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https://issues.apache.org/jira/browse/HBASE-4726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143492#comment-13143492
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Madhuwanti Vaidya commented on HBASE-4726:
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This is the scenario we saw:
1. Region r is opened on RS1 and ZNode is updated with RS2ZK_REGION_OPENED.
2. But for some reason update to META takes a long time. (Not sure why yet)
3. hbck reports r is still unassigned - since update to META has not happened
yet.
4. hbck -fix is run.
5. Now master tries to assign r to RS2.
The following two happen simultaneously:
6a. Master now processes the old RS2ZK_REGION_OPENED update from RS1. This
updates META and clears ZK.
6a. RS2 onlines the r - but when it tries to set state to RS2ZK_REGION_OPENED,
it gets a ZK NoNodeException error.
> RS should close region if it fails to mark it as 'OPENED'.
> ----------------------------------------------------------
>
> Key: HBASE-4726
> URL: https://issues.apache.org/jira/browse/HBASE-4726
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.89.20100924
> Reporter: Madhuwanti Vaidya
> Assignee: Madhuwanti Vaidya
> Priority: Minor
>
> Currently if a RS fails to mark a region as 'OPENED' it only logs an error.
> It will leave the region open - this has caused duplicate region assignments
> in one of our production clusters.
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