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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8133) avoid assign for disabling table regions(OPENING/PENDING_OPEN) in SSH
Date Mon, 18 Mar 2013 05:02:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604871#comment-13604871

ramkrishna.s.vasudevan commented on HBASE-8133:

bq.Lets suppose a region is moving from RS1 to RS2 and it is in OPENING/PENDING_OPEN then
master recieved disable table call. If RS2 went down after setting DISABLING state then we
are unnessarily assigning and then unassigning the regions in SSH.
This we can solve using table locks then.  Enis was asking if we need to use table locks for
the region balancing also.  May be we need them so that this race itself is avoided at the
first level.
> avoid assign for disabling table regions(OPENING/PENDING_OPEN) in SSH
> ---------------------------------------------------------------------
>                 Key: HBASE-8133
>                 URL: https://issues.apache.org/jira/browse/HBASE-8133
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 0.95.0
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>             Fix For: 0.98.0
> Disabling table regions which are in PENDING_OPEN or OPENING on dead server are getting
assigned then unassiging. 
> We can avoid this by just mark OFFLINE for the regions,any way znodes of the transitions
got deleted as part of am.processServerShutdown(serverName). 

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