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https://issues.apache.org/jira/browse/IMPALA-7046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-7046 started by Dan Hecht.
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> Add targeted regression test for race in IMPALA-7033
> ----------------------------------------------------
>
> Key: IMPALA-7046
> URL: https://issues.apache.org/jira/browse/IMPALA-7046
> Project: IMPALA
> Issue Type: Task
> Components: Backend
> Affects Versions: Impala 3.1.0
> Reporter: Dan Hecht
> Assignee: Dan Hecht
> Priority: Major
>
> I'd like to add a regression test to trigger the race in IMPALA-7033 more
> reliably, but it will involve doing some sleeps at specific places, so I'd
> like to add it after [~bikramjeet.vig] commits a change that provides some
> infrastructure for that.
> The race was:
> 1) Coordinator::Exec() takes the QueryState ExecResources reference count.
> 2) Coordinator sends out exec rpc to non-coordinator backend.
> 3) Some non-coordinator backend sends a failure report which invokes
> HandleExecStateTransition, which drops the coordinator's reference to the
> exec resources.
> 4) Coordinator sends out exec rpc to coordinator backend, which takes the
> exec resources reference and releases it. We don't expect the reference count
> to become non-zero after it has already gone through a cycle.
> The fix for this race is included in [https://gerrit.cloudera.org/#/c/10440]
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