Ankit Singhal created HBASE-21440:
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Summary: Assign procedure on the crashed server is not properly
interrupted
Key: HBASE-21440
URL: https://issues.apache.org/jira/browse/HBASE-21440
Project: HBase
Issue Type: Bug
Reporter: Ankit Singhal
Assignee: Ankit Singhal
Fix For: 2.0.2
When the server crashes and it's SCP checks if there is already a procedure
assigning the region on this crashed server. If we found one, SCP will just
interrupt the already running AssignProcedure by calling remoteCallFailed which
just changes the region node state to OFFLINE and send the procedure back with
transition queue state for assignment with a new plan.
But, due to the race condition between the calling of the remoteCallFailed and
current state of the already running assign procedure(REGION_TRANSITION_FINISH:
where the region is already opened), it is possible that assign procedure goes
ahead in updating the regionStateNode to OPEN on a crashed server.
As SCP had already skipped this region for assignment as it was relying on
existing assign procedure to do the right thing, this whole confusion leads
region to a not accessible state.
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