Michael Stack created HBASE-24015:
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Summary: Coverage for Assign and Unassign of Regions on
RegionServer on failure
Key: HBASE-24015
URL: https://issues.apache.org/jira/browse/HBASE-24015
Project: HBase
Issue Type: Bug
Components: amv2
Reporter: Michael Stack
Looking at 'HBASE-23984 [Flakey Tests] TestMasterAbortAndRSGotKilled fails in
teardown', and at UnassignRegionHandler, AssignRegionHandler,
CloseRegionHandler, and the work that is done inline w/ request vs that which
to the side in executors, we need more coverage and specification of what
happens around the edges. This coverage would be more to see if holes in our
handling currently in a unit test case context before we see it out on clusters.
HBASE-23984 addresses holes where UnassignRegionHandler and
AssignRegionHandler could skip out w/o clearing Regions from the
RegionServer#regionsInTransitionInRS Map of Regions In Transition if failed
open or close because the RegionServer is aborting.
Other holes seem lurking. On exception, we were leaving entries in the
RegionServer# submittedRegionProcedure map added by HBASE-2204; not the end of
the world but they should be cleared on error? HBASE-23984 adds clearning from
submittedRegionProcedure but then procedures even if failed get added to the
cache of procedures... so if we try to run the procedure again against this
server it won't be scheduled.
interesting stuff.
This issue is about adding tests that fail assign/unassign/close on the
RegionServer side making sure RS state is left in a good condition on fail.
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