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https://issues.apache.org/jira/browse/HBASE-11659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085184#comment-14085184
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Virag Kothari commented on HBASE-11659:
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bq. We don't have the seq num in mem. I see. Probably no need.
So, checking if the region is opened on right region server is enough?
bq. That's good. The region server ignores the complain?
Yes. If the region is already closed, the region server doesn't do anything
> Region state RPC call is not idempotent
> ---------------------------------------
>
> Key: HBASE-11659
> URL: https://issues.apache.org/jira/browse/HBASE-11659
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Reporter: Virag Kothari
> Assignee: Virag Kothari
> Attachments: HBASE-11659.patch
>
>
> Here is the scenario on 0.98 with zk-less assignment
> The master gets an OPEN RPC call from region server.
> So, it moves the region state from PENDING_OPEN to OPEN.
> But, the call timeouts on the region server and region server retries sending
> the OPEN call. However, now the master throws an Exception saying the region
> is not PENDING_OPEN. So, the region servers aborts the region on receiving
> that exception and sends FAILED_OPEN to master. But the master cannot change
> its state from FAILED_OPEN to OPEN, so eventually the master keeps the state
> as OPEN while the actual region is no longer open on region server.
> The master should not throw an exception on receiving OPEN RPC calls multiple
> times.
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