JP5104693B2 - SIP application server load balancer and operation method thereof - Google Patents

Description

  The present invention relates to a network communication system such as a telephone network and an Internet network, and in particular, a load balancer (load distribution device) in a session initialization protocol (SIP) application server that provides additional services such as transfer and presence. And its operating method.

  Conventionally, in a network that provides services such as an IP (Internet Protocol) telephone having SIP as a control protocol, a SIP application server is sometimes used as a server that provides additional services such as transfer and presence. Further, as shown in FIG. 2, a configuration in which a plurality of application servers are arranged from the viewpoint of improving processing capability and ensuring reliability at the time of failure and a load balancer is arranged in front of the server configuration is generally used.

  Java (trademark of Sun Microsystems Inc., USA) is often used as a platform development language for application servers. Java has a GC (Garbage Collection) function that automatically releases a memory area dynamically allocated by a program when it is no longer needed.

  There are several types of GC, but when the memory area that the program can dynamically allocate decreases, a GC called Fu11 GC will eventually occur. When Fu11 GC occurs, the processing capacity of the entire application server is greatly reduced.

By the way, in Patent Document 1, as one method of avoiding the decrease in processing capacity due to Fu11 GC, the occurrence of Full GC is predicted from the memory usage rate, and the load balancer distributes requests to the application server where Fu11 GC is occurring. No examples are disclosed.
JP 2007-328413 A

  In a conventional load balancer, when request distribution is performed avoiding application servers that are generating a GC, if multiple application servers generate a GC at the same time, the overall processing capacity is significantly reduced. At this time, there is a method of monitoring the usage rate of the memory of the own server or resources other than the memory mainly by the application server. However, with this method, it is difficult to avoid the occurrence of GC simultaneously with other application servers. Here, “simultaneous” means not only that the occurrence times of GC are the same, but even if the occurrence times are different, multiple application servers are in a state from the occurrence of GC to the end, that is, the occurrence of GC, at a certain time. Including that.

  In addition, while the load balancer distributes requests while avoiding application servers in which a GC is occurring, if the total number of requests per unit time is constant, the number of processing requests per application server increases. For this reason, the memory usage rate of the application server in which the GC has not occurred also changes compared to the first, so it is difficult for the application server side to predict the memory change of other application servers.

  The present invention eliminates the disadvantages of the prior art, distributes the memory usage using the memory cost value, and maintains the overall performance by distributing the trigger for the occurrence of Full GC with higher accuracy. An object of the present invention is to provide a SIP application server load balancer that can be operated and an operation method thereof.

  According to the present invention, in order to solve the above-described problems, a load balancer of a session initialization protocol (SIP) application server connected to a network includes a message receiving means for receiving a message from the network, A message analysis unit for analyzing information, a cost table management unit for preparing a correspondence relationship between a memory change amount and a memory cost value in advance as a cost table, and outputting a memory cost value corresponding to the analyzed message information, and an application server A memory table management means for managing the total value of each memory cost, a transfer processing means for determining an application server as a message transfer destination from the memory cost value and the memory cost total value information, and a message to the determined application server. Sending Characterized in that it comprises a message transmission means for.

  The operation method of the load balancer of the session initialization protocol (SIP) application server connected to the network includes a message receiving step of receiving a message from the network, a message analyzing step of analyzing information of the received message, a memory A correspondence table between the amount of change and the memory cost value is prepared in advance as a cost table, a cost table management process for outputting a memory cost value corresponding to the analyzed message information, and a total memory cost value for each application server is managed. A memory table management step, a transfer processing step for determining an application server that is a message transfer destination from the memory cost value and the total memory cost value information, and a message transmission step for transmitting a message to the determined application server Characterized in that it comprises a.

  Next, embodiments of a load balancer of a SIP application server according to the present invention will be described in detail with reference to the accompanying drawings.

  The load balancer configuration 100 of the present embodiment is configured to be divided into a client network compatible side and an application compatible side, as shown in FIG. 1, for example, and a message receiving unit and a message transmitting unit are installed separately. .

  First, the client network side will be described.

  The network message receiving unit 22 receives a message from the network to the application server side, and sends this received message to the message analyzing unit 24.

  The message analysis unit 24 transmits the transfer message information to the cost table management unit 26. Further, the memory cost value obtained from the cost table management unit 26 is transmitted to the transfer processing unit 28.

  For example, as shown in FIGS. 3 and 4, the cost table management unit 26 manages the correspondence between the transfer message information and the amount of change in the memory as a cost table based on an appropriate memory cost value obtained in advance through experiments or the like. Then, using this cost table, the memory cost value corresponding to the information sent from the message analysis unit 24 is selected and sent to the message analysis unit 24.

  The network transfer processing unit 28 sends the memory cost value information sent from the message analysis unit 24 to the memory table management unit 30, obtains the memory cost total value information from the memory table management unit 30, and transfers the message to which application server Decide what to do. This determination result is sent to the network message transmission unit 32.

  The memory table management unit 30 sends memory cost total value information for each application server to the network transfer processing unit 28 based on the memory cost value information from the network transfer processing unit 28. At the same time, the memory table management unit 30 manages information related to the memory for each application server, for example, as shown in the table of FIG. 5. For example, when a full GC occurs or restarts, the memory cost is reduced. Clear the total value.

  The network message transmission unit 32 transfers the message to the application server via the network based on the determination result sent from the network transfer processing unit 28.

  Next, the application corresponding side will be described.

  The application message receiving unit 42 receives a message from the application server to the opposite terminal or another SIP server, and sends this received message to the common message analyzing unit 24.

  The message analysis unit 24 analyzes the message sent from the application message receiving unit 42, and sends the analysis information directly to the application transfer processing unit 48.

  The application transfer processing unit 48 checks the opposite terminal or other SIP server from the analysis information sent from the message analysis unit 24, and sends it to the application message transmission unit 52.

  The application message transmission unit 52 transmits a message based on information from the application transfer processing unit 48.

  Next, the operation method of the load balancer 100 of the SIP application server in this embodiment will be described mainly with reference to the flowchart of FIG.

  First, a message is received by the network message receiving unit 22 from a network such as the Internet (S102).

  The received message is sent to the message analysis unit 24 for message analysis (S104).

  This analysis result is collated with a table as shown in FIG. 4 which is set and managed in advance in the cost table management unit 26, and a corresponding memory cost value is acquired (S106).

  Next, the application server selected so that the load is distributed by the network message transfer processing unit 28 is verified by the total cost value of each application server accumulated in the memory table management unit 30, for example, in order of increasing cost total value. That is, the application servers are selected again and determined in the order of the largest available memory area (S108).

  A message is transmitted from the network message transmitting unit 32 to the determined application server (S110).

  The memory table management unit 30 updates the total cost of the memory table for the application server to which the message is transmitted (S112).

  Next, another embodiment of the load balancer of the SIP application server according to the present invention, that is, the second embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and repeated description is avoided as much as possible.

  The load balancer 200 of the SIP application server according to the second embodiment sets the cost value of the cost table of the cost table management unit 26 based on the actual value obtained from the actual data exchange.

  As in the first embodiment, the client network compatible side and the application compatible side are configured separately. However, the client network compatible side has almost the same configuration as that of the first embodiment, so that the description thereof is omitted. Next, the configuration on the application corresponding side will be described.

  The application message receiving unit 42 receives a message from the application server to the opposite terminal or another SIP server and sends it to the common message analysis unit 24.

  The message analysis unit 24 analyzes the message sent from the application message receiving unit 42, sends the analysis information directly to the application transfer processing unit 48, and sends the memory information of the application server obtained from the received message to the cost calculation unit 44. Send it.

  The cost calculation unit 44 calculates a memory cost value based on the memory information of the application server sent from the message analysis unit 24 and sends it to the cost table management unit 46 on the client network side.

  Based on the memory cost value sent from the cost calculation unit 44, the cost table management unit 46 manages the correspondence between the transfer message information and the memory change amount as a cost table. Using this updated cost table, a memory cost value corresponding to the information sent from the message analysis unit 24 is selected and sent to the message analysis unit 24.

  Since the subsequent steps are the same as those in the first embodiment, they will be omitted.

  Next, the operation method of the SIP application server load balancer 200 in the second embodiment will be described mainly with reference to the flowchart of FIG. It should be noted that the same operation as that of the first embodiment is simplified to avoid repeated description as much as possible.

  First, a message is received by the network message receiving unit 22 from a network such as the Internet (S202) and sent to the message analysis unit 24 to analyze the message (S204).

  The analysis result is sent to the cost calculation unit 44, and the cost value is calculated from the memory information of the application server included in the message (S206).

  The calculated cost value is sent to the cost table management unit 46, and the cost table data is updated (S208).

  Thereafter, as in the first embodiment, application servers are distributed based on the updated cost table (S210).

  Here, an example of a SIP application server that transmits a message received by the load balancer will be described with reference to FIG.

  For example, the SIP application server 300 includes a message reception unit 62, an application execution unit 64, a memory management unit 66, and a message transmission unit 68.

  The message receiving unit 62 receives a message from the network and sends it to the application execution unit 64.

  The application execution unit 64 executes the application program based on the message sent from the message reception unit 62, and sends the program execution result to the message transmission unit 68.

  The memory management unit 66 acquires memory information such as the memory usage status in the application server and sends it to the message transmission unit 68.

  The message transmission unit 68 transmits a message including the program execution result sent from the application execution unit 64 and the memory information sent from the memory management unit 66 to the network.

  Next, the operation of the SIP application server will be described with reference to FIG.

  When the message reception unit 62 receives a message from a network such as the Internet (S302), a memory monitoring start instruction is issued to the memory management unit 66 (S304).

  Based on this start instruction, the memory management unit 66 stores the memory usage at that time (S306).

  The application is executed by the application execution unit 64 (S308), and when it is finished, a memory monitoring end instruction is issued to the memory management unit 66 (S310).

  Based on this end instruction, the memory management unit 66 calculates a memory difference between the memory usage at the end time and the memory usage at the start time stored (S312), and calculates the consumed memory amount. The

  The consumed memory information is embedded as a parameter value in the header of the SIP message, a SIP message having a header including the memory information is generated (S314), and transmitted from the message transmitting unit 68 (S316).

  Note that the message classification elements shown in FIG. 3 are merely examples, and other elements such as a message size may be added, or the classification elements may be narrowed down to increase the processing speed.

  Further, in the second embodiment, the memory information is not calculated by calculating the cost value every time based on the memory information from the application server, but by processing based on the cost value obtained in advance by attempting message transfer before the operation. It is also possible to reduce the load by omitting the calculation process.

  As described above, according to the first embodiment, the load balancer of the SIP application server distributes the memory usage, which is one of the triggers for the occurrence of GC, and as a result, almost no occurrence of Full GC can be avoided. And the overall performance efficiency can be maintained.

  Further, according to the second embodiment, even when a memory cost value cannot be set in advance or when a memory cost value with higher accuracy is used, a more accurate memory cost value can be obtained and distributed with higher accuracy. It is possible to provide a load balancer that can be controlled and can suppress the occurrence of Full GC as much as possible.

3 is a block diagram illustrating a load balancer according to an embodiment of the present invention. FIG. 2 is a layout diagram of a general SIP application server and load balancer. It is a figure of description of the load balancer by the Example of this invention. It is a figure of description of the load balancer by the Example of this invention. It is a figure of description of the load balancer by the Example of this invention. It is a flowchart which shows the operation | movement of the load balancer in the Example shown in FIG. 6 is a block diagram illustrating a load balancer according to another embodiment of the present invention. It is a flowchart which shows operation | movement of the load balancer in the Example shown in FIG. 6 is a block diagram illustrating a SIP application server according to another embodiment of the present invention. It is a flowchart which shows operation | movement of the SIP application server in the Example shown in FIG.

Explanation of symbols

100,200 load balancer
300 SIP application server
22 Network message receiver
24 Message analysis part
26,46 Cost table management department
28 Network transfer processor
30 Memory table manager
32 Network message transmitter
42 Application message receiver
44 Cost calculator
48 Application transfer processor
52 Application message transmitter
64 Application execution part
66 Memory management

Claims (5)

In a session initialization protocol (SIP) application server load balancer connected to a network, the load balancer
Message receiving means for receiving messages from the network;
Message analysis means for analyzing information of the received message;
A cost table management means for preparing a correspondence relationship between a memory change amount and a memory cost value in advance as a cost table, and outputting a memory cost value corresponding to the analyzed message information;
Memory table management means for managing the total memory cost for each application server;
Transfer processing means for determining a message transfer destination application server from the memory cost value and the memory cost total value information;
A load balancer for a SIP application server, comprising message transmission means for transmitting a message to the determined application server.   2. The load balancer of a SIP application server according to claim 1, wherein the cost table is obtained from a result of an experiment conducted in advance.   The SIP application according to claim 1, wherein the cost table is obtained by receiving a message from an application server, obtaining memory information from the message, and calculating a memory cost value from the memory information. Server load balancer.   4. The load balancer according to claim 3, wherein the application server receives a message from the network, executes an application program based on the message, acquires memory information after executing the program, and obtains the program execution result and the memory information. A load balancer of a SIP application server, characterized by transmitting a message including a message to the network. In a method of operating a load balancer of a session initialization protocol (SIP) application server connected to a network, the method comprises:
A message receiving process for receiving a message from the network;
A message analysis step of analyzing information of the received message;
A cost table management step of preparing a correspondence relationship between a memory change amount and a memory cost value as a cost table in advance, and outputting a memory cost value corresponding to the analyzed message information;
A memory table management process for managing the total memory cost for each application server;
A transfer processing step of determining an application server to which a message is transferred from the memory cost value and the memory cost total value information;
And a message transmission step of transmitting a message to the determined application server. A method of operating a load balancer of a SIP application server.

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