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PM96581: Thousands of CWOBJ7663W messages occuring in server logs

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APAR status

  • Closed as program error.

Error description

  • The WebSphere eXtreme Scale container log files contain
    thousands of occurrances of the message "CWOBJ7663W:
    Near-cache invalidation notification has been disconnected for
    grid <gridname>, map <mapname>, partition <n>, the near cache
    has been disabled". All grid function otherwise appears normal.

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of WebSphere eXtreme Scale that       *
    *                  require near cache invalidation and dynamic *
    *                  maps.                                       *
    * PROBLEM DESCRIPTION: Thousands of near-cache invalidation    *
    *                      notification messages (CWOBJ7663W)      *
    *                      output to the server logs.              *
    * RECOMMENDATION:                                              *
    When a WebSphere eXtreme Scale configuration includes support
    for near cache invalidation in addition to the use of
    dynamic maps (sometimes called template maps), some servers
    will generate many CWOBJ766W messages. It is important to
    note that the grid functions as expected when these messages
    are generated.
    For the servers that receive these messages, it indicates
    that there are not yet any transactions for the map indicated
    in the message. Therefore, the map has not yet dynamically
    been created on that server. The result is  that near cache
    invalidation is disconnected from the map in question, and
    that server attempts to try again later. The server continues
    to retry the cache invalidation processing for the map. The
    message repeats until the dynamic map is created. When the
    dynamic map gets created,  the near cache invalidation
    connection to the map is re-established.

Problem conclusion

  • The near cache invalidation process incorrectly expected
    that all dynamic maps are created on all servers immediately.
    This error is corrected.

Temporary fix


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  • PE




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Fix information

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Applicable component levels

  • R860 PSY


Document information

More support for: WebSphere eXtreme Scale

Software version: 860

Reference #: PM96581

Modified date: 13 September 2013

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