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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6046) Master retry on ZK session expiry causes inconsistent region assignments.
Date Thu, 31 May 2012 04:23:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286305#comment-13286305
] 

ramkrishna.s.vasudevan commented on HBASE-6046:
-----------------------------------------------

We are working on a fix.  It is almost HMaster.finishInitialization() but not fully.  I think
it is necessary to do that so that the split log of the RS that has gone down during this
time can be done.  Otherwise that goes unnoticed.
                
> Master retry on ZK session expiry causes inconsistent region assignments.
> -------------------------------------------------------------------------
>
>                 Key: HBASE-6046
>                 URL: https://issues.apache.org/jira/browse/HBASE-6046
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.92.1, 0.94.0
>            Reporter: Gopinathan A
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.92.2, 0.94.1
>
>
> 1> ZK Session timeout in the hmaster leads to bulk assignment though all the RSs are
online.
> 2> While doing bulk assignment, if the master again goes down & restart(or backup
comes up) all the node created in the ZK will now be tried to reassign to the new RSs. This
is leading to double assignment.
> we had 2800 regions, among this 1900 region got double assignment, taking the region
count to 4700. 

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