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https://issues.apache.org/jira/browse/DRILL-5210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers resolved DRILL-5210.
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Resolution: Fixed
Fix Version/s: 1.10.0
> External Sort BatchGroup leaks memory if an OOM occurs during read
> ------------------------------------------------------------------
>
> Key: DRILL-5210
> URL: https://issues.apache.org/jira/browse/DRILL-5210
> Project: Apache Drill
> Issue Type: Sub-task
> Affects Versions: 1.9.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Fix For: 1.10.0
>
>
> The External Sort operator (batch) can spill to disk when it runs out of
> memory. To do so, it uses a class called {{BatchGroup}}. Later, when the sort
> merges spilled runs, {{BatchGroup}} reads the run back into memory one batch
> at a time.
> If an OOM error occurs during the read operation, the partially-read batches
> leak: they are not released. The fragment executor then issues a memory leak
> error while shutting down the query.
> This error has probably not been caught until now because the {{BatchGroup}}
> code does not make use of the fault injector. Elsewhere in the external sort,
> we use the fault injector to insert a (simulated) OOM exception so we can
> determine if clean-up occurs properly. No such fault injection code exists in
> {{BatchGroup}}.
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