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https://issues.apache.org/jira/browse/DRILL-4121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kunal Khatua closed DRILL-4121.
-------------------------------
Setting direct memory to 10GB and altered the session by setting
`planner.memory.max_query_memory_per_node`=21474836 (20MB).
Forcing an external sort, the Drillbits began to spill data to disk with no
significant increase in the Drillbit memory footprint.
Verified on Drill 1.6.0.
> External Sort may not spill if above a receiver
> -----------------------------------------------
>
> Key: DRILL-4121
> URL: https://issues.apache.org/jira/browse/DRILL-4121
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Deneche A. Hakim
> Assignee: Kunal Khatua
> Fix For: 1.5.0
>
>
> If external sort is above a receiver, all received batches will contain non
> root buffers. Sort operator doesn't account for non root buffers when
> estimating how much memory and if it needs to spill to disk. This may delay
> the spill and cause the corresponding Drillbit to use large amounts of memory
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