Nick Dimiduk created HBASE-23836:
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Summary: Race condition in Master startup can ignore shutdown RPC
Key: HBASE-23836
URL: https://issues.apache.org/jira/browse/HBASE-23836
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 3.0.0
Reporter: Nick Dimiduk
Identified as the root-cause of HBASE-23808. The master starts its RPC server
first thing in its constructor, but does not initialize it's {{clusterTracker}}
until later (both from the super constructor). Thus it is possible for a client
to issue a {{shutdown}} RPC is received by a master before it has a
clusterTracker instance. It is highly likely (guaranteed?) to also not be the
active master at this point. In such a case, the {{shutdown}} is received and
acknowledged back to the client, but is effectively ignored.
After chatting with [~bharathv] on the PR, we believe this race becomes more
likely (though still rare) after HBASE-18095. This is something to consider
should we get around to a startup sequence refactor.
Setting priority as "minor" because the condition is merely annoying; from what
I can tell, a subsequent {{shutdown}} RPC to any master would result in the
correct shutdown of the first.
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