OpenedRegionHandler racing with itself in ServerShutDownhandler flow leading to
HMaster abort
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Key: HBASE-4539
URL: https://issues.apache.org/jira/browse/HBASE-4539
Project: HBase
Issue Type: Bug
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
Steps to reproduce
==================
-> Region R1 is being opened in RS1.
->After processing the znode to OPENED RS1 goes down.
->Now before the OpenedRegionHandler executor deletes the znode if
ServerShutDownHandler tries to assign the region to RS2, RS2 transits the node
to OPENED and this OpenedRegionHandler executor deletes the znode.
->Now if the first OpenedRegionHandler tries deleting the znode it throws
NoNode Exception and causes the HMaster to abort.
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