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https://issues.apache.org/jira/browse/HBASE-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455915#comment-13455915
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Jimmy Xiang commented on HBASE-6776:
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regionsToAssign will remove those already online regions from the
regionsInMeta, then assign the rest of regions. That's what we want.
This could happen during unit test for sure, some man-made corruptions.
Another scenario could be because of racing between disabling
a table, and assigning the table without going through ZK.
> Opened region of disabled/enabling table is not added to online region list
> ---------------------------------------------------------------------------
>
> Key: HBASE-6776
> URL: https://issues.apache.org/jira/browse/HBASE-6776
> Project: HBase
> Issue Type: Bug
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Attachments: trunk-6776.patch
>
>
> For opened region of disabled table, it should be added to online region
> list, and then closed. We should not just ignore them.
> For opened region of enabling table, it should be added to online region
> list, so that we don't have to assign it again. Without adding it to online
> region list, it could be double assigned when assign it again later.
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