KR20010090635A - System and method of communication for multiple server system - Google Patents

Abstract

PURPOSE: A communicating system for a multiplexing server system and a method thereof are provided to offer a communicating method and a system for assuring a convenient and reliable communication between each servers. CONSTITUTION: The elements of the system are described as follows. The first server group(100) and the second server group(110) are provided by binding servers performing the same function, respectively. An active server(101) performing a service and a stand-by server(102) being stood-by out of servers included in the first server group(100) are provided. An active server(111) performing a service and a stand-by server(112) being stood-by out of servers included in the second server group(110) are provided. All servers may perform operations as data transmission, a trouble supervision, and a conversion of a server through networks(120,130). One host name may be allocated in the first server group(100). Each server(101, 102) being grouped in the first host(100) may be allocated as an alias name. The servers of the first server group and the second server group may be communicated through a multiplexed network. The servers included in the first server group(100) and the second server group(110) are connected to the networks(120,130) simultaneously.

Description

Communication system and method for multiplexing server system {SYSTEM AND METHOD OF COMMUNICATION FOR MULTIPLE SERVER SYSTEM}

The present invention relates to a server multiplexing system and a communication method for server multiplexing, and more particularly, to a communication protocol and an operating software system for maintaining an uninterrupted communication state between a plurality of servers.

In the case of the server system for the exchange control, a high reliability service is required without interruption under any circumstances. Therefore, if a server is multiplexed and monitored, and the active server fails, the server that is standing by is fast. A method of restoring a service by switching in time is being used.

The server multiplexing technique disclosed in US Pat. Nos. 5,812,751 and 5,596,720 solves the problem of synchronization of data managed by active and standby servers because two multiplexed servers are operating while sharing a data storage unit. However, the server multiplexing technique disclosed in the above-described United States patent is a service interruption while the standby server is switching services when the active server has failed, so that data is lost and service recovery is delayed during the switching period. There is this.

Moreover, in the case of a distributed processing system using a plurality of servers and a multiplexed network, respectively, each server needs to send and receive messages quickly and safely without any additional burden of multiplexing. That is, if a process is restarted in a standby system where a host that is loaded with a process that needs to receive a message is down and waiting, You must reconnect to resume communication.

In addition, when attempting to communicate through multiple network ports that are multiplexed due to an abnormal network port being used, the sender's process bears the burden of detecting an abnormality of the network port and resuming communication through a new available network port. shall.

In addition, even when a server on which the receiving process is loaded fails in receiving a message, a process of the sending server continuously transmits the message (SEND), which may cause a problem that the transmitted message is lost. Therefore, in the multiplexed distributed server system, there is an urgent need for the emergence of a new type of communication protocol and operating software module that can guarantee communication between each server conveniently and reliably.

Accordingly, a first object of the present invention is to provide a communication method and system for ensuring convenient and reliable communication between respective servers in a multiplexed distributed server system.

According to a second aspect of the present invention, in addition to the first object, a communication method between multiplexed servers capable of continuously providing a service without loss of data even when a server fails or a communication network fails. To provide a system.

The third object of the present invention is, in addition to the first object, a multiplexed server that solves the additional burden of searching for an active server or finding an active communication port in communicating messages between the multiplexed servers. To provide a communication method and system between the two.

A fourth object of the present invention is, in addition to the first object, in communication of messages between multiplexed networks and multiplexed servers, the communication of managing the state of the network, maintaining the communication channel, changing the multiplexed system, and the like. To provide a protocol and software module.

1 is a diagram showing an embodiment of the configuration of a multiplexing server system according to the present invention;

2 is a diagram showing an embodiment of an apparatus configuration of a multiplexing server according to the present invention;

Figure 3a illustrates an embodiment of a workflow of the operating method of the multiplexing server system according to the present invention.

3B is a working flow diagram illustrating a connection method between initial servers according to a preferred embodiment of the present invention.

3C is a flowchart illustrating a method of checking whether a server to receive a message exists in a VMP configuration table according to a preferred embodiment of the present invention.

3d is a flowchart illustrating a method of retransmitting a message stored in a file when a network or server failure is recovered according to a preferred embodiment of the present invention.

In order to achieve the above object, the present invention provides a virtual message path (hereinafter referred to as VMP) process and protocol for message transfer between systems in a multiplexed server system.

The VMP process according to the present invention is a software module having a function of delivering a message, and application processes do not directly transmit and receive messages to and from a target process to communicate with, but via a virtual message path. Send and receive. The VMP process according to the present invention provides a virtual channel between processes, so that each process can safely transmit to only the virtual message path without burdening the processing of various communication failures. target) to be delivered to the process.

By using the VMP process according to the present invention, a user application of a multiplexed server can provide an application programming interface (API) provided only in a virtual message path, leaving the physical layer of message transmission and reception in a black box. application programming interface) Using only a library, a transmission / reception module can be easily produced.

The VMP process according to the present invention includes a function of storing a file when the target application does not receive a message in real time and transmitting the data again when communication is resumed, so that communication can be continued even in the event of a failure. have.

The communication channel of the VMP process according to the present invention is based on TCP / IP, so that local processes have a TCP / IP connection with a local VMP process, and VMP processes have a TCP / IP connection with each other. In the VMP process according to the present invention, the interconnections are independent, and the intersystem connections are multiplexed.

Communication through the VMP process according to the present invention uses the TCP / IP protocol, but applications using the VMP process may communicate via packet-based packets as if they communicate with UDP through the VMP library.

The VMP process according to the present invention is connected to all the units to communicate with, and heartbeat messages are transmitted to and received from the VMP process in all units, thereby immediately detecting an abnormality in the network or a process / host. can do. As a result, the VMP process according to the present invention can provide information required by a process management module (PNR) to monitor network resources.

Hereinafter, preferred embodiments of a multiplexing server system and a communication method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the configuration of a multiplexing server system according to the present invention. Referring to FIG. 1, an active server performing a service among servers included in the first server group 100, the second server group 110, and the first server group grouping servers performing the same function as a group. server 101, a standby server 102 that is stand-by, an active server 111 that is performing a service among servers included in the second server group, and a standby server 112 that is in a standby state are shown. have.

All servers may perform operations such as data transmission, failure monitoring, and server switching between the servers through the network networks 120 and 130. One host name may be assigned to the first server group 100, and the host name of the first server group may be referred to as a first host. The plurality of servers 101 and 102 are in an active state and a standby state for uninterrupted service of the first host.

In addition, each of the servers 101 and 102 grouped in the first host 100 may be assigned an alias name. In addition, the servers of the first server group and the second server group may communicate with each other through a multiplexed network. Servers included in the first server group 100 and the second server group 110 are simultaneously connected to the first network 120 and the second network 130. The network 120 or 130 to which the servers according to the present invention are connected may be one or multiple.

As a preferred embodiment of the present invention, when the network 120, 130 is configured to be two or more, using a network (120, 130) connected to different wholesalers (domain) for one wholesaler In case of network failure, it can be used to use a network connected to another wholesaler.

2 is a block diagram of a multiplexing server apparatus according to a configuration of a multiplexing server system according to the present invention. Referring to FIG. 2, the active server 101 included in the first server group 100 of the multiplexing server system includes a process and resource manager (PNR) module 201 and a duplication guardian process (DGP). Module 202, a virtual message path (VMP) process module 203, a network selection module 204, a VMP configuration table 205, a dynamic alias table 206, and the like. Like the active server 101, the process management module 211, the multiplexed monitoring process module 212, the VMP process module 213, the network selection module 214, the VMP configuration table 215, the dynamic alias table 216 ) And the like.

The process management modules 201 and 211 are generated at the initial stage of driving of the server to create and manage all process modules driven by the server, and the VMP process modules 203 and 213 when sending and receiving messages with the outside. Communicate through.

The multiplexing monitoring process module 202 or 212 communicates data for failure checking at regular time intervals (˜1 second) to check for failure of the multiplexed network 120 or 130 or failure of another server. As a preferred embodiment of the fault communication data communication signal according to the present invention, a heart beat may be used. It also plays a role of connecting the standby server to replace the failed server by changing the dynamic alias table when the communicating server fails.

The VMP process modules 203 and 213 receive and transmit a message to be transmitted to the outside from the server or receive a message from an external server. All servers included in the multiplexing server system according to the present invention send and receive messages through the VMP process module. In addition, the VMP process modules 203 and 213 communicate by packetizing data while using the TCP / IP protocol. Meanwhile, the network selection modules 204 and 214 select a network to communicate with the counterpart server when communicating through the multiplexed network.

The VMP configuration tables 205 and 215 store IP addresses and aliases of all servers participating in the multiplexing server system of the present invention. The VMP configuration table according to the present invention may be configured with a system ID, a server name, one or more server aliases, and a server IP address corresponding to each server alias.

The virtual message channel protocols 201 and 211 receive and transmit data to be transmitted from the inside of the server or receive data from an external server. All servers included in the multiplexing server system according to the present invention exchange messages through a virtual message passage protocol. The virtual message path protocols 201 and 211 communicate by packetizing data while using the TCP / IP protocol.

The network selection modules 202 and 212 select network networks to communicate with counterpart servers when communicating through the multiplexed network. Meanwhile, the process management modules 203 and 213 perform the requested process and transmit the requested process through the virtual message path protocol.

The multiplexing monitoring module 204, 214 communicates data for failure checking at regular time intervals (˜1 second) to check for failure of the multiplexed network 120 or 130 or failure of another server. As a preferred embodiment of the fault communication data communication signal according to the present invention, a heart beat may be used.

The VMP configuration tables 205 and 215 store IP addresses and aliases of all servers participating in the multiplexing server system of the present invention. On the other hand, the dynamic elias tables 206 and 216 correspond to each of the elias of the active server of the server groups and the elias of the standby server, which are classified according to the role performing functions of the servers constituting the multiplexing server system of the present invention. Stores information consisting of one or a combination of names, server aliases, and server IP addresses.

3A is a flowchart illustrating a method of operating a multiplexing server system according to an exemplary embodiment of the present invention. Referring to FIG. 3A, as the servers constituting the multiplexing server system according to the present invention start to operate, the dynamic alias table storing the information of the servers constituting the multiplexing server system is read (step S300). As the servers constituting the multiplexing server system according to the present invention start to operate, each server reads the dynamic Elias table to find out the information of the servers and connects with all the servers.

The VMP process module according to the present invention includes a VMP grammar analysis unit for reading a VMP configuration table, a variable assignment unit for reading a VMP configuration table, and a VMP grammar analysis unit and the variable assignment unit by opening a VMP configuration table. Open the VMP environment setting unit that reads the configuration environment, and open the socket for communication with internal and external systems, and create a connection thread for connecting to the server using its own system ID, It can be configured as a main VMP section that creates a thread that examines the storage file to be delivered to the server and a thread that generates heart beats for multiplexed monitoring.

In creating a dynamic alias table according to the present invention, one of the servers belonging to each server group is registered as an active server, and the other servers are registered as standby servers. The created dynamic Elias table stores the same table for all servers.

In another preferred embodiment of the present invention, the dynamic elias table corresponds to each of these for the elias of the active server and the elimination of the standby server of the server groups classified according to the role performing functions of the servers constituting the multiplexing server system of the present invention. It may consist of information consisting of one or a combination of server name, server alias, server IP address.

In another preferred embodiment according to the present invention, the active server elias and the standby server elias of the server groups classified in the dynamic elias table are all mapped with information about one server to perform various functions in one server. Can be configured as a single server system. Subsequently, the message coming into the active server is registered as a process in the process management module via the VMP process, and the message to be transmitted from the active server is registered in the process management module (step S301).

Then, it is checked whether a server to receive the message registered in the process management module exists in the dynamic alias table (step S302). Then, if there is a server to receive the message, the message is transmitted through the VMP process (step S303). Otherwise, if all the network networks to which a message is to be transmitted have failed, or if a server to receive the message does not exist in the dynamic alias table, the message to be transmitted is stored in a file (step S304).

Subsequently, when the failure of the network or the failure of the server to receive the message is restored and communication with the server receiving the message becomes possible, the message stored in the file is transmitted again (step S305).

3B is a flowchart illustrating a connection method between servers configuring a multiplexing server system according to an exemplary embodiment of the present invention. Referring to Figure 3b, each server participating in the multiplexing server system according to the present invention reads the VMP configuration table to find out its information and the information of all the servers (step S310).

In a preferred embodiment of the present invention, the information of each server may be composed of a combination of a system ID, a server name, one or more server aliases, an IP address corresponding to each server alias, and the like. Subsequently, each server attempts to connect to the server having a system ID larger than its own system ID through the VMP process (step S311).

Subsequently, if a connection is established, it is determined to communicate using a network determined by the server that accepts the connection (step S312). As a preferred embodiment of the present invention, it may be decided to communicate using a network determined by the server requesting the connection. Subsequently, the dynamic Elias table is read to communicate with the server corresponding to Elias (step S313).

3C is a flowchart illustrating a method of confirming whether a server to receive a message exists in the dynamic alias table according to an exemplary embodiment of the present invention. Referring to FIG. 3C, failure checking data is periodically transmitted to all servers registered in the VMP configuration table (step S320). In a preferred embodiment of the present invention, failure check data is transmitted to one or multiple IP addresses of all servers registered in the VMP configuration table at a predetermined time interval (˜1 second), thereby causing a server failure or a network network failure. Can be checked.

Subsequently, the server unilaterally terminates the connection to the server where the failure check data does not arrive for a predetermined time (step S321). In a preferred embodiment of the present invention, the connection can be unilaterally terminated for a server that does not receive the failure check data during a time interval corresponding to twice a predetermined time interval for transmitting the failure check data.

Subsequently, the information on the server whose connection is terminated is deleted from the dynamic alias table (step S322), and the changed dynamic alias table is transmitted to all servers (step S323). In a preferred embodiment of the present invention, if the disconnected server is the standby server in the dynamic alias table, the server is deleted from the dynamic alias table. If the server is an active server, one of the standby servers is registered as the active server and changed to the entire server. Elias tables can be sent. As a preferred embodiment of the present invention, steps S320 to S323 can always be performed while the multiplexing server system according to the present invention is operated.

3d is a flowchart illustrating a method of retransmitting a message stored in a file (step S307) when a failure of a network or a server is repaired according to a preferred embodiment of the present invention. Referring to FIG. 3D, the failure check data is periodically transmitted to the entire server (step S330). When the failure check data is received from the server in which the failure occurs (step S331), the information of the newly connected server is added to the dynamic elias table. (Step S332), the changed dynamic alias table is transmitted to all servers (step S333).

As a preferred embodiment according to the present invention, steps S330 to S333 can always be performed while the multiplexing server system according to the present invention is operated. Subsequently, due to the failure of the network or the server to be connected, the message that was not transmitted but stored as a file is transmitted again (step S334). As a preferred embodiment of the present invention, simply registering the process to be transmitted to the server in the process management module, it is possible to guarantee the reliability of transmitting the message without being limited by the failure of the network or the failure of the server to receive the message. have.

In a preferred embodiment in accordance with the present invention, processes running on each host open the socket for communication by the VMP process module to register with the VMP process module and each process is recalled at initial startup. The process registration may be completed by attempting to connect to the VMP process module through the socket and registering its process name.

The foregoing has outlined rather broadly the features and technical advantages of the present invention to better understand the claims of the invention which will be described later. Additional features and advantages that make up the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted, and changed without departing from the spirit or scope of the invention described in the claims.

As described above, the communication method of the multiplexing server system and the multiplexing server system according to the present invention configures the multiplexed server system and the multiplexed network using the VMP process and the VMP configuration table, and transfers the processes instead of the processes to be transmitted from the server. Thus, unlike the prior art, each process running in the server does not have to burden direct message communication, and can always communicate using the same interface through the VMP process.

As a result, it is possible to ensure the stability of communication in the multiplexed server system and to reduce the time and effort required to develop a program that communicates in the multiplexed system.

Claims (28)

A communication method for transmitting a first message from a first process of a first host constituting a plurality of multiplexed servers on a multiplexed communication network to a second process of a second host, the method comprising: The first process comprises sending the first message to a first VMP process module running on the first host; The first VMP process module reads an available active communication network of the multiplexed communication networks and a system ID of a second server that is active among a plurality of servers multiplexed corresponding to the second host from a VMP configuration table. Shipping step; The first VMP process module sending the first message to the second VMP process module running on the second server using the available communication channel; And The second VMP process module forwarding the first message to the second process of the second server Communication method of the multiplexing system comprising a. The method of claim 1, wherein the first process forwards the first message to the first VMP process module. The first VMP process module opening a socket for communication; And The first process registering its process name with the process manager module at initial startup Multiplexed system communication method further comprising. The method of claim 1, wherein the multiplexing system communication method is Reading, by the first VMP process module, system information of the first server and the plurality of servers from a VMP configuration table; The first VMP process module requesting a connection from the system information to a system ID having a value greater than a system ID of the first server; Determining, by the second VMP process module which has received the connection request from the first VMP process module, which of the multiplexed communication networks to use; The first server and the second server reading a dynamic Elias table to determine a server Elias Multiplexed system communication method comprising a. The method of claim 3, wherein the multiplexing system communication method comprises: Detecting, by the first server of the first host, a communication failure with an active server of the second host Multiplexing system communication method further comprising a preceding. 5. The system of claim 4, wherein the dynamic Elias table comprises one or a combination of Elias corresponding to an active server of the hosts and a standby server, a host name corresponding to the Elias, a server elias, and an IP address. Multiplexing system communication method comprising. The method of claim 1, wherein the VMP configuration table comprises one or a combination of system IDs, host names, aliases, IP addresses, and network interface card names of the plurality of servers. 1. A method of transmitting a first message from a first process of a first host to a second process of a second host constituting a plurality of multiplexed servers on a multiplexed communication network, the method comprising: Detecting, by the multiplexing monitoring process of the first server, which is an active server of the first host, a communication failure with the server 2A, which is an active server of the second host; The multiplexing monitoring process of the first server notifies the first VMP module of the first server of the communication failure, and wherein the first VMP module deletes an alias of the second A server from the dynamic alias table; The first VMP module attempting to connect with the VMP modules of the plurality of servers using the VMP configuration table; Connecting the second VMP module of the second server, which is a standby server of the second host, with the VMP modules of the plurality of servers; Multiplexed system communication method comprising a. The method of claim 7, wherein the second VMP module is connected to the VMP modules of the plurality of servers, Updating system information of the second SS server changed from a standby state to an active state in the dynamic elias table, and transmitting the updated system information to the connected VMP modules; Multiplexed system communication method further comprising. The method of claim 7, wherein the deleting of the alias of the second A server by the first VMP module further comprises: storing, in a file, a first message that the first process intends to send to the second process. Multiplexed system communication method. Each server constituting a multiplexing server system operating on a multiplexed communication network, A VMP module providing an environment for processes running in the server to communicate with processes in other servers connected through the communication network; A VMP configuration table for setting an environment for the VMP module to communicate with each other; Multiplexed monitoring process for discriminating and monitoring the active state and standby state of the server Multiplexed server system comprising a. The apparatus of claim 10, wherein the VMP module comprises: a VMP grammar interpreter configured to read the VMP configuration table; A variable allocator configured to read the VMP configuration table; A VMP environment setting unit which opens the VMP environment setting table and reads a setting environment using the VMP grammar analysis unit and the variable assignment unit; Opens a socket for communication with internal and external systems, creates a connection thread to connect to the system using its system ID, examines the storage file to be delivered to the external system, and a hint bit for multiplexed monitoring. Main VMP part to create a thread that fires Multiplexed server system comprising a. The multiplexing server system of claim 11, wherein the VMP configuration table comprises one or a combination of system IDs, host names, aliases, IP addresses, and network card names of the plurality of servers. In the method of multiplexing a server system consisting of a plurality of servers, Registering information of servers included in the server system in a VMP configuration table; Connecting to all servers using the VMP configuration table while the server system starts operation; Registering the connected servers in a dynamic alias table; Registering a message to be transmitted by a server using the dynamic alias table; If a server to receive the registered message exists in a dynamic alias table, sending a message; Storing a message to be transmitted if the server to receive the registered message does not exist in the dynamic alias table; And Transmitting the stored message again after the service failure is recovered. Multiplexed server communication method comprising a. The method of claim 13, wherein the registering of the servers included in the server system in a VMP configuration table comprises: Registering as a server group according to a function of a server constituting the server system; Registering names of the servers; Registering Elias of a server corresponding to one or a plurality of network networks connected to servers included in the server group; And Registering an address of a server corresponding to the aliases of the server Multiplexed server communication method comprising a. 15. The method of claim 14, wherein registering the names of the servers Step of attaching system IDs in order according to the order of registered servers Multiplexed server communication method further comprising. The method of claim 13, wherein the server system starts to operate and connects to all servers using the VMP configuration table. Reading the VMP configuration table; Recognizing a system ID of the system from the VMP configuration table; And Attempting to connect with servers having a system ID larger than its own system ID among the servers registered in the VMP configuration table Multiplexed server communication method comprising a. 14. The method of claim 13, wherein registering the connected servers in a dynamic alias table Designating one server among the plurality of servers configuring each host as an active server alias; And Designating a server not designated as an active server among the plurality of servers configuring each host as a standby server elias Multiplexed server communication method comprising a. The method of claim 13, wherein registering a message to be transmitted by a server using the dynamic alias table comprises: Registering a message to be sent by the server with a process management module Multiplexed server communication method comprising a. 15. The method of claim 13, wherein if a server to receive the registered message is in a dynamic alias table, sending the message is Retrieving whether an active server of a server group to receive the registered message exists in a dynamic alias table; And Transmitting a message through a VMP process if there is an active server to receive the message Multiplexed server communication method comprising a. 15. The method of claim 13, wherein if there is an active server to receive the message, transmitting the message through a VMP process Packetizing the message in a VMP process; And Sending the message to the partner server's VMP process using the TCP / IP protocol Multiplexed server system operation method further comprising. The method of claim 13, wherein the resending of the stored message after the service failure is recovered Periodically searching for a dynamic alias table and checking whether there is an active server to receive the stored message; And If the server to receive the stored message is registered in the VMP configuration table, transmitting the stored message again. Multiplexed server communication method comprising a. In the method for checking a failure of a multiplexed server system using a multiplexed server and a multiplexed network, Periodically transmitting failure check data to all servers registered in a VMP configuration table by the servers constituting the multiplexing server system; Unilaterally terminating the connection if the failure inspection data is not returned from the server receiving the periodic failure inspection data for a predetermined time interval; Removing information of the server from which the connection is terminated from the dynamic alias table; And Transmitting the dynamic Elias table to all servers Multiplexed server communication method comprising a. 23. The method of claim 22, wherein removing information of the server from which the connection is terminated is removed from the dynamic alias table. Switching the standby server of the same group to the active server when the server where the connection is terminated is registered as an active server in the dynamic alias table; And Removing the information of the server when the connection terminated server is registered as a standby server in the dynamic alias table. Multiplexed server communication method further comprising. In the method of checking that a failure of a server or a failure of a network constituting a multiplexed server system using a multiplexed server and a multiplexed network has been recovered, Periodically transmitting failure check data to the entire server while the servers constituting the multiplexing server system are in operation; Checking whether the failure inspection data has been received from a server that is not registered in the dynamic alias table; And If the failure check data is received from a server that is not registered in the dynamic Elias table, registering the information of the server in the dynamic Elias table. Multiplexed serverized server communication method comprising a. In the multiplexing device of one or more servers constituting a multiplexing server system, A VMP process for establishing data communication between the servers; A VMP configuration table for storing the list of servers; Failure check data transmission unit for transmitting or sending failure check data between the servers Multiplexed server system comprising a. 27. The VMP process of claim 25, wherein the VMP process for establishing data communication between the servers is VMP process with the capability to packetize, send and receive data using the TCP / IP protocol Multiplexed server system comprising a. 27. The system of claim 25, wherein the VMP configuration table that stores the list of servers is A table for generating a system ID of all servers participating in the multiplexing server system and specifying an alias for the IP address of the servers. Multiplexed server system comprising a. The fault check data transmission unit of claim 25, wherein the fault check data transmission unit configured to transmit or send fault check data between the servers. Data transmission unit for transmitting the failure detection data to the servers included in the multiplexing server system at regular time intervals using the data transmission path of the servers, and checks the data to be returned Multiplexed server system comprising a.