Viraj Jasani created HBASE-26596:
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Summary: region_mover should gracefully ignore null response from
RSGroupAdmin#getRSGroupOfServer
Key: HBASE-26596
URL: https://issues.apache.org/jira/browse/HBASE-26596
Project: HBase
Issue Type: Bug
Components: mover, rsgroup
Affects Versions: 1.7.1
Reporter: Viraj Jasani
If regionserver has any non-daemon thread running even after it's own shutdown,
the running non-daemon thread can prevent clean JVM exit and regionserver could
be stuck in the zombie state. We have recently provided a workaround for this
in HBASE-26468 for regionserver exit hook to wait 30s for all non-daemon
threads to get stopped before terminating JVM abnormally.
However, if regionserver is stuck in such state, region_mover unload fails with:
{code:java}
NoMethodError: undefined method `getName` for nil:NilClass
getSameRSGroupServers at /bin/region_mover.rb:503
__ensure__ at /bin/region_mover.rb:313
unloadRegions at /bin/region_mover.rb:310
(root) at /bin/region_mover.rb:572
{code}
This happens if the cluster has RSGroup enabled and the given server is already
stopped, hence RSGroupAdmin#getRSGroupOfServer would return null (as the server
is not running anymore so it is not part of any RSGroup). region_mover should
ride over this null response and gracefully exit from unloadRegions() call.
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