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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1049) Master does not need to get tserver lock
Date Thu, 07 Feb 2013 21:15:12 GMT
Keith Turner created ACCUMULO-1049:
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             Summary: Master does not need to get tserver lock
                 Key: ACCUMULO-1049
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1049
             Project: Accumulo
          Issue Type: Bug
          Components: master
    Affects Versions: 1.4.0
            Reporter: Keith Turner
            Assignee: Eric Newton


Every tserver has a lock in zookeeper.  The master tries to get this lock and when it does
it assumes the tserver is dead.  It seems like this may no longer be necessary since changes
made in 1.3.  The master used to only keep track of ip and port to identify a tablet server.
 It needed to know when it got the lock to detect the difference between two tablet server
instances at the same ip and port.

Since 1.3 the master keeps distinctive info about a tablet server now and can detect the difference
between tablet server instances.  Making the master just monitor the current tablet server
locks instead of trying to get the lock would simplify the master code.  

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