Allan Yang updated HBASE-20878:
    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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