines an IP multicast address and a port number for multicast transmission of the topic 1. Then, the publishing / subscribing computer notifying unit 6 of the relay computer that has received the instruction refers to the publishing / subscribing computer management unit 7 and determines whether the IP multicast address, port number, and process activation detection time of topic 1 are registered. Investigate. If registered, the publishing / subscribing computer notification unit 6 of the relay computer that has received the instruction receives the process activation detection time received from the relay computer 1-1-5 and the process registered in the publishing / subscribing computer management unit 7. If the process start detection time received from the relay computer 1-1-5 is old, the IP multicast address, port number, process start detection time, and source IP address of this notification determined by the relay computer are compared. Is registered in the corresponding column of the topic 1 row of the publishing / subscribing computer management unit 7, and this information is notified to the publishing / subscribing computer notification unit 6 of all the computers in the same computer cluster.

  The publishing / subscribing computer notifying unit 6 of the relay computer that has received the instruction notifies the publishing / subscribing computer notifying all the computers in the same computer cluster only the topic name and the source IP address of this notification if the process activation detection time is newer. Notification to the unit 6. Then, the publish / subscribe computer notification unit 6 of the other computer in the same cluster that has received the notification of the topic name, the source IP address, the IP multicast address (only at the time of change), and the port number (only at the time of change) The corresponding column of the computer management unit 7 is changed.

  FIG. 20 shows the operation up to this point.

  Then, when the IP multicast address and port number for receiving the topic of the publishing / subscription computer management unit 7 are changed or newly registered, the topic receiving unit 9 must be running the topic receiving process on its own computer. For example, a socket is created with a specified port number (in the case of a new topic), and an IP multicast address is set so that the topic can be received. This operation is the same as FIG.

  Next, a topic transmission operation will be described with reference to FIG. When the topic transmission unit 8 of the computer 1-1-1 transmits the data of the topic 1 by the operation shown in FIGS. 15 to 20, the topic data is also transmitted to the topic 1 in other computers as well as the computer 1-1-2. Since there is a process that wants to subscribe to (Computer 1-2-2), it also reaches the computer 1-1-5 which is a data relay computer. The topic receiving unit 9 of the computer 1-1-2 and the computer 1-1-5 refers to the publishing / subscribing computer managing unit 7, checks whether the data reception process is activated on its own computer, and is activated. If so, the data is passed to the data receiving process. Since the publishing / subscribing computer management unit 7 of the computer 1-1-5 is registered in the transfer topic management unit 11 as the sending computer of its own computer, the topic receiving unit 9 recognizes that the topic data should be transferred. The topic transfer unit 12 is instructed to transfer the topic. The topic transfer unit 12 on the computer 1-1-5 refers to the transfer topic management unit 11 and multicasts data to the designated port of the designated multicast IP address.

(Other relay computer 1-2-5)
Since the data relay computer 1-2-5 of the computer cluster 3-2 in which the process (computer 1-2-2) that wants to subscribe to the topic 1 operates has entered the multicast group of the topic 1, the computer The data of Topic 1 transmitted by 1-1-5 can be received. Then, the transfer topic receiving unit 13 of the computer 1-2-5 that has received the data from the computer 1-1-5 refers to the transfer topic management unit 11 that the host is the receiving computer of the topic. And pass the data to the topic transmitter 8. The topic transmission unit 8 of the computer 1-2-5 transmits data to the multicast IP address and port number indicated in the publishing / subscription computer management unit 7.

(Computer 1-2-2)
Since the computer 1-2-2 has joined the multicast group set by the topic transmission unit 8 on the data relay computer 1-2-5, the data arrives. Thereafter, the topic receiving unit 9 of the computer 1-2-2 receives the data and passes it to the application. This operation is shown in FIG.

  Next, an example of individual processing procedures of the publishing / subscription computer notification unit 6, the topic transmission unit 8, the topic reception unit 9, the transfer topic notification unit 10, the topic transfer unit 12, and the transfer topic reception unit 13 according to the first embodiment. Will be described with reference to FIGS.

  FIG. 22 is a flowchart showing an operation procedure of the publication / subscription computer notifying unit 6 according to the first embodiment.

When the activation of the transmission process or the reception process is detected from the publication / subscription computer notification unit 6 of the other computer in step S1, or the activation of the transmission process or the reception process on the own computer is detected, the process proceeds to step S2.
In step S2, the contents of the notification and the transmission source of the notification are investigated. If the notification is from the publication / subscription computer notification unit of another computer, the process proceeds to step S17. If the process activation of the own computer is detected, the process proceeds to step S3. If the request is an end request, the process ends. The termination request may be a signal from the operating system, for example.
In step S3, it is investigated whether the activation process is a topic publishing process or a topic subscription process. If it is a topic publishing process, the process proceeds to step S4. If it is a topic subscription process, the process proceeds to S13.

(When the publishing process starts on your computer)
In step S4, it is checked whether or not the IP multicast address of the topic published by the activated process has been registered in the publishing / subscription computer management unit 7. If not registered, the process proceeds to step S5. If registered, the process proceeds to step S6.
In step S5, the IP multicast address and port number for transmitting the topic are determined, the information, the IP address of the own computer, and the process start time are registered in the publishing / subscription computer management unit 7, and the process proceeds to step S8.
In step S6, the process activation detection time of the topic publishing process registered in the publishing / subscription computer management unit 7 is compared with the activation time of the topic publishing process activated on the own computer, and the publishing / subscription computer management unit 7 If the registered activation detection time T (registration) is newer, the process proceeds to step S7, and if the activation detection time T (registration) is older, the process proceeds to step S9.
In step S7, the publishing / subscription computer notifying unit 6 determines a multicast IP address and a port number for transmitting a topic, and a row in which a topic published by the activation process of the publishing / subscribing computer management unit 7 is registered ( Record), the IP multicast address / port number field is changed to the content of the determination, the process activation detection time is changed to the activation detection time of the publishing process activated on the own computer, and the transmission source computer IP address field is changed to The IP address of the own computer is registered, and the process proceeds to step S8. Thus, in step S7, the IP multicast address, port number, and publication process activation detection time are updated.
In step S8, the topic transmission unit 8 of the own computer is instructed to transmit the topic using the IP multicast address / port number newly registered or updated, and the process proceeds to step S10.

In step S9,
Since activation detection time T (registration) <activation detection time T (notification),
Only the IP address of the own computer is registered in the IP address column of the transmission source computer in the topic name line transmitted by the activation process of the publish / subscribe computer management unit 7, and the process proceeds to step S10.

  In step S10, the publishing / subscribing computer notification unit 6 of the computer (computer 1-1-1 in this example) that has started the publishing process has the activation process executed by the publishing / subscription computer notification unit 6 of all computers in the same computer cluster. The topic name to be published and the content changed by the publish / subscribe computer management unit 7 of the own computer or the newly registered content are notified, and the process proceeds to step S11.

In step S11, it is checked whether or not the own computer is the data relay computer 5. If the computer is the data relay computer 5, the process proceeds to step S12. Otherwise, the process returns to step S1.
In step S12, the notification contents are transferred to the transfer topic notification unit 10, and the transfer topic management unit 11 is instructed to register a topic name, an IP multicast address, and the like. The topic name published by the newly activated topic publishing process and the start time of the publishing process of the topic registered in the publishing / subscription computer management unit 7 are notified, and the process returns to step S1.

(When the subscription process starts on your computer)
In step S13, the publish / subscribe computer notification unit 6 of all computers in the same computer cluster is notified of the topic name subscribed by the activation process and the IP address of the computer activated in the topic subscription process, and the process proceeds to step S14.
In step S14, if the IP multicast address of the topic desired to be subscribed has already been registered in the publishing / subscription management unit 7, and the IP address of the own computer has not been registered in the receiving computer IP address column of the topic desired to be subscribed, Proceed to step S15,
In step S15, the topic receiving unit 9 is instructed to receive topic data with the IP multicast address, and the process proceeds to step S20.

(For notifications from other computers)
In step S17, the publishing / subscription computer notification unit 6 investigates the notification content and determines whether the content is a publishing process activation notification.
If it is activated, the process proceeds to S19. If it is not activated, the process proceeds to S18.
In step S18, the publishing / subscription computer notifying unit 6 registers the received content in the publishing / subscribing computer management unit 7, and proceeds to S11.
In step S 19, it is determined whether the IP multicast address of the notification topic has been registered in the publishing / subscription computer management unit 7. If registered, the process proceeds to S20, and if not registered, the process proceeds to S21b.

  In S21b, the IP multicast address and port number are determined and registered in the publishing / subscription computer management unit 7, and the process proceeds to S22.

In S20, the registered process activation detection time is compared with the notified process activation detection time.
In S20, if the registered time is not larger (older or the same time), the process proceeds to S21a. If the registered time is larger (newer), the process proceeds to S23, and the IP address of the startup computer is published / subscribed. Register in the management unit 7.

  In step S21a, the IP multicast address, port number, etc. are changed and registered in the publication / subscription computer management unit 7 together with the IP address of the activation computer.

In step S22, the topic transmission unit 8 is instructed to change the setting so that data is transmitted using the changed IP multicast address in preparation for the case where the topic publishing process operates on the own computer, and the process proceeds to step S11.
In step 24, it is checked whether the topic reception process is operating on the local computer. If it is operating, the process proceeds to step S21, and if not, the process proceeds to step S11.
In step S25, the topic receiving unit 9 is instructed to receive topic data at the designated IP multicast address, and the process proceeds to step S11.

  The operations in steps S1 to S19 are repeated until an end request is received in step S1.

  Next, an example of the operation procedure of the topic transmission unit 8 will be described with reference to the flowchart of FIG.

Waiting for data reception in step S31, and receiving data, the process proceeds to step S32,
In step S32, the type of received data is checked. If it is an end request, the process ends. If it is topic data transmitted by the topic publishing process, the process proceeds to step S33, and publish / subscribe in steps S6, S8, and S19. If it is an instruction from the computer notification unit 6, the process proceeds to step S34. Here, the termination request may be a signal from the operating system, for example.
In step S33, data is transmitted, and the process returns to step S31.
In step S34, the publish / subscribe computer management unit 7 is referred to obtain the IP multicast address and port number, set the socket so that data can be transmitted to the IP multicast address and port number, and the process returns to step S31.
The processes in steps S31 to S34 are repeated until an end request is received in step S31.

  Next, an example of the operation procedure of the topic receiving unit 9 will be described using the flowchart of FIG.

In step S41, data reception is waited. When data is received, the process proceeds to step S42.
In step S42, it is checked whether the content of the data is topic data, a request for setting a multicast IP address and port number from the publishing / subscription computer notification unit 6 or the transfer topic notification unit 10, or a termination request. If it ’s the topic you ’ve submitted,
Proceeding to step S43, if it is a request for setting a multicast IP address and port number, proceeding to step S46,
In step S43, the publishing / subscription computer management unit 7 is referenced to check whether the topic data is to be received by the own computer. If the topic data is to be received by the own computer, the process proceeds to step S44, and the own computer is to receive the topic data. If it is not topic data, the process proceeds to step S45.
In step S44, data is passed to the reception process, and the process proceeds to step S45.
In step S45, whether or not the own computer is a data relay computer and data to be transferred to another computer cluster is checked by referring to the transfer topic management unit 11. If the data is to be transferred, the process proceeds to step S46. ,
In step S46, the data is transferred to the topic transfer unit 12.
Steps S41 to S46 are repeated until an end request is received in step S41.

  Next, an example of the operation procedure of the transfer topic notification unit 10 will be described with reference to the flowchart of FIG.

In step S51, the process waits for data reception. When data is received, the process proceeds to step S52.
In step S52, the type of data is investigated, and if it is a notification that the publish / subscribe computer management unit 7 of the own computer transmits in step S12, the process proceeds to step S53, and the transfer topic notification unit 10 of another data relay computer starts. If it is a topic subscription request notification or publication notification, the process proceeds to step S59, and if it is an end request, the process ends. The termination request may be a signal from the operating system, for example.
In step S53, the type of the activated process of the notification content transmitted in S12 is checked. If the activated process is a topic subscription process, the process proceeds to step S54. If the activated process is a topic publishing process, the process proceeds to step S59.
In step S54, the IP address of the own host is registered in the reception computer IP address of the reception topic row of the transfer topic management unit 11 (if the topic name is not registered, the topic name is also registered), and the process proceeds to step S55.
In step S55, if the topic that the topic subscription process wishes to subscribe to, and the IP multicast address and port number are registered in the forwarding topic management unit 11, the process proceeds to step S56, and if not registered, the process returns to step S51.
In step S56, the transfer topic notification unit 10 of the relay computer of the computer cluster in which the topic publishing process operates is notified that the topic subscription process has started, and the process proceeds to step S57.
In step S57, the transfer topic receiving unit 13 is instructed to receive topic data at the IP multicast address and port number indicated in the corresponding topic row of the transfer topic managing unit 11,
In step S58, the publish / subscribe computer notification unit 6 of the own computer is notified that the transmission process for publishing the topic on the own computer has started, and the process returns to step S51.
In step S59, the forwarding topic management unit 11 is referred to, and it is checked whether or not the IP multicast address of the notified topic is registered. If not registered, the process proceeds to step S62. If registered, the process proceeds to step S60.

In step S60, the registration time of the IP multicast address of the topic and the time notified from the publishing / subscription computer management unit 7 are checked. If the time notified from the publishing / subscription computer management unit 7 is older, step S, new If so, proceed to step S61.
In step S61, the IP multicast address / port number column of the topic is left as it is, only the IP address of the own computer is registered in the transmission computer IP address column, and the process proceeds to step S64.
In step S62, the transfer topic notification unit 10 determines an IP multicast address and a port number for transmitting topic data to other computer clusters, registers them in the transfer topic management unit 11, and proceeds to step S63.
If the IP address of the process for subscribing to the topic distributed by the publishing process is already registered in step S63, the process proceeds to step S64.
In step S64, the topic transfer unit 12 is instructed to transmit the topic using the IP multicast address and port number indicated in the transfer topic management unit 11, and the process proceeds to step S65.
In step S65, the transfer topic notification unit 10 of the data relay computer connected to the network connecting the computer clusters is notified of the contents registered in the transfer topic management unit 11 in steps S61 and S62, and the process returns to step S51.

  In step S66, it is determined whether it is a publication process start notification. If it is not a publishing process activation notification, the process proceeds to step S67, and the notification content is transferred, registered in the transfer topic management unit 11, and the process proceeds to S68. In step S68, it is determined whether the publishing process has been activated in the cluster to which it belongs, and if completed, the process proceeds to step S64, and if not activated, the process returns to step S51.

  If YES in step S66, the process proceeds to step S69. In step S69, it is determined whether the IP multicast address has been registered. If not registered, the process proceeds to step S75, where the IP multicast address or the like is registered in the transfer topic management unit, and the process proceeds to step S71.

  If it has already been registered in step S69, the process proceeds to S70, where the registration time of the IP multicast address is compared with the time when the publication process activation notification is notified. If the registration time is not shorter (the registration time is older (smaller) or the same time), the process proceeds to step S75. In step S75, the notified IP multicast address and the like are registered in the transfer topic management unit. If the registration time is larger, the process proceeds to step S71.

  If the notified time is smaller in step S70, the process proceeds to step S71.

  In step SS71, the transfer topic management unit 11 is referred to. If the own computer is registered as a computer in which the subscription process of the same topic operates, the process proceeds to step S72, and if not registered, the process returns to step S51.

In step S72, the computer in which the topic publishing process has been operated is notified of the start of the subscription process and the IP address of its own host, and the process proceeds to step S73.
In step 73, the transfer topic receiving unit 13 is instructed to receive data at the designated IP multicast address and port number, and the process proceeds to step S74.
In step S74, the publishing / subscription computer notification unit 6 of the own computer is notified that the transmission process for publishing the topic on the own computer has started, and the process returns to step S51.
The operations in steps S51 to S74 are repeated until an end request is received in step S51.

  Next, an example of the operation procedure of the topic transfer unit 12 will be described using the flowchart of FIG.

In step S81, it waits for the reception of an event from the outside. When an event is received, the process proceeds to step S73.
In step S82, the event type is investigated. If the event type is reception of topic data, the process proceeds to step S83. If it is a notification from the transfer topic management unit 11, the process proceeds to step S85. If it is a termination request, the process is terminated. The termination request may be a signal from the operating system, for example.
In step 83, it is confirmed that the topic name of the data is registered in the transfer topic management unit 11, and if registered,
In step S84, data is transmitted to the IP multicast address and port number of the line in which the topic of the transfer topic management unit 11 is registered. If not registered, the process returns to step S81 as an error.
In step S85, the IP multicast address and port number received from the transfer topic notification unit 10 are set in the communication socket, and the process returns to step S81.
Steps S81 to 85 are repeated until an end request is received in step S81.

  Next, an example of the processing procedure of the transfer topic receiving unit 13 will be described with reference to the flowchart of FIG.

In step S91, it waits for the reception of an event. When an event is received, the process proceeds to step S82.
In step S92, if the event type is topic data reception, the process proceeds to step S93. If it is a message notification from the topic transfer unit 12, the process proceeds to step S95. The termination request may be a signal from the operating system, for example.
In step S93, it is confirmed that the topic name of the data is registered in the transfer topic management unit 11 and the own host is registered as a receiving host. If registered, the process proceeds to step S94 and must be registered. Then, the process returns to step S91.
In step S94, the data is passed to the topic receiving unit, and the process returns to step S91.
In step S95, the socket setting is changed so that data can be received at the designated IP multicast address, and the process returns to step S91.

  As described above, in the first embodiment, the transfer data management unit exchanges topics published on each computer cluster, and when there is a request for topic subscription on a computer in a different computer cluster, By delivering the data via the transfer unit 12, the process can perform data communication in a publish-subscribe format between different computer clusters without being aware of the difference between the computer clusters.

  In the first embodiment, the data relay computer enters the IP multicast group only when there is a request to receive a topic in the computer cluster to which the data relay computer belongs. In comparison, the load on the data relay computer can be reduced.

  In the first embodiment, when a plurality of data publishing processes that transmit the same topic are started on different computers, the IP multicast address of the process that is started earliest is adopted. Even if the correspondence of the multicast address is not determined, the correspondence between the topic and the IP multicast address is dynamically and uniquely determined.

Embodiment 2. FIG.
In the first embodiment, a data relay computer of a computer cluster in which a data publishing process operates is used as a data transmission method in a case where a user wishes to subscribe to topic data transmitted on another computer cluster. A computer that joins an IP multicast group for receiving topics and receives topic data, and that data relay computer transmits data to a data relay computer of a computer cluster in which the data subscription process operates, and the data subscription process operates Has been described as a method in which the data relay computer of the computer cluster in which the data subscription process operates is transmitted to the IP multicast group.

  In the first embodiment, the data relay computer of each computer cluster joins the IP multicast group only when transmitting / receiving topic data from other computer clusters, thereby receiving all data and transferring it as necessary. It is characterized by the fact that the load on the computer can be reduced compared to the case of doing so.

  In the second embodiment, the data relay computer does not need to belong to the IP multicast group of the topic that has been distributed or subscribed because the process that previously subscribed to the topic or the process that has distributed the topic has stopped. Will be described in the case of

  The configuration of the publish-subscribe data communication system in the second embodiment is the same as that in the first embodiment, and a description thereof will be omitted.

  The publication / subscription computer notification unit 6 and the transmission topic notification unit 10 in the second embodiment will be described. Since the functions of the publishing / subscription computer management unit 7, the topic transmission unit 8, the topic reception unit 9, the transfer topic management unit 11, the topic transfer unit 12, and the transfer topic reception unit 13 are the same as those in the first embodiment, description thereof is omitted. To do.

  The publishing / subscribing computer notifying unit 6 notifies the information such as the topic name to all the computers in the same computer cluster when the process of publishing and subscribing to a topic stops on the computer or when publishing and subscribing is stopped. At the same time, it receives the notification and updates the information in the publishing / subscription computer management unit 7.

  The transmission topic notifying unit 10 sends to all data relay computers connected to the network connecting the computer cluster when the process of distributing the topic in the own computer cluster stops or when the topic distribution of the process stops. The topic name is notified, the notification is received, and the information of the transfer topic management unit 11 is updated.

  Next, when the publish-subscribe data communication method in the second embodiment is applied, the topic publishing process and the topic subscription process are started, and communication is started by the method of the first embodiment and then stopped. An example of the overall operation of the system will be described with reference to FIGS. 28 to 31 using the system configuration of FIG.

  This will be described with reference to FIG. When the process of transmitting topic 1 on the computer 1-1-1 belonging to the computer cluster 3-1 is started and stopped, or when the delivery of topic 1 is stopped, the publishing / subscribing computer of the computer 1-1-1 The notification unit 6 detects the stop of delivery of the topic 1 and notifies all publication / subscription computer notification units 6 in the computer cluster that the topic name and topic publication will be stopped. Also, the topic transmission unit 8 is instructed to close the socket, and the topic transmission unit 8 closes the socket.

When the publish / subscribe computer notification unit 6 on each computer receives the publish stop notification for topic 1, the publish / subscribe computer management unit 7 starts from the IP address column of the transmission computer IP address column of the topic for which publishing has been stopped. Delete the number and the IP address of the computer.
The publish / subscribe computer notification unit 6 on the data relay computer passes the received notification content to the transfer topic notification unit 10. FIG. 28 shows the operation so far.

  This will be described with reference to FIG. In addition, when a process that wants to subscribe to topic 1 stops in computer 1-1-2 belonging to computer cluster 3-1, or when the process stops subscribing to topic 1, publication of computer 1-1-2 The subscription computer notification unit 6 detects the suspension of topic 1 subscription, notifies all publishing / subscription computer notification units 6 in the computer cluster 3-1 that the topic name and subscription will be stopped, and the topic reception unit 9 Instructs the socket to close. Upon receiving the instruction, the topic receiving unit 9 closes the socket.

  When the publish / subscribe computer notification unit 6 on each computer receives the subscription stop notification for topic 1, the publish / subscribe computer management unit 7 selects the IP address of the computer from the received computer IP address column of the topic for which subscription has been stopped. Is deleted. When there is no longer any process that wants to subscribe to the topic, the publish / subscribe computer notification unit 6 of the data relay computer passes the notification content to the transfer topic notification unit 10. FIG. 29 shows the operation so far.

  This will be described with reference to FIG. After the operation of FIG. 28, the transfer topic notification unit 10 deletes the IP address of the computer 1-1-5 in the entry of the transmission computer IP address in the topic name line in the transfer topic management unit 11 that has stopped distribution. To do. Then, the topic is sent to the transfer topic notification unit 10 of all the data relay computers (computer 1-2-5, computer 1-3-5) connected to the network (network 2-4) connecting the computer clusters. Notify that the publication of 1 has been stopped. Also in this case, it is conceivable that the notification to all the data relay computers is notified by, for example, a broadcast IP multicast address, and it is assumed that the IP multicast address and the port number when using the IP multicast address are determined in advance. The transfer topic notification unit 10 of the other data relay computer that has received the notification from the data relay computer 1-1-5 includes the computer 1 in the transfer computer column of the topic line in the transfer topic management unit 11 that has stopped distribution. -1-5 IP address is deleted. When there is no relay computer that transmits the topic by deleting the IP address of the computer 1-1-5, the transfer topic notification unit 10 instructs the transfer topic reception unit 13 to leave the multicast group. Then, the transfer topic receiving unit 13 closes the socket used to receive the topic. FIG. 30 shows the operation up to this point.

  This will be described with reference to FIG. 29, when there are no more computers that subscribe to topic 1 in the computer cluster 3-1, the transfer topic notification unit 10 in the transfer topic management unit 11 in the row of the topic name whose subscription has been stopped. The IP address of the own computer is deleted from the IP address field. If there is a data relay computer of another computer cluster in the transmission computer column of the transfer topic management unit 11, the transfer topic notification unit 10 of that computer is notified of the suspension of topic 1 subscription. Also in this case, it is conceivable that the notification to the data relay computer is notified by, for example, a broadcast or IP multicast address, and the IP multicast address and port number when using the IP multicast address are determined in advance. The transfer topic notification unit 10 of the other data relay computer that has received the topic subscription stop notification from the data relay computer 1-1-5 is the receiving computer IP address column of the topic column in the transfer topic management unit 11 whose subscription has been stopped. To delete the IP address of the computer 1-1-5. FIG. 31 shows the operation so far.

  Next, an example of operations of the publishing / subscription computer management unit 7, the topic transmission unit 8, the topic reception unit 9, the transfer topic management unit 11, the topic transfer unit 12, and the transfer topic reception unit 13 according to the second embodiment will be described. .

  FIG. 32 is a flowchart showing an example of the operation of the publish / subscribe computer management unit 7 in the second embodiment.

In step S101, when a transmission process or reception process stop notification is received from the publication / subscription computer notification unit 6 of another computer, a stop of the transmission process or reception process on the own computer is detected, or a stop request is received, Proceed to step S102
In step S102, the contents of the notification and the transmission source of the notification are investigated. If the notification is from the publish / subscribe computer notification unit 6 of another computer, the process proceeds to step S112, and the process stop notification of the own computer or the publish / subscription change notification If so, the process proceeds to step S103, and if it is an end request, the process ends. The termination request may be a signal from the operating system, for example.
In step S103, it is investigated whether the topic publishing process is suspended (including suspension) or the topic subscription process is suspended (including suspension). If the publication is suspended, the process proceeds to step S104. If the subscription is suspended, the process proceeds to step S109. ,
In step S104, the publishing / subscription computer management unit 7 on the own computer deletes the IP address of the own computer from the transmission computer IP address column of the topic line whose publication has been stopped, and the process proceeds to step S105.
In step S105, the topic name and IP address are notified to all computers in the same computer cluster, and the process proceeds to step S106.
In step S106, the topic transmission unit 8 on the local computer is instructed to close the socket of the IP multicast address that transmits the topic, and the process proceeds to step S107.
In step S107, it is checked whether or not the local computer is a data relay computer. If it is a data relay computer, the process proceeds to step S108; otherwise, the process returns to step S101.
In step S108, the transfer topic notification unit 10 is notified of the name of the topic published or unsubscribed, and the process returns to step S101.
In step S109, the IP address of the own computer is deleted from the received computer IP address column in the row of the topic whose subscription has been stopped in the publish / subscribe computer management unit 7 on the own computer,
In step S110, the publication / subscription computer notification unit 6 of another computer in the same computer cluster is notified of the subscription stop of the reception process of topic 1.

In step S111, it is checked whether or not there is a process that desires to subscribe to the same topic on its own computer. If not, the topic receiving unit 9 is instructed to close the socket. Then, the process proceeds to step S107. If the notification received in step S101 is a notification from the publish / subscribe computer notification unit 6 of another computer, in step S112, the publish / subscribe computer management unit 7 in the row of the topic whose publication / subscription has been stopped, Delete the IP address of the computer that has been published or unsubscribed from the IP address column of the sending computer or the IP address column of the subscription computer, and go to step S113.
In step S113, it is checked whether the notification content is a distribution stop or a subscription stop. If it is a distribution stop, the process proceeds to step S114. If it is a subscription stop, the process proceeds to step S107.
In step S114, it is checked whether there is another process for transmitting the topic. If there is no other process, the process proceeds to step S115. If not, the process proceeds to step S107.
In step S115, the topic receiving unit 9 is instructed to close the socket for receiving the topic, and the process proceeds to step S107.
The operations in steps S101 to S115 are repeated until an end request is received in step S101.

  Next, an example of the operation of the topic transmission unit 8 in the second embodiment is shown in the flowchart of FIG.

In step S121, the reception of data is waited. When data is received, the process proceeds to step S122. If the data content is an end request, the process ends.
In step S122, the contents of the notification are checked. If the socket close instruction is issued from the publishing / subscription computer management unit 7, the process proceeds to step S123.
In step S123, the socket is closed. Steps S121 to S123 are repeated until an end request is received.

  Next, an example of the operation of the topic receiving unit 9 will be described with reference to the flowchart of FIG.

In step S131, the process waits for data reception. When data is received, the process proceeds to step S132.
In step S132, the contents of the received data are checked. If the instruction is a socket close instruction, the process proceeds to step S133, and if it is an end request, the process ends.
In step S133, the socket is closed.
Steps S131 to S133 are repeated until an end request is received in step S131.

  Next, an example of the operation of the transfer topic notification unit 10 will be described with reference to the flowchart of FIG.

In step S141, the system waits for event reception. When an event is received, the process proceeds to step S142.
In step S142, the event transmission source is investigated. If it is a notification from the own computer, the process proceeds to step S143. If it is a notification from another computer, the process proceeds to step S150.
In step S143, it is checked whether the notification content is the topic subscription process subscription stop or topic delivery process delivery stop. If the topic delivery process delivery stop, the process proceeds to step S144. If the topic subscription process subscription stop, The process proceeds to step S146.
In step S144, it is checked whether or not the topic is registered in the transfer topic management unit 11, and there is a process for distributing the same topic as the notified topic in the same computer cluster. If there is, the process returns to step S141. , Proceed to step S145
In step S145, the publishing / subscription computer notifying unit 6 is instructed to close the socket of the topic receiving unit 9, and the process proceeds to step S146.
In step S146, the topic transfer unit 12 is instructed to close the socket, and the process returns to step S141.
In step S147, it is checked whether the topic is registered in the transfer topic management unit 11 and there is a process for receiving the same topic in the computer cluster. If not, the process proceeds to step S148, and if there is, the process returns to step S141. . In step S148, the transfer topic receiving unit 13 is instructed to close the socket for receiving the topic, and the process proceeds to step S149.
In step S149, the publishing / subscription computer notifying unit 6 is instructed to close the socket for performing IP multicast communication for transferring the topic in the topic transmitting unit 8, and the process returns to step S141.
In step S150, it is checked whether the notification content is topic distribution stop or topic subscription stop. If the topic distribution is stopped, the process proceeds to step S151. If the topic subscription is stopped, the process proceeds to step S154.

In step S151, the transfer topic management unit 11 is referenced to check whether there is a computer that distributes the same topic in another computer cluster. If there is another computer that distributes the same topic, the process returns to step S141. Then, go to step S152,
In step S152, the transfer topic receiving unit 13 is instructed to close the socket for receiving the topic, and the process proceeds to step S153.
In step S153, the publishing / subscription computer notification unit 6 is instructed to close the socket of the topic transmission unit 8 for transferring the topic into the computer cluster, and the process returns to step S141.
In step S154, the transfer topic management unit 11 is referred to, and it is checked whether there is a process that desires to subscribe to the topic in another computer cluster. If there is, the process returns to step S141. If not, the process proceeds to step S155.
In step S155, the topic transfer unit 12 is instructed to close the socket for transferring the topic to another computer cluster, and the process proceeds to step S156.
In step S156, the publishing / subscription computer notification unit 6 is instructed to close the socket of the topic reception unit 9 for receiving the topic in the computer cluster, and the process returns to step S141.
Steps S141 to S156 are repeated until a stop request is received in step S141.

  Next, an example of the operation of the topic transfer unit 12 will be described with reference to the flowchart of FIG.

In step S161, an event notification is awaited. When an event is received, the process proceeds to step S162.
In step S162, the event type is checked, and if it is a notification from the transfer topic notification unit 10, the process proceeds to step S163, and if it is an end request, the process ends.
In step S163, the socket is closed.
Steps S161 to S163 are repeated until an end request is received in step S163.

Next, an example of the operation of the transfer topic receiving unit 13 will be described with reference to the flowchart of FIG.
In step S171, an event notification is awaited. When an event is received, the process proceeds to step S162.
In step S172, the event type is checked, and if it is a notification from the transfer topic notification unit 10, the process proceeds to step S173, and if it is an end request, the process ends.
In step S173, the socket is closed.
Steps S171 to S173 are repeated until an end request is received in step S163.

  As described above, in the second embodiment, when topic data is exchanged between computer clusters, when a process stops publishing or subscribing a topic on a computer cluster, a socket that is no longer needed is closed. By doing so, it becomes possible to make effective use of OS resources.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIGS. 38 and 39. FIG. In the third embodiment, the hardware configuration of the computer 1-1-1, which is a computer, or the relay computer 1-1-5 will be described.
FIG. 38 is a diagram illustrating an example of the external appearance of the computer 1-1-1.
FIG. 39 is a diagram illustrating an example of hardware resources such as the computer 1-1-1.

  In FIG. 38 showing the appearance, the computer includes a system unit 830, a display device 813 having a CRT (Cathode / Ray / Tube) or LCD (liquid crystal) display screen, a keyboard 814 (Key / Board: K / B), a mouse. 815, a compact disk device 818 (CDD: Compact Disk Drive) and other hardware resources are provided, and these are connected by cables and signal lines. The system unit 830 is connected to the network.

  In FIG. 39 showing hardware resources, the computer includes a CPU 810 (Central Processing Unit) for executing a program. The CPU 810 is connected to a ROM (Read Only Memory) 811, a RAM (Random Access Memory) 812, a display device 813, a keyboard 814, a mouse 815, a communication board 816, a CDD 818, and a magnetic disk device 820 via a bus 825. Control hardware devices. Instead of the magnetic disk device 820, a storage device such as an optical disk device or a flash memory may be used.

  The RAM 812 is an example of a volatile memory. Storage media such as the ROM 811, the CDD 818, and the magnetic disk device 820 are examples of nonvolatile memories. These are examples of a “storage device” or a storage unit, a storage unit, and a buffer. The communication board 816, the keyboard 814, and the like are examples of an input unit and an input device. The communication board 816, the display device 813, and the like are examples of an output unit and an output device. The communication board 816 is connected to the network.

  The magnetic disk device 820 stores an operating system 821 (OS), a window system 822, a program group 823, and a file group 824. The programs in the program group 823 are executed by the CPU 810, the operating system 821, and the window system 822.

  The program group 823 stores programs that execute the functions described as “˜units” in the description of the above embodiments. The program is read and executed by the CPU 810.

  In the description of the above embodiment, the file group 824 includes “to determination result”, “to calculation result”, “to extraction result”, “to generation result”, and “to processing result”. The described information, data, signal values, variable values, parameters, and the like are stored as items of “˜file” and “˜database”. The “˜file” and “˜database” are stored in a recording medium such as a disk or a memory. Information, data, signal values, variable values, and parameters stored in a storage medium such as a disk or memory are read out to the main memory or cache memory by the CPU 810 via a read / write circuit, and extracted, searched, referenced, compared, and calculated. Used for CPU operations such as calculation, processing, output, printing, and display. Information, data, signal values, variable values, and parameters are temporarily stored in the main memory, cache memory, and buffer memory during the CPU operations of extraction, search, reference, comparison, operation, calculation, processing, output, printing, and display. Is remembered.

  In the description of the embodiment described above, the data and signal values are the memory of the RAM 812, the compact disk of the CDD 818, the magnetic disk of the magnetic disk device 820, other optical disks, mini disks, and DVDs (Digital Versatile Disk). Or the like. Data and signals are transmitted on-line via the bus 825, signal lines, cables, and other transmission media.

  In the above description of the embodiment, what has been described as “to part” may be “to means”, and “to step”, “to procedure”, and “to processing”. May be. That is, what has been described as “˜unit” may be implemented by software alone, a combination of software and hardware, or a combination of firmware. Firmware and software are stored as programs in a recording medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a DVD. The program is read by the CPU 810 and executed by the CPU 810. That is, the program causes the computer to function as the “˜unit” described above. Alternatively, a computer (computer) is caused to execute the procedures and methods of “to part” described above.

  In the above embodiment, the following distributed computer system has been described.

There are multiple computer clusters configured by connecting computers to the network, and computers with multiple network interface cards in the computer cluster connect to computers with multiple network interface cards in other computer clusters. In a distributed computer system configured by connecting computer clusters to each other,
A publish-subscribe type that has the following components and realizes publish-subscribe data communication between different computer clusters without imposing a high load on a computer connected to a network connecting the computer clusters. Data communication method.
* Publishing / subscribing computer notification unit with the following functions ・ When a process to send or receive a topic is started on the local computer, it notifies all computers in the local computer cluster.
・ When a process start notification is received from the publishing / subscribing computer notification unit of another computer and a process that wishes to transmit or receive data is running on the local computer, to the topic transmission unit or topic reception unit And instructing to perform processing for transmitting and receiving data to and from other computers in the own computer cluster.
・ When the computer running the publishing / subscribing computer notification unit is a computer connected to the network where the computer is connected to the computer cluster, sending from the publishing / subscribing computer notification unit of the computer in the same cluster or a process start notification When received, the transfer topic notification unit is instructed to transmit the reception topic name of the activated reception process or the transmission topic name of the transmission process to the computer connected to the network connected to the computer cluster of another computer cluster. .
・ When the computer running the publication / subscription computer notification unit is a computer connected to a network connecting the computer clusters, a transmission process for receiving a topic transmitted in another computer cluster in the local computer cluster. When is operating, the topic transmitting unit is instructed to distribute the data received by the transfer topic receiving unit within the own computer cluster.
・ If the computer that runs the publish / subscribe computer notification unit is a computer connected to the network that connects the computer clusters, a process that wishes to receive topics sent by the own computer cluster operates in the other computer cluster. The topic receiving unit is instructed to receive a topic transmitted in the same computer cluster so that the topic can be transmitted from the topic transfer unit to another computer cluster.
* Transfer topic notification unit that exists in the computer connected to the network connecting the computer cluster and has the following functions:-Sends the topic name transmitted or received in the own computer cluster to other transfer topic notification units, The topic name transmitted or received in another computer cluster is received from another transfer topic notification unit.
When the process in the local computer cluster wishes to receive the topic transmitted in the other computer cluster, the transfer topic reception unit is instructed to receive the topic.
Instructs the topic transfer unit to transfer a topic when a process in another computer cluster wishes to receive a topic transmitted in the own computer cluster.
* When data that exists in a computer connected to the network that connects the computer clusters and is transmitted in the local computer cluster is required by a process that operates in the other computer cluster, it is directed toward the other computer cluster. Topic transfer unit that transfers topics * Topic transfer unit when a process in the local computer cluster needs a topic that exists in a computer connected to the network that connects the computer cluster and is transmitted by another computer cluster Transfer topic receiving unit that receives data transmitted from * Topic receiving unit that receives a topic transmitted from the topic transmitting unit of the computer in its own cluster * Topic transmitting unit that transmits data to the topic receiving unit of the computer in its own cluster

In the above configuration, publish-subscribe type data communication system characterized by reducing waste of system resources when topic transmission / reception is stopped by adding the following functions to each component element * Notification of publication / subscription computer The section has the following functions in addition to the above functions.
When a process stops sending or receiving a topic in its own computer cluster, it notifies the publication / subscription computer notification unit of all computers in the own computer cluster.
-Topic transmission when a process that wishes to transmit or receive a topic is running on its own computer when a notification of topic transmission stoppage or reception stoppage sent by the publication / subscription computer notification section of another computer is received. Or a topic receiving unit is instructed to perform processing for releasing resources used for topic transmission or reception.
-If the local computer is a computer connected to the network that connects the computer clusters, and if the local computer cluster receives a topic transmission stoppage or reception stop notification, the topic transmission with other computer clusters or The transfer topic notification unit is instructed to perform processing for stopping reception.
-If your computer is a computer connected to the network that connects the computer clusters, a process that wishes to receive topics sent from other computer clusters operates within the computer cluster, and then stops receiving. In this case, the topic transmitting unit is instructed to stop distributing the data received by the transfer topic receiving unit into the local computer cluster.
-If the local computer is a computer connected to the network that connects the computer clusters, after the process that wishes to receive the data transmitted by the local computer cluster operates in another computer cluster, the transmission on the local computer cluster When the process stops transmission, the topic receiving unit is instructed to perform processing for releasing resources used for data reception.
* In addition to the above functions, the transfer topic notification unit has the following functions:-When a process stops in another computer cluster, information on the topic name etc. that the process was transmitting / receiving is notified to other transfer topics. Exchange with the department.
-When the data in the local computer cluster has received the data being transmitted in the other computer cluster, and then the process from the other cluster has stopped sending data, or the process in the local cluster has stopped receiving data The transfer topic receiving unit is instructed to stop receiving the topic that the process has transmitted or received and to release the OS resource.
-When the data being sent in the local computer cluster is being received by a process in the other computer cluster, and then the transmission of the process is stopped in the local cluster, or the process is received in the other computer cluster If stopped, the topic transfer unit is instructed to stop data transfer and release OS resources.
* In addition to the above functions, the topic transfer unit stops data transfer and releases OS resources in response to an instruction from the transfer topic notification unit.
* In addition to the above functions, the transfer topic reception unit stops data reception and releases OS resources in response to an instruction from the transfer topic notification unit.
* In addition to the above functions, the topic receiving unit stops data reception and releases OS resources in response to an instruction from the publication / subscription computer notification unit.
* In addition to the above functions, the topic transmission unit stops data transmission and releases OS resources in response to an instruction from the publication / subscription computer notification unit.

  1-1-1 to 1-3-6 computer, 2-1, 2-2, 2-3, 2-4 network, 3-1, 3-2, 3-3 computer cluster, 4 distributed computer system, 6 Publication / subscription computer notification unit, 7 Publication / subscription computer management unit, 8 topic transmission unit, 9 topic reception unit, 10 transfer topic notification unit, 11 transfer topic management unit, 12 topic transfer unit, 13 transfer topic reception unit.

Claims (5)

In a computer that is connected to the same network as a plurality of other computers and forms a computer cluster together with the other computers,
Topic identification data for identifying a topic, a set of a multicast address and a port number used in communication in the network, a topic transmission process start time indicating a start time of a topic transmission process for transmitting the topic, and the topic A cluster that includes a computer in which the topic indicated by identification data is activated and includes an IP address of a computer that is connected to the network, and includes in-cluster topic management information in which the record for each topic identification data is registered. Internal management department,
When the topic transmission process of the same topic as the topic identification data registered in the topic management information in the cluster is activated in its own computer, the activation time of the topic transmission process that has been activated is detected, and the detected activation time, The topic transmission process start time of the topic identification data registered in the intra-cluster topic management information is compared. If the detected start time is in the past, the same topic identification data as the started topic is stored. The start time when the multicast address and the port number in the record are newly generated and changed based on a predetermined generation rule, and the topic transmission processing start time is detected in the same topic identification data record as the started topic The topic identification data is the same as the activated topic The change in the IP address of the computer connected to the network in the record is added to the IP address in the network of the own computer, and the change content in the record of the topic identification data that is the same as the activated topic is used as the change information. And an intra-cluster notification unit for notifying other computers connected to the network. The in-cluster notification unit
As a result of comparison between the detected activation time and the topic transmission processing activation time of the topic identification data registered in the in-cluster topic management information, if the detected activation time is newer, The IP address of the computer connected to the network in the same record of the topic identification data is changed to add the IP address of the network of the own computer, and the activated topic, the topic identification data, and the own IP 2. The computer according to claim 1, wherein an address is notified to the other computer connected to the network as the change information. The in-cluster notification unit
From the other computers constituting the computer cluster, upon receiving the change information indicating a change of the cluster within the topic management information possessed by the cluster management unit, the content of the change information before Symbol cluster topic management information The computer according to claim 1, which is reflected. The calculator is
A representative computer representing the computer cluster,
The calculator further includes:
By connecting to a representative computer network different from the network, connected to the representative computer network and capable of communicating with other representative computers representing other computer networks,
Topic identification data, a set of multicast address and port number used in communication in the representative computer network, the topic transmission processing start time, and topic data indicated by the topic identification data in communication between the representative computers A representative computer-to-computer management section having topic management information between representative computers in which the record for each topic identification data is registered,
The in-cluster notification unit
Upon detecting the activation time of the activated topic, the topic identification data of the topic related to the detected activation time and the detected activation time are passed to the inter-representative computer notification unit,
The inter-representative computer notification unit
When the topic identification data and the activation time are passed from the intra-cluster notification unit, by referring to the topic management information between representative computers that the representative computer management unit has, the same topic identification data that has been passed If the topic transmission process start time of the topic identification data is registered, the passed start time and the topic transmission process start time are compared, and the passed start time is in the past. In this case, the multicast address and the port number in the same topic identification data record as the passed topic identification data are newly generated and changed based on a predetermined generation rule, and the received topic identification data The topic transmission processing start time in the same topic identification data record is passed Claims as well as changes to the dynamic time, changes in the record of the same the topic identification data and topic identification data passed, and notifies the other representative computer that connects to the representative computer network The computer in any one of 1-3. A plurality of computer clusters configured by connecting a plurality of computers to a network are provided.
In the distributed computer system in which the plurality of computer clusters are connected to each other by connecting each representative computer representing each computer cluster to a representative computer network different from the network,
(1) Computers belonging to the computer cluster are:
When a transmission process that wishes to transmit topic data is started on its own computer, a transmission process start notification indicating the start of the transmission process is transmitted to all other computers in the computer cluster to which the computer belongs,
(2) The representative computer belonging to the same computer cluster as the computer that transmitted the transmission process start notification is:
Upon receipt of the transmission process activation notification, the transmission process activation notification is transmitted to all the other representative computers via the representative computer network.
(3) All the other representative computers that have received the transmission process activation notification are:
The transmission process start notification is transmitted to all computers belonging to the same computer cluster, and (4) computers belonging to the computer cluster are:
When a reception process that wishes to receive the topic data is started on its own computer, a reception process start notification indicating the start of the reception process is sent to all other computers in the computer cluster to which the computer belongs,
(5) The representative computer belonging to the same computer cluster as the computer that transmitted the reception process activation notification is:
Upon receipt of the reception process activation notification, if the transmission process activation notification is received from another representative computer, the other representative computer that has transmitted the transmission process activation notification via the representative computer network. Send a notification to receive,
(6) The representative computer that has received the reception request notification
Receiving the topic data from the computer started by the transmission process in the cluster to which it belongs, and transmitting the received topic data to the representative computer that has transmitted the reception request notification via the representative computer network;
(7) The representative computer that has received the reception request notification
A distributed computer system, wherein the topic data is transmitted to the computers in the same cluster that transmitted the reception process activation notification.

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