Communication data relay system and method

• US 20060133371A1
• Filed: 04/06/2005
• Published: 06/22/2006
• Est. Priority Date: 12/20/2004
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Matoba, Kazumine
• Application Number:
  US11/100,371
• Publication Number:
  US 20060133371A1
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/1017 based on a round robin mechanism
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1027 Persistence of sessions during load balancing

Abstract

The present invention relates to a relay system that is capable of relaying communication data at high speed. There is provided a relay system that is formed by one or more servers having the same application and a client and relays communication data transmitted from the client to one of the servers, the relay system including a preceding apparatus connected to the client and a succeeding apparatus connected to the one or more servers, in which the preceding apparatus extracts predetermined data from obtained communication data, sets predetermined field data corresponding to the predetermined data in frames, and transmits the frames, and the succeeding apparatus extracts predetermined field data from frames transmitted from the preceding apparatus and determines a relay destination server corresponding to the predetermined field data from among the servers connected to the succeeding apparatus.

Claims

1. A relay system relaying communication data transmitted from a client when the client requests provision of an application to one of one or more servers in a network, the network being formed by the one or more servers having the same application and the client, the communication data being exchanged between the client and the one or more servers by being divided into one or more frames, the relay system including

a preceding apparatus connected to the client and

a succeeding apparatus connected to the one or more servers,

the preceding apparatus comprising:

an obtainment unit obtaining the communication data from the one or more frames transmitted from the client;

an extraction unit extracting predetermined data from the obtained communication data;

a determination unit determining predetermined field data corresponding to the predetermined data; and

a transmission unit setting the predetermined field data in the one or more frames and transmitting the set one or more frames,

the succeeding apparatus comprising;

a succeeding extraction unit receiving the one or more frames transmitted from the preceding apparatus and extracting the predetermined field data from the received one or more frames;

a relay destination determination unit determining a relay destination server corresponding to the extracted predetermined field data from among the one or more servers connected to the succeeding apparatus; and

a transmission destination change unit changing a destination of the one or more frames received from the preceding apparatus to an address of the determined relay destination server and transmitting the changed one or more frames.

2. A relay system according to claim 1, wherein the determination unit determines predetermined second field data in a case where it is impossible to extract the predetermined data from the obtained communication data, and

the relay destination determination unit determines a relay destination server under a predetermined rule from among the one or more servers connected to the succeeding apparatus when judging that the extracted predetermined field data is the predetermined second field data.

3. A relay system according to claim 1, the succeeding apparatus further comprising

a transfer unit transferring the received one or more frames to the preceding apparatus when the received one or more frames are not frames transmitted from the preceding apparatus.

4. A relay system according to claim 1, the relay system including a plurality of succeeding apparatuses,

the preceding apparatus further comprising

a succeeding selection unit selecting a succeeding apparatus serving as a transfer destination from among the plurality of succeeding apparatuses based on the predetermined data extracted by the extraction unit,

wherein the transmission unit sets the predetermined field data in the one or more frames, changes a destination of the one or more frames to an address of the selected succeeding apparatus, and transmits the changed one or more frames.

5. A relay system according to claim 1,

the preceding apparatus further comprising:

a correspondence table holding unit holding a correspondence table showing correspondence between the predetermined data and the predetermined field data, the correspondence table being referred by the determination unit when determining the predetermined field data; and

a correspondence table change unit changing contents of the correspondence table.

6. A relay system according to claim 1,

the preceding apparatus further comprising:

an extraction rule holding unit holding an extraction rule, the extraction rule being for extracting the predetermined data from the communication data and being referred to by the extraction unit when extracting the predetermined data; and

a rule change unit changing contents of the extraction rule.

7. A relay system according to claim 1, wherein

the determination unit determines a plurality of pieces of predetermined field data corresponding to the predetermined data,

the transmission unit sets the plurality of pieces of predetermined field data in the one or more frames and transmits the set one or more frames,

the succeeding extraction unit extracts the plurality of pieces of predetermined field data from the received one or more frames, and

the relay destination determination unit determines a relay destination server corresponding to the extracted plurality of pieces of predetermined field data from among the one or more servers connected to the succeeding apparatus.

8. A relay method relaying communication data transmitted from a client when the client requests provision of an application to one of one or more servers in a network, the network being formed by the one or more servers having the same application and the client, the communication data being exchanged between the client and the one or more servers by being divided into one or more frames,

preceding steps done by an apparatus connected to the client, the preceding steps comprising the steps of:

obtaining the communication data from the one or more frames transmitted from the client;

extracting predetermined data from the obtained communication data;

determining predetermined field data corresponding to the predetermined data;

setting the predetermined field data in the one or more frames; and

transmitting the set one or more frames,

succeeding steps done by an apparatus connected to the one or more servers, the succeeding steps comprising the steps of;

receiving the one or more frames transmitted from the preceding apparatus and extracting the predetermined field data from the received one or more frames;

determining a relay destination server corresponding to the extracted predetermined field data from among the one or more servers connected to the succeeding apparatus;

changing a destination of the one or more frames received from the preceding apparatus to an address of the determined relay destination server; and

transmitting the changed one or more frames.