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PK96690: REORG AND CLEANUP DEAMON CAUSE SEARCH COLLECTION CORRUPTION

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APAR status

  • Closed as program error.

Error description

  • Reorg and Cleanup Deamon cause Search Collection Corruption
    We know that two processes cause index corruption.
    Cleanup daemon that runs by default at night. Or 2 hours before
    midnight? So
    indexing will interfere with cleanup daemon.
    Cleanup daemon marks expired documents and broken links
     document
    as deleted.
    Another process is reorg() that actually happens when you have
    more
    than 1000 deleted documents, it deletes all these documents
     from
    the
    index. When both run simultaneously despite wheather a crawl is
    running will corrupt the collection.
    

Local fix

  • We changed code logic. Since we know that reorg and cleanup
    cause
    corruption when they run together. We avoid such scenarios by
    running
    reorg after cleanup process is over. And reorg will run only if
    number
    of deleted documents is greater than 10% of the indexed
    documents, to
    reduce load on the index, reorg() is pretty heavy procedure. If
    we run
    it on more than 20% of indexed documents, it could cause
    performance
    issues. So we have made those changes in the new webscanner.jar
    

Problem summary

  • Collection is corrupted because of reorg process failure
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    PK96690

  • Reported component name

    WEBSPHERE PORTA

  • Reported component ID

    5724E7600

  • Reported release

    60H

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-09-21

  • Closed date

    2009-12-03

  • Last modified date

    2010-06-07

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    WEBSPHERE PORTA

  • Fixed component ID

    5724E7600

Applicable component levels

  • R601 PSY

       UP

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Document Information

Modified date:
07 June 2010