Deneche A. Hakim created DRILL-2878:
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Summary: FragmentExecutor.closeOutResources() is not called if an
exception happens in the Foreman before the fragment executor starts running
Key: DRILL-2878
URL: https://issues.apache.org/jira/browse/DRILL-2878
Project: Apache Drill
Issue Type: Bug
Components: Execution - Flow
Reporter: Deneche A. Hakim
Assignee: Chris Westin
When the Foreman sets up the root FragmentExecutor and it needs to wait for
data from the remote fragments, the fragment manager is recorded in the work
bus and the root fragment executor is not run immediately.
If an exception happens in the Foreman while setting up the remote fragments,
the Foreman cancels all fragments and returns a FAILED message to the client.
Because the root fragment executor was not run it will never call it's
closeOutResources() method and it's fragment context will never be closed.
You can easily reproduce this by running the following unit test:
{noformat}
org.apache.drill.exec.server.TestDrillbitResilience#failsWhenSendingFragments
{noformat}
although the test passes successfully because Drill does report the correct
failure to the client, the memory leak is not detected and will show up after
the test finishes
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