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https://issues.apache.org/jira/browse/HBASE-18984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210573#comment-16210573
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ramkrishna.s.vasudevan commented on HBASE-18984:
------------------------------------------------
{code}
// No need to update meta here, and this is the only place we set regionNode as
OPENING
1438 // If master crashed before #markRegionAsOpened() (where we set
region as OPEN in meta)
1439 // And after master is restarted, this region maybe reloaded and
assigned when master do bulk assign.
1440 // So there are might be 2 AssignProcedures for this region. One
is created by master when bulk
1441 // assign, the other is the one failed before master crashed. But
there can only be one
1442 // AssignProcedure per region running at a time since each
procedure takes a lock on the region.
1443 // No matter which one AssignProcedure succeed, the the other
will fail, and wont affect others.
{code}
I have not fully checked the flow because of this impact. But before I could
just asking - so you have now not updating the META with OPENING state. So the
code that was working by reading the META and checking this OPENING state has
been removed now? I mean here in the comment you talk about master going down
but what about the RS going down while OPENING? Yes I agree that in that case
anyway a new node has to be assigned for the region. Will check the patch and
the flow and will be back here.
> [AMv2] Retain assignment does not work well in AMv2
> ---------------------------------------------------
>
> Key: HBASE-18984
> URL: https://issues.apache.org/jira/browse/HBASE-18984
> Project: HBase
> Issue Type: Bug
> Components: proc-v2
> Affects Versions: 2.0.0
> Reporter: Yi Liang
> Assignee: Yi Liang
> Fix For: 2.0.0
>
> Attachments: HBASE-18984-V1-master.patch, Screen Shot 2017-10-10 at
> 2.24.19 PM.png
>
>
> work on 8.17 Retain assignment in
> https://docs.google.com/document/d/1eVKa7FHdeoJ1-9o8yZcOTAQbv0u0bblBlCCzVSIn69g/edit#heading=h.epjn9nege80k
> To reproduce this error, in hbase shell:
> createTable t1 --> list_regions 't1' --> disable 't1' ---> enable 't1' -->
> list_reigons 't1' (maybe you need to try enable/disable multiple times)
> See attached images. same region assigned to different region servers
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