International Business Machines Corporation

Jifang Zhang

Myung Mun Bae

Peter Richard Badovinatz

A distributed system has a multiplicity of nodes. A group of the nodes subscribe to a group services process. The group is subject to dissolving. A list of persistent subscribers to the group is maintained. Subscriptions to members and states of the group that are persistent subscribers do not terminate in response to the group being dissolved. The persistent subscribers automatically receive a notice in response to the group being reestablished and do not need to re-subscribe to the group.

Persistent group membership in a distributing computing system

Persistent group membership in a distributed computing system

A system and method for controlling log files is provided in which each log file entry is associated with an importance level. Depending on the importance level, the log entry is stored in a separately maintained set of files which can thus be rotated on different schedules so that the more important log file entries are retained for appropriately longer periods of time so as to be better able to reconstruct event histories and reports for important events.

System and method for granular control of message logging

In a multinode data processing system, the messages to be transmitted from node to node, per the request of an application program, are stored in a queue on one of the nodes. Acknowledgment of the receipt of the messages is used to control transmission of messages at future times by adjusting the maximum number of allowable messages to be sent from the queue and also by adjusting the time interval that the system waits before retransmitting unacknowledged messages. This permits the use of so-called 'unreliable' messaging protocols and relieves application programs and programmers from the burden of employing more complicated protocols.

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Jifang Zhang