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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7103) Need to fail split if SPLIT znode is deleted even before the split is completed.
Date Sun, 11 Nov 2012 04:59:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494826#comment-13494826
] 

stack commented on HBASE-7103:
------------------------------

I'd be good w/ applying the revert patch for now -- would be interested in what you say to
the above first though Ram and who knows, maybe the zk fellas will come back w/ a little bit
of magic
                
> Need to fail split if SPLIT znode is deleted even before the split is completed.
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-7103
>                 URL: https://issues.apache.org/jira/browse/HBASE-7103
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.94.3, 0.96.0
>
>         Attachments: 7103-6088-revert.txt, HBASE-7103_testcase.patch
>
>
> This came up after the following mail in dev list
> 'infinite loop of RS_ZK_REGION_SPLIT on .94.2'.
> The following is the reason for the problem
> The following steps happen
> -> Initially the parent region P1 starts splitting.
> -> The split is going on normally.
> -> Another split starts at the same time for the same region P1. (Not sure why this
started).
> -> Rollback happens seeing an already existing node.
> -> This node gets deleted in rollback and nodeDeleted Event starts.
> -> In nodeDeleted event the RIT for the region P1 gets deleted.
> -> Because of this there is no region in RIT.
> -> Now the first split gets over.  Here the problem is we try to transit the node
to SPLITTING to SPLIT. But the node even does not exist.
> But we don take any action on this.  We think it is successful.
> -> Because of this SplitRegionHandler never gets invoked.

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