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https://issues.apache.org/jira/browse/HBASE-20976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allan Yang updated HBASE-20976:
-------------------------------
    Status: Patch Available  (was: Open)

> SCP can be scheduled multiple times for the same RS
> ---------------------------------------------------
>
>                 Key: HBASE-20976
>                 URL: https://issues.apache.org/jira/browse/HBASE-20976
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.1, 2.1.0
>            Reporter: Allan Yang
>            Assignee: Allan Yang
>            Priority: Major
>
> SCP can be scheduled multiple times for the same RS:
> 1. a RS crashed, a SCP was submitted for it
> 2. before this SCP finish, the Master crashed
> 3. The new master will scan the meta table and find some region is still open 
> on a dead server
> 4. The new master submit a SCP for the dead server again
> The two SCP for the same RS can even execute concurrently if without 
> HBASE-20846…
> Provided a test case to reproduce this issue and a fix solution in the patch.



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