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https://issues.apache.org/jira/browse/HBASE-20860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537945#comment-16537945
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Allan Yang commented on HBASE-20860:
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{quote}
Are we talking the MERGE_TABLE_REGIONS_UPDATE_META step Allan Yang ? If Master
dies, do we not rerun this step?
{quote}
Yes, the master will rerun this step. But before that, the new master will add
the merged regions to RIT regions(refer to my previous comment). When
MERGE_TABLE_REGIONS_UPDATE_META finished, though the meta entries for those
merged regions are cleaned, but RIT states are not.
{quote}
Would it be better not registering CLOSED regions as RIT when new master loads
the meta table (as per Duo Zhang). Thanks Allan Yang.
{quote}
Normally, if the region is marked as CLOSED, and no procedure is attached to
it, it is a bug, we need to treat it as RIT so we can see them form master web
clearly
> Merged region's RIT state may not be cleaned after master restart
> -----------------------------------------------------------------
>
> Key: HBASE-20860
> URL: https://issues.apache.org/jira/browse/HBASE-20860
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 3.0.0, 2.1.0, 2.0.1
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Major
> Fix For: 3.0.0, 2.1.0, 2.0.2
>
> Attachments: HBASE-20860.branch-2.0.patch
>
>
> In MergeTableRegionsProcedure, we issue UnassignProcedures to offline regions
> to merge. But if we restart master just after MergeTableRegionsProcedure
> finished these two UnassignProcedure and before it can delete their meta
> entries. The new master will found these two region is CLOSED but no
> procedures are attached to them. They will be regard as RIT regions and
> nobody will clean the RIT state for them later.
> A quick way to resolve this stuck situation in the production env is
> restarting master again, since the meta entries are deleted in
> MergeTableRegionsProcedure. Here, I offer a fix for this problem.
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