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https://issues.apache.org/jira/browse/HBASE-18491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109645#comment-16109645
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Stephen Yuan Jiang commented on HBASE-18491:
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Looks good.
> [AMv2] Fail UnassignProcedure if source Region Server is not online.
> --------------------------------------------------------------------
>
> Key: HBASE-18491
> URL: https://issues.apache.org/jira/browse/HBASE-18491
> Project: HBase
> Issue Type: Bug
> Components: amv2
> Affects Versions: 2.0.0
> Reporter: Umesh Agashe
> Assignee: Umesh Agashe
> Fix For: 2.0.0
>
> Attachments: hbase-18491.master.001.patch
>
>
> Currently UnassignProcedure returns success when server carrying a region is
> NOT online. Assumption here is that ServerCrashProcedure will handle
> splitting logs etc for these regions. When UnassignProcedure completes,
> MoveRegionProcedure resumes with AssignProcedure. AssignProcedure can some
> times assign regions without pre-requisite steps (done either by
> UnassignProcedure or ServerCrashProcedure). Fix is to fail UnassignProcedure
> and parent MoveRegionProcedure if source server is not online.
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