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https://issues.apache.org/jira/browse/HBASE-19989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363081#comment-16363081
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Ben Lau commented on HBASE-19989:
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Hi Ted, thanks for the feedback, I'm not sure a comment will be helpful since
it comes down to 'if the break is here the code below doesn't run, so the break
is not here' but I have added a comment anyway and re-added the ZKLess
split/merge tests that were removed in branch-1. Let me know your thoughts,
thanks.
> READY_TO_MERGE and READY_TO_SPLIT do not update region state correctly
> ----------------------------------------------------------------------
>
> Key: HBASE-19989
> URL: https://issues.apache.org/jira/browse/HBASE-19989
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.1, 1.4.1
> Reporter: Ben Lau
> Assignee: Ben Lau
> Priority: Major
> Attachments: HBASE-19989.patch, HBASE-19989.patch
>
>
> Region state transitions do not work correctly for READY_TO_MERGE/SPLIT.
> [~thiruvel] and I noticed this is due to break statements being in the wrong
> place in AssignmentManager. This allows a race condition for example in
> which one of the regions being merged could be moved concurrently, resulting
> in the merge transaction failing and then double assignment and/or dataloss.
> This bug appears to only affect branch-1 (for example 1.3 and 1.4) and not
> branch-2 as the relevant code in AM has since been rewritten.
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