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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-777) isLockHeld needs better bullet-proofing against transient errors
Date Thu, 27 Sep 2012 19:37:07 GMT
Eric Newton created ACCUMULO-777:
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             Summary: isLockHeld needs better bullet-proofing against transient errors
                 Key: ACCUMULO-777
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-777
             Project: Accumulo
          Issue Type: Bug
          Components: client
    Affects Versions: 1.3.5, 1.4.0, 1.3.6, 1.4.1
         Environment: medium sized cluster
            Reporter: Eric Newton
            Assignee: Eric Newton
             Fix For: 1.4.2, 1.4.1


During the minor compaction, the zookeeper lock for the tablet server is double-checked prior
to updating the METADATA table information.  In one unlucky moment, the zookeeper connection
was lost during this check.  The tablet server failed the check, but the lock was not lost.
 As a result, the root tablet remained hosted for another 4 weeks, but did not flush mutations
to disk.  When memory filled, the operator noticed a long hold time and killed the server.
 This caused a log recovery of 98 1G of logs, some of which were very old.

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