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Date: Fri, 15 Feb 2013 20:55:12 +0000 (UTC)
From: "Eric Newton (JIRA)" <jira@apache.org>
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Message-ID: <JIRA.12631338.1360271663361.294943.1360961712512@arcas>
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Subject: [jira] [Commented] (ACCUMULO-1049) Master does not need to get
 tserver lock
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    [ https://issues.apache.org/jira/browse/ACCUMULO-1049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579497#comment-13579497 ] 

Eric Newton commented on ACCUMULO-1049:
---------------------------------------

The master seems to not notice when tablet servers go away.  I have to restart it.

I'm testing using the continuous ingest test, killing 1-3 servers every 2 5 minutes with 2 minutes between restarts.

                
> Master does not need to get tserver lock
> ----------------------------------------
>
>                 Key: ACCUMULO-1049
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1049
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: master
>    Affects Versions: 1.4.0
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>             Fix For: 1.5.0, 1.4.3
>
>
> 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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