Cluster system, cluster member, and failure recovery method and program thereof

A cluster member which, among packets applied to a cluster system having the cluster member in question as a component, a packet included in a main processing range indicative of a range of main processing assigned to said cluster member in question or a sub-processing range indicative of a range of sub-processing, executes session processing including processing of recording and updating session information indicative of a state of a session of said packet, and when a cluster member in charge of main processing of a packet whose sub-processing is assigned to by the cluster member in question develops a failure, takes over the main processing of the packet of said cluster member under failure by using said recorded session information.

A failure recovery method of a cluster system formed of a plurality of cluster members, wherein each said cluster member,

• among packets applied to said cluster system, with respect to a packet included in a main processing range indicative of a range of main processing assigned to said cluster member or a sub-processing range indicative of a range of sub-processing, executes session processing including processing of recording and updating session information indicative of a state of a session of said packet, and
• when a cluster member in charge of main processing of a packet whose sub-processing is assigned to by the cluster member in question develops a failure, takes over the main processing of the packet of said cluster member under failure by using said recorded session information.

A computer-readable medium incorporating a program of instructions operable to control a computer to function as a cluster member of a cluster system, the program of instructions comprising:

• instructions to control said computer, among packets applied to the cluster system, with respect to a packet matching with a main processing range indicative of a range of main processing of which the cluster member in question takes charge or with a sub-processing range indicative of a range of sub-processing, to execute session processing including processing of recording and updating session information indicative of a state of a session to which the packet belongs, and
• instructions to control said computer, when a cluster member in charge of main processing of a packet whose sub-processing is taken charge of by the cluster member in question develops a failure, to take over the main processing of the packet of which said cluster member developing a failure takes charge by using said recorded session information.