Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm
Precedence: bulk
Reply-To: jira@apache.org
Date: Fri, 28 Sep 2012 06:37:07 +1100 (NCT)
From: "Eric Newton (JIRA)" <jira@apache.org>
To: notifications@accumulo.apache.org
Message-ID: <1350657762.135310.1348774627738.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (ACCUMULO-777) isLockHeld needs better
 bullet-proofing against transient errors
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Eric Newton created ACCUMULO-777:
------------------------------------

             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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira