JP2007249913A - Data management system, data management program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data management system, data management program, and recording medium which can execute normal data management service even when a computer for constructing a distributed data management system goes out of order. <P>SOLUTION: A storage 12 stores a data management table which includes a corresponding section including data information managed by the own distributed data management system 1 and a copy section including the data information managed by one or a plurality of other distributed data management systems 1, and a message processing section 110 executes processing according to content of a message when the data information to be processed is included in the received message and in the corresponding section or the copy section of the data management table. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data management apparatus that manages data distributed on a computer network. The present invention also relates to a data management program for causing a computer to realize the functions of the data management apparatus, and also relates to a computer-readable recording medium on which the data management program is recorded.

  There is a distributed data management system composed of a group of computers connected to a network continuously or temporarily regardless of a specific server. Using this system, for example, when the user knows the name of the data but does not know the location of the data on the network, the user requests information on the computer that owns the data. It is possible to provide a data name resolution service in which the user is notified in response to the request. A system using a distributed hash table technique is known as a distributed data management system. The Chord Project of MIT University is well known as a distributed hash table technique applied to a distributed data management system (see Non-Patent Document 1).

In Chord, a unique identifier of 160 bits is assigned to each data and a computer that manages the data. As a 160-bit identifier, an output value (hash value) of a hash function called SHA-1 (Secure Hash Algorithm 1) is generally used (see Non-Patent Document 2). Each identifier constitutes a circulating hash space (see FIG. 8). Data management is performed by a computer having an identifier that appears next when viewed in the positive direction (in the direction of arrow A in FIG. 8) from the identifier of the data in the hash space. As an example, assume a system that manages q pieces of data with p computers. The identifier of the host computer IDs1, IDs2, ···, IDsp, the data identifier IDd1, IDd2, ···, When Iddq, the computer having an identifier ^{IDs1, IDsp <x ≦ 2 160} -1 and 0 ≦ x < Manage data with identifiers in the range of IDs1. The computer having the identifier IDs2 manages data having identifiers in the range of IDs1 <x <IDs2. Hereinafter, information relating to this data management is referred to as a “data management table”.

  Next, a failure countermeasure method in a conventional distributed data management system will be described based on the contents of Non-Patent Document 1. Each computer constituting the system recognizes the computer having the next appearing identifier as its own SUCCESSOR when viewed in the positive direction (in the direction of arrow A in FIG. 8) from its own identifier on the hash space. . “Recognized” indicates that the IP address and port number of SUCCESSOR are held, and that messages can be transmitted to and received from SUCCESSOR. Similarly, each computer recognizes a computer having an identifier that appears next as its own PREDECESSOR when viewed in the negative direction (in the direction of arrow B in FIG. 8) from its own identifier on the hash space. Further, each computer holds information of r computers appearing in the positive direction when viewed from its own identifier in the hash space as a SUCCESSOR LIST or a Finger Table.

  The part called “SUCCESSOR List” or “Finger Table” and the two entries for managing SUCCESSOR / PREDECESSOR are collectively called a routing table. The contents of the routing table and data management table are periodically updated by a confirmation process called stabilization. Specifically, each computer detects a new computer that should be added to its own route table and a computer that should be deleted from its own route table (a computer that has no response due to a failure, etc.) and is autonomous. Update the routing table and data management table.

In such a system, the operation when a computer fails will be described. When a computer in the computer group that constitutes the system fails, the SUCCESSOR of that computer detects the departure of the PREDECESSOR during Stabilization, updates the routing table, and again manages the management information of the data that the PREDECESSOR was responsible for Rebuild and add to your own data management table. In addition, a computer that holds information about a failed computer as an entry in the routing table detects that the computer has left the system during stabilization, and updates the routing table. As described above, a computer that remains in the system autonomously responds to a failure of a computer that constitutes the system, thereby maintaining a state in which a distributed data management service can be provided.
I. Stoica, et. Al., “Chord: A Scalable Peer-to-peer Lookup Protocol for Internet Applications”, Proceedings of the 2001 ACM SIGCOMM Conference, 2001 FIPS 180-1, “Secure Hash Standard”, US Department of Commerce / NIST, National Technical Information Service, Springfield, VA, Apr. (1995)

  However, in a conventional distributed data management system, when a computer that constitutes the system fails, the failed computer manages at least until the next stabilization is executed and the routing table and data management table are updated. There is a problem that it becomes impossible to provide a user with a data management service.

  The present invention has been made in view of the above-described problems, and is a data management apparatus and data that can perform a normal data management service even when a data management apparatus constituting a distributed data management system fails. It is an object to provide a management program and a recording medium.

  The present invention has been made in order to solve the above-described problem, and in a data management apparatus for managing data distributed on a computer network, a first data management including data information managed by its own data management apparatus Storage means for storing information and second data management information including information on data managed by one or more other data management devices; and message receiving means for receiving a message including information on data to be processed The first data management information or the second data management information is read from the storage means, and the information on the processing target data included in the received message is the first data management information or the second data management information. Message processing means for executing processing according to the content of the message when it is included in the data management information A data management apparatus according to symptoms.

  The data management apparatus according to the present invention may be configured such that the information on the processing target data included in the received message is not included in the first data management information or the second data management information. And a message transfer means for transferring the message to one or a plurality of data management devices other than the data management device that manages the data identified by the second data management information.

  The present invention also provides a data management apparatus for managing data distributed on a computer network, the first data management information including data information managed by its own data management apparatus, and one or more other data managements. Storage means for storing second data management information including information on data managed by the apparatus, message receiving means for receiving a message including information on data to be processed, and storing the first data management information Message processing means for executing processing in accordance with the content of the message when information on data to be processed included in the received message read from the means is included in the first data management information; Read the second data management information from the storage means, and information on the data to be processed included in the received message Data management comprising: message transfer means for transferring the message to a data management device for managing data to be processed included in the message when included in the second data management information Device.

  Further, in the data management device of the present invention, the message processing means further does not receive the message reception confirmation response from the data management device to which the message is transferred within a predetermined time after the message is transferred. In this case, the process according to the content of the message is executed.

  In the data management device of the present invention, the message transfer means may further include information on data to be processed included in the received message in both the first data management information and the second data management information. If not included, the message is transferred to one or more data management devices other than the data management device that manages the data identified by the second data management information.

  The present invention also provides a data management program for causing a computer to realize a function of managing data distributed on a computer network, the first data management information including information on data managed by its own computer, A function for storing second data management information including information on data managed by a plurality of other computers in a storage unit; a function for receiving a message including information on data to be processed; and the first data management. The information or the second data management information is read from the storage means, and the information on the data to be processed included in the received message is included in the first data management information or the second data management information. A function to execute processing in accordance with the contents of the message Is a data management program to butterflies.

  Further, the data management program of the present invention provides a case where the information on the data to be processed included in the received message is not included in the first data management information or the second data management information. The computer is configured to realize a function of transferring the message to one or a plurality of computers other than the computer that manages the data identified by the second data management information.

  Further, the present invention provides a data management program for causing a computer to realize a function of managing data distributed on a computer network, the first data management information including data information managed by its own data management device, A function for storing in the storage means second data management information including information on data managed by one or more other data management devices; a function for receiving a message including information on data to be processed; 1 data management information is read from the storage means, and when the information on the processing target data included in the received message is included in the first data management information, processing according to the content of the message And the second data management information is read from the storage means and included in the received message Causing the computer to realize a function of transferring the message to the computer that manages the data to be processed included in the message when information on the data to be processed is included in the second data management information. It is a data management program characterized.

  In addition, the data management program of the present invention, when a message reception confirmation response is not received from a computer to which the message is transferred within a predetermined time after the message is transferred, The computer is configured to realize a function of executing the processing according to the above.

  Further, the data management program of the present invention provides a case where the information on the data to be processed included in the received message is not included in the first data management information or the second data management information. The computer is configured to realize a function of transferring the message to one or a plurality of computers other than the computer that manages the data identified by the second data management information.

  The present invention is also a computer-readable recording medium on which the data management program is recorded.

  According to the present invention, even if another data management device that manages the data to be processed is broken when the message is received, the data management device that has received the message replaces the data management device. Since the process according to the content of the message is executed, an effect that a normal data management service can be performed is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a distributed data management system according to an embodiment of the present invention. In FIG. 1, a plurality of distributed data management devices 1 and user terminals 2 are connected so as to be able to communicate with each other via a communication network 300. Both the distributed data management device 1 and the user terminal 2 are computers. Each of the distributed data management device 1 and the user terminal 2 includes a processing device for processing and calculating data, a storage device for storing data, an input device for a user to input instructions to the computer, and a processing result. A desired function is realized by a hardware (such as an output device) that outputs and software (program) that collects procedures and instructions for controlling the computer working together.

  In the distributed data management device 1, the communication processing unit 10 controls communication with other distributed data management devices 1 and user terminals 2, and transmits and receives data. The processing unit 11 executes various processes related to data management. The storage unit 12 stores a route table and a data management table. In the processing unit 11, the message processing unit 110 executes processing based on a message received from another distributed data management device 1 or the user terminal 2. The routing table / data management table update processing unit 111 executes processing similar to that of the conventional stabilization, and updates the contents of the routing table and data management table stored in the storage unit 12.

  In this embodiment, each distributed data management device 1 constituting the distributed data management system manages the data that it is in charge of, and also has one or more other identifiers that have identifiers close to their own identifiers in the hash space A copy of the management information of the data handled by the distributed data management device 1 is held. As a result, as will be described later, when a distributed data management device 1 fails, a copy of the management information of the data that the distributed data management device 1 was in charge of is distributed even before the execution of stabilization. Since it is stored in the data management device 1, it is possible to provide a data management service to the user.

  The routing table stored in the storage unit 12 includes information (for example, IP address and port number) necessary for communication with other distributed data management devices 1. FIG. 2 shows an example of the route table. The routing table includes a part called “SUCCESSOR List” or “Finger Table” and two entries for managing SUCCESSOR and PREDECESSOR. The “SUCCESSOR List” or “Finger Table” includes the identifier (device identifier) of another distributed data management device 1, and the IP address and port number of the distributed data management device 1. It is assumed that the processing unit 11 communicates with another distributed data management device 1 via the communication processing unit 10, creates a route table based on the communication result, and stores it in the storage unit 12 in advance.

  The data management table stored in the storage unit 12 includes information about data managed by itself and other distributed data management devices 1 (for example, the IP address and port number of the device storing the data). FIG. 3 shows an example of the data management table. The data management table includes an area ("responsible part" in FIG. 3) including data information (first data management information) for which it is responsible, and a duplicate (second data) of the data management table for which PREDECESSOR is responsible. Management area) ("replication part" in FIG. 3). As is clear from this definition, the “duplicate part” of the data management table owned by itself is the same as the “responsible part” of the data management table owned by PREDECESSOR.

  The “responsible part” and “replicated part” include the identifier of the data to be managed (data identifier), the IP address and port number of the computer that holds the data, and the IP of the distributed data management device 1 that manages the data Address and port number. The information contained in the “Replication Part” is not limited to the “Responsibility Part” copy held by PREDECESSOR, but the “Responsibility Part” of one or more other distributed data management devices 1 other than itself is duplicated. It may be included in the “replicated portion”.

  It is assumed that the processing unit 11 stores in advance data information managed by itself in the data management table. In addition, the processing unit 11 communicates with another distributed data management device 1 via the communication processing unit 10, acquires information on a part in charge of the distributed data management device 1 from the other distributed data management device 1, and transmits data It is assumed that it is stored in advance in the management table.

  When the user terminal 2 searches for the location of the data based on the instruction from the user, the user terminal 2 sends a message for requesting the data information to the distributed data management device 1 known by the user terminal 2. Send. Further, when the distributed data management device 1 receives a message from the user terminal 2, the distributed data management device 1 transfers the message to another distributed data management device 1 as necessary. FIG. 4 shows an example of the above message. “Destination IP address” and “Destination port number” indicate the IP address and port number of the distributed data management device 1 that is the destination of the message, respectively. “Source IP address” and “Source port number” indicate the IP address and port number of the distributed data management device 1 or user terminal 2 that is the message source, respectively.

  “Processing target identifier” indicates an identifier of data to be processed by the computer. “Command” indicates the processing content to be performed by the computer on the data identified by the processing target identifier. This processing content means, for example, returning information on the IP address and port number corresponding to the processing target identifier on the data management table to the transmission source, or registering / deleting an entry in the data management table. Is shown. The message also includes a source IP address and a source port number for identifying the user terminal 2 that created the message and sent the message.

  Next, the operation of the distributed data management device 1 according to this embodiment will be described. First, the operation of the distributed data management apparatus 1 when receiving a message from another distributed data management apparatus 1 or the user terminal 2 will be described with reference to FIG. The communication processing unit 10 receives only a message whose destination IP address and destination port number indicate itself (step S100). When receiving the message, the communication processing unit 10 outputs the message to the message processing unit 110. The message processing unit 110 sends a confirmation message (reception confirmation response) via the communication processing unit 10 to the distributed data management device 1 or user terminal 2 identified by the transmission source IP address and the transmission source port number. Transmit and respond (step S101).

  Subsequently, the message processing unit 110 confirms the processing target identifier in the message, and sequentially reads out the data identifier of the responsible part in the data management table stored in the storage unit 12 and compares it with the processing target identifier. It is determined whether there is an identifier that matches the processing target identifier among the data identifiers (step S102). If the processing target identifier is an identifier within the range of the responsible part (if the data identifier of the responsible part has an identifier that matches the processing target identifier), the message processing unit 110 follows the contents of the command in the message. The process is executed (step S103).

  On the other hand, when the processing target identifier is not an identifier within the range of the responsible portion (when there is no identifier that matches the processing target identifier in the data identifier of the responsible portion), the message processing unit 110 stores in the storage unit 12 The data identifier of the duplicate portion in the data management table thus read is sequentially read and compared with the processing target identifier, and it is determined whether or not there is an identifier that matches the processing target identifier in the duplicate portion data identifier (step S104). . When the processing target identifier is an identifier within the range of the duplicate part (when the duplicate part has a data identifier that matches the process target identifier), the message processing unit 110 follows the contents of the command in the message. The process is executed (step S103).

  On the other hand, when the processing target identifier is not an identifier within the range of the duplicated portion (when there is no identifier that matches the processing target identifier in the data identifier of the duplicated portion), the message processing unit 110 reads the path table from the storage unit 12. (Step S105), the identifier of the distributed data management device 1 in the routing table and the processing target identifier are compared, and the distributed data management device 1 as the message transfer destination is determined (step S106). Subsequently, the message processing unit 110 rewrites the destination IP address and destination port number of the message with the IP address and port number of the distributed data management device 1 as the transfer destination, and sets the source IP address and source port number to its own IP address. Then, the port number is rewritten, and the message is transferred via the communication processing unit 10 (step S107). There may be one or more distributed data management devices 1 as message transfer destinations.

  After the message is transferred, the message processing unit 110 waits for a response from the distributed data management apparatus 1 that is the transfer destination, and determines whether there is a response (step S108). If there is a response within a predetermined time after the message is transferred (that is, the distributed data management device 1 at the transfer destination is operating normally), the processing ends. On the other hand, if there is no response within a predetermined time after the message is transferred, the process returns to step S105, and a process of searching the route table again to determine another transfer destination and a message transfer process are performed. The same processing is performed until a response is received from the distributed data management apparatus 1 as the transfer destination.

  According to the above, even if the information on the data to be processed included in the received message is not included in the portion in charge of the data management table, but is included in the duplicate portion, the content of the message is followed. Processing is performed. Therefore, even if another distributed data management device 1 that manages the data to be processed is broken when the message is received, the distributed data management device that has received the message on behalf of the distributed data management device 1 1 performs processing according to the content of the message, so normal data management service can be performed without delay.

  Further, according to the above, when the information on the data to be processed included in the received message is not included in the portion in charge of the data management table or in the replica portion, the data identifier included in the replica portion is identified. The message is transferred to one or a plurality of other distributed data management devices 1 other than the distributed data management device 1 that manages the data to be processed. As a result of the transfer of the message in this way, the distributed data management device 1 having the information of the data to be processed in the responsible part or the duplicate part executes the process according to the content of the message, so that the normal data management service Can be done without delay.

  Next, another operation example of the distributed data management device 1 when receiving a message from another distributed data management device 1 or the user terminal 2 will be described with reference to FIG. Similarly to steps S100 to S101 in FIG. 5, when a message is received (step S200), a response is made to the message transmission destination (step S201).

  Subsequently, the message processing unit 110 confirms the processing target identifier in the message, and sequentially reads out the data identifier of the responsible part in the data management table stored in the storage unit 12 and compares it with the processing target identifier. It is determined whether there is an identifier that matches the processing target identifier among the data identifiers (step S202). If the processing target identifier is an identifier within the range of the responsible part (if the data identifier of the responsible part has an identifier that matches the processing target identifier), the message processing unit 110 follows the contents of the command in the message. The process is executed (step S203).

  On the other hand, when the processing target identifier is not an identifier within the range of the responsible portion (when there is no identifier that matches the processing target identifier in the data identifier of the responsible portion), the message processing unit 110 stores in the storage unit 12 The data identifier of the duplicate part in the data management table thus read is sequentially read and compared with the processing target identifier, and it is determined whether or not there is an identifier that matches the processing target identifier in the duplicate part data identifier (step S204). . When the processing target identifier is a data identifier within the range of the duplicate part (when there is an identifier that matches the process target identifier in the duplicate part data identifier), the message processing unit 110 receives the IP address of the duplicate part and Another distributed data management device 1 identified by the port number is determined as the message transfer destination (step S205). The distributed data management device 1 that is a message transfer destination has the above-described processing target identifier in a portion in charge in the data management table.

  Subsequently, the message processing unit 110 rewrites the destination IP address and destination port number of the message with the IP address and port number of the distributed data management device 1 as the transfer destination, and sets the source IP address and source port number to its own IP address. Then, the port number is rewritten, and the message is transferred via the communication processing unit 10 (step S206). After the message is transferred, the message processing unit 110 waits for a response from the distributed data management apparatus 1 that is the transfer destination, and determines whether there is a response (step S207). If there is a response within a predetermined time after the message is transferred (that is, the distributed data management device 1 at the transfer destination is operating normally), the processing ends. On the other hand, when there is no response within a predetermined time after the message is transferred, the message processing unit 110 executes processing according to the content of the command in the message received in step S200 (step S203).

  On the other hand, as a result of the determination in step S204, if the processing target identifier is not an identifier within the range of the replication portion (when there is no identifier that matches the processing target identifier in the replication portion data identifier), FIG. Processing similar to steps S105 to S108 is performed (steps S208 to S211).

  According to the above, when the information of the data to be processed included in the received message is included in the replication part of the data management table, the distributed data that manages the data identified by the data identifier included in the replication part The message is transferred to the management device 1. As a result of the transfer of the message in this way, the distributed data management device 1 having the information of the data to be processed in the responsible part or the duplicate part executes the process according to the content of the message, so that the normal data management service Can be done without delay.

  In addition, in the case where the reception confirmation response to the message is not received from the distributed data management device 1 that manages the data identified by the data identifier included in the duplicate part, the distributed data that has transferred the message to the distributed data management device 1 Since the management device 1 executes processing according to the content of the message, a normal data management service can be performed without delay.

  Next, with reference to FIG. 7, a procedure for updating the route table and the data management table stored in the storage unit 12 will be described. The routing table / data management table update processing unit 111 periodically communicates with the other distributed data management device 1 that holds the information of its own duplicate part included in the routing table as information of the part in charge via the communication processing unit 10. The response is confirmed automatically (step S300). When there is a response from another distributed data management device 1 (YES in step S301), the routing table / data management table update processing unit 111 further takes charge of the distributed data management device 1 from the distributed data management device 1. The information of the part is acquired, the information of the part in charge is compared with the information of the duplicate part of itself, and the information of the duplicate part of itself is updated to the latest information (step S302).

  On the other hand, when there is no response due to a failure or the like (in the case of NO in step S301), the routing table / data management table update processing unit 111 determines that another distributed data management device 1 has left the system. By adding the information of (the part in charge of the other distributed data management device 1 that has left) to the information of the part in charge of itself, the part in charge of the data management table is updated (step S303).

  Subsequently, the route table / data management table update processing unit 111 performs an update process such as deleting information of the other distributed data management device 1 that has left the network (step S304). Finally, the routing table / data management table update processing unit 111 communicates with another distributed data management device 1 based on the routing table, obtains information on the responsible portion from the distributed data management device 1, and replicates itself. Add to the part information. As a result, the process ends after the duplicate portion of the data management table is updated.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. For example, a program for realizing the operation and function of the distributed data management device 1 according to the above-described embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by the computer and executed. May be.

  Here, the “computer” includes a homepage providing environment (or display environment) if the WWW system is used. The “computer-readable recording medium” refers to a storage device such as a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a hard disk built in the computer. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program described above may be transmitted from a computer storing the program in a storage device or the like to another computer via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. Further, the above-described program may be for realizing a part of the above-described function. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer, what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of the distributed data management system by one Embodiment of this invention. It is a reference figure which shows the content of the routing table in one Embodiment of this invention. It is a reference figure which shows the content of the data management table | surface in one Embodiment of this invention. It is a reference figure which shows the structure of the message in one Embodiment of this invention. It is a flowchart which shows the procedure of operation | movement of the data management apparatus by one Embodiment of this invention. It is a flowchart which shows the procedure of operation | movement of the data management apparatus by one Embodiment of this invention. It is a flowchart which shows the procedure of operation | movement of the data management apparatus by one Embodiment of this invention. It is a reference figure which shows the mode of the arrangement | positioning of the identifier in the hash space to circulate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Distributed data management apparatus, 2 ... User terminal, 10 ... Communication processing part (message receiving means, message transfer means), 11 ... Processing part, 12 ... Storage part (storage means) 110 ... Message processing unit (message processing means) 111 ... Route table / data management table update processing unit, 300 ... Communication network

Claims (11)

In a data management device for managing data distributed on a computer network,
Storage means for storing first data management information including information on data managed by its own data management device and second data management information including information on data managed by one or more other data management devices When,
Message receiving means for receiving a message including information on data to be processed;
The first data management information or the second data management information is read from the storage means, and the information on the processing target data included in the received message is the first data management information or the second data. Message processing means for executing processing according to the content of the message when it is included in the management information;
A data management apparatus comprising:   When the information on the data to be processed included in the received message is not included in the first data management information or the second data management information, it is identified by the second data management information. The data management apparatus according to claim 1, further comprising message transfer means for transferring the message to one or a plurality of other data management apparatuses other than the data management apparatus that manages the data to be processed. In a data management device for managing data distributed on a computer network,
Storage means for storing first data management information including information on data managed by its own data management device and second data management information including information on data managed by one or more other data management devices When,
Message receiving means for receiving a message including information on data to be processed;
When the first data management information is read from the storage means and the information on the data to be processed included in the received message is included in the first data management information, the content of the message is followed. Message processing means for executing the processing,
The processing included in the message when the second data management information is included in the second data management information after the second data management information is read from the storage means and the received data information included in the message is included in the second data management information Message transfer means for transferring the message to a data management device for managing target data;
A data management apparatus comprising:   The message processing means further follows the content of the message when the message reception confirmation response is not received from the data management device that is the transfer destination of the message within a predetermined time after the message is transferred. 4. The data management apparatus according to claim 3, wherein the processing is executed.   The message transfer means further includes the first data management information and the second data management information when the information on the data to be processed included in the received message is not included in the second data management information. 4. The data management apparatus according to claim 3, wherein the message is transferred to one or a plurality of other data management apparatuses excluding a data management apparatus that manages data identified by the data management information of 2. In a data management program for causing a computer to perform a function of managing data distributed on a computer network,
A function of storing first data management information including information of data managed by its own computer and second data management information including information of data managed by one or more other computers in a storage unit;
A function for receiving a message including information on data to be processed;
The first data management information or the second data management information is read from the storage means, and the information on the processing target data included in the received message is the first data management information or the second data. A function of executing processing according to the content of the message when included in the management information;
A data management program characterized by causing a computer to realize the above.   When the information on the data to be processed included in the received message is not included in the first data management information or the second data management information, it is identified by the second data management information. 7. The data management program according to claim 6, which causes a computer to realize a function of transferring the message to one or a plurality of computers other than a computer that manages data to be processed. In a data management program for causing a computer to perform a function of managing data distributed on a computer network,
First data management information including information on data managed by its own data management device and second data management information including information on data managed by one or more other data management devices are stored in the storage means. Function
A function for receiving a message including information on data to be processed;
When the first data management information is read from the storage means and the information on the data to be processed included in the received message is included in the first data management information, the content of the message is followed. A function to execute the processing,
The processing included in the message when the second data management information is included in the second data management information after the second data management information is read from the storage means and the received data information included in the message is included in the second data management information A function of transferring the message to a computer managing target data;
A data management program characterized by causing a computer to realize the above.   The computer has a function of executing processing in accordance with the content of the message when a message reception confirmation response is not received from the computer to which the message is transferred within a predetermined time after the message is transferred. The data management program according to claim 8, wherein the data management program is implemented.   When the information on the data to be processed included in the received message is not included in the first data management information or the second data management information, it is identified by the second data management information. 9. The data management program according to claim 8, which causes a computer to realize a function of transferring the message to one or more other computers than a computer that manages the data to be processed. The computer-readable recording medium which recorded the data management program in any one of Claims 6-10.

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