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https://issues.apache.org/jira/browse/HBASE-20878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allan Yang updated HBASE-20878:
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Status: Patch Available (was: Open)
> Data loss if merging regions while ServerCrashProcedure executing
> -----------------------------------------------------------------
>
> Key: HBASE-20878
> URL: https://issues.apache.org/jira/browse/HBASE-20878
> Project: HBase
> Issue Type: Bug
> Components: amv2
> Affects Versions: 2.0.1, 3.0.0, 2.1.0
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Critical
>
> In MergeTableRegionsProcedure, we close the regions to merge using
> UnassignProcedure. But, if the RS these regions on is crashed, a
> ServerCrashProcedure will execute at the same time. UnassignProcedures will
> be blocks until all logs are split. But since these regions are closed for
> merging, the regions won't open again, the recovered.edit in the region dir
> won't be replay, thus, data will loss.
> I provided a test to repo this case. I seriously doubt Split region procedure
> also has this kind of problem. I will check later
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