Dan Hecht created IMPALA-7046:
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Summary: 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
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 other 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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