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https://issues.apache.org/jira/browse/HBASE-21508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698078#comment-16698078
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Duo Zhang commented on HBASE-21508:
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[~zghaobac] FYI.
> Ignore the reportRegionStateTransition call from a dead server
> --------------------------------------------------------------
>
> Key: HBASE-21508
> URL: https://issues.apache.org/jira/browse/HBASE-21508
> Project: HBase
> Issue Type: Sub-task
> Components: amv2
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
> Fix For: 3.0.0, 2.2.0
>
> Attachments: HBASE-21508-v1.patch, HBASE-21508-v2.patch,
> HBASE-21508.patch
>
>
> In our ITBLL test we observer a race between the SCP and TRSP which causes a
> region being assigned to two region servers.
> Not fully understand the scenario, but anyway, the we do not consider the
> situation in the old code, that after SCP gets the region list of a dead
> server, there could still be a reportRegionStateTransition call from dead
> server and mess up things.
> In general, I think we should have a fence in the AssignmentManager to
> prevent the reportRegionStateTransition from the dead servers to mess up the
> states.
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