Method and apparatus for relay control and computer product

• US 20050193107A1
• Filed: 07/26/2004
• Published: 09/01/2005
• Est. Priority Date: 03/01/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tsuchiya, Satoshi, Shimojima, Kazuki, Sonoda, Masataka, Sekiguchi, Atsuji
• Granted Patent: US 7,720,949 B2
• Time in Patent Office: Days
• US Class Current: 709/223
• 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 67/1012 based on compliance of requirements or conditions with available server resources

Abstract

A relay control apparatus is arranged between clients and a CoD system. The relay control apparatus accepts process requests from the clients and stores the process requests. If the CoD system is installing a server in addition to existing servers, the relay control apparatus provides a control so that requests unprocessable with the existing servers are not passed to the CoD system until the installation of the server is completed. When the installation of the server is completed, servers that can process, within a predetermined period, a volume of requests at that time and a volume of requests retained by that time are secured.

Claims

1. A relay control method for relaying a process request to an information processing system that dynamically installs an additional server in addition to an existing server according to a volume of process requests from a client, comprising:

determining whether the information processing system is installing the additional server;

relaying the process request received from the client to the information processing system when it is determined at the determining that the information processing system is not installing the additional server; and

relaying only a process request processable by the existing server from among process requests received from the client to the information processing system when it is determined at the determining that the information processing system is installing the additional server.

2. The relay control method according to claim 1, further comprising:

estimating the volume of the process requests from the client;

calculating number of the additional servers required at a specific time in future from the volume of the process requests estimated at the estimating; and

reporting the number of the additional servers calculated at the calculating to the information processing system.

3. The relay control method according to claim 2, wherein the calculating includes calculating the number of the additional servers as a sum of

number of additional servers at the specific time required for processing within a predetermined period process requests received from the client, and

number of additional servers required for processing within the predetermined period process requests received from the client and yet not relayed to the information processing system by a specific time.

4. The relay control method according to claim 3, wherein

the predetermined time is shorter than a timeout time of an application on the client.

5. A computer program that includes instructions which when executed on a computer causes the computer to relay a process request to an information processing system that dynamically installs an additional server in addition to an existing server according to a volume of process requests from a client, the computer program causing the computer execute:

determining whether the information processing system is installing the additional server;

relaying the process request received from the client to the information processing system when it is determined at the determining that the information processing system is not installing the additional server; and

relaying only a process request processable by the existing server from among process requests received from the client to the information processing system when it is determined at the determining that the information processing system is installing the additional server.

6. The computer program according to claim 5, further causes the computer to execute:

estimating the volume of the process requests from the client;

calculating number of the additional servers required at a specific time in future from the volume of the process requests estimated at the estimating; and

reporting the number of the additional servers calculated at the calculating to the information processing system.

7. The computer program according to claim 6, wherein the calculating includes calculating the number of the additional servers as a sum of

number of additional servers at the specific time required for processing within a predetermined period process requests received from the client, and

number of additional servers required for processing within the predetermined period process requests received from the client and yet not relayed to the information processing system by a specific time.

8. The computer program according to claim 7, wherein

the predetermined time is shorter than a timeout time of an application on the client.

9. A relay control device that relays a process request to an information processing system that dynamically installs an additional server in addition to an existing server according to a volume of process requests from a client, comprising:

a determining unit that determines whether the information processing system is installing the additional server;

a first relaying unit that relays the process request received from the client to the information processing system when it is determined by the determining unit that the information processing system is not installing the additional server; and

a second relaying unit that relays only a process request processable by the existing server from among process requests received from the client to the information processing system when it is determined by the determining unit that the information processing system is installing the additional server.

10. The relay control device according to claim 9, further comprising:

an estimating unit that estimates the volume of the process requests from the client;

a calculating unit that calculates number of the additional servers required at a specific time in future from the volume of the process requests estimated at the estimating; and

a reporting unit that reports the number of the additional servers calculated at the calculating to the information processing system.

11. The relay control device according to claim 10, wherein the calculating unit calculates the number of the additional servers as a sum of

number of additional servers at the specific time required for processing within a predetermined period process requests received from the client, and

number of additional servers required for processing within the predetermined period process requests received from the client and yet not relayed to the information processing system by a specific time.

12. The relay control device according to claim 11, wherein

the predetermined time is shorter than a timeout time of an application on the client.

13. A computer-readable recording medium that contains a computer program that includes instructions which when executed on a computer causes the computer to relay a process request to an information processing system that dynamically installs an additional server in addition to an existing server according to a volume of process requests from a client, the computer program causing the computer execute:

determining whether the information processing system is installing the additional server;

relaying the process request received from the client to the information processing system when it is determined at the determining that the information processing system is not installing the additional server; and

relaying only a process request processable by the existing server from among process requests received from the client to the information processing system when it is determined at the determining that the information processing system is installing the additional server.

14. The computer-readable recording medium according to claim 13, wherein the computer program further causes the computer to execute:

estimating the volume of the process requests from the client;

calculating number of the additional servers required at a specific time in future from the volume of the process requests estimated at the estimating; and

reporting the number of the additional servers calculated at the calculating to the information processing system.

15. The computer-readable recording medium according to claim 14, wherein the calculating includes calculating the number of the additional servers as a sum of

number of additional servers at the specific time required for processing within a predetermined period process requests received from the client, and

number of additional servers required for processing within the predetermined period process requests received from the client and yet not relayed to the information processing system by a specific time.

16. The computer-readable recording medium according to claim 15, wherein

the predetermined time is shorter than a timeout time of an application on the client.