Deneche A. Hakim created DRILL-4676:
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Summary: Foreman.moveToState can block forever if called by the
foreman thread while the query is still being setup
Key: DRILL-4676
URL: https://issues.apache.org/jira/browse/DRILL-4676
Project: Apache Drill
Issue Type: Bug
Components: Execution - Flow
Affects Versions: 1.6.0
Reporter: Deneche A. Hakim
Assignee: Deneche A. Hakim
Fix For: 1.7.0
When the query is being setup, foreman has a special CountDownLatch that blocks
rpc threads from delivering external events, this latch is unblocked at the end
of the query setup.
In some cases though, when the foreman is submitting remote fragments, a
failure in RpcBus.send() causes an exception to be thrown that is reported to
Foreman.FragmentSubmitListener and blocks in the CountDownLatch. This causes
the foreman thread to block forever, and can rpc threads to be blocked too.
This seems to happen more frequently at a high concurrency load, and also can
prevent clients from connecting to the Drillbits.
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