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https://issues.apache.org/jira/browse/HBASE-20878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541804#comment-16541804
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Allan Yang commented on HBASE-20878:
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[~Apache9], you can see my patch, my solution is to check whether the closed
region was on a dead server, if it is, then abort the merge procedure. I think
this can work.
> 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: 3.0.0, 2.1.0, 2.0.1
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Critical
> Attachments: HBASE-20878.branch-2.0.001.patch
>
>
> 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 blockd 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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