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https://issues.apache.org/jira/browse/HBASE-22631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873794#comment-16873794
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yuhuiyang commented on HBASE-22631:
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[~allan163] step1 : Region A closed due to HDFS problem in origional
regionserver in my case and A was assignde to the other regionservers with a
AssignProcedure submitted . For example A was planned to be assigned to
regionserver rs1 ,and rs1 failed to open region A too as the same HDFS problem
. So the reigon A will be requeued several time until be OPENED(for example
rs2). A was split and deleted by GCRegionProcedure later.
step2 : The rs1 crashed and a ServerCrashProcedure procrs1
was created . Procrs1 would get the region A from serverMap when the
procedure get regions (state = SERVER_CRASH_GET_REGIONS).
step3: Procrs1 will create a subProcedure AssignProcedure
for region A, so the gced region A will appear and be write to hbase:meta
、HDFS.
> assign failed may make gced parent region appear again !!!
> ----------------------------------------------------------
>
> Key: HBASE-22631
> URL: https://issues.apache.org/jira/browse/HBASE-22631
> Project: HBase
> Issue Type: Bug
> Components: proc-v2
> Affects Versions: 2.1.1
> Reporter: yuhuiyang
> Priority: Major
> Attachments: HBASE-22631-branch-2.1.01.patch
>
>
> When i assign a region A the process is as follows：
> step1 : A is assigned to rs1 , and rs1 fails to open it .
> step2 : assignProcedure handleFailure .
> step3 : A is assign to rs2 and rs success to open it .
> Above is the normal flow . However when rs1 is restart after the reigon A was
> split and GCRegionProcedure was successed , the region A appare again !
> The region is that reigon A is not removed from the serverMap correctly when
> assignprocedure handleFailure . Because the code regionNode.offline() make
> the regionNode's regionLocation to be null and make regionNode's state to
> OFFLINE . So when the code
> env.getAssignmentManager().undoRegionAsOpening(regionNode) do nothing . So
> when the rs1 restart event triggers a serverCrashProcedure, it will get
> reigons from serverMap and it will get the region A then A will be assigned
> and hdfs dir will be created.
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