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https://issues.apache.org/jira/browse/SPARK-12688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-12688.
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Resolution: Incomplete
> Spill size metric does not update for tungsten aggregation
> ----------------------------------------------------------
>
> Key: SPARK-12688
> URL: https://issues.apache.org/jira/browse/SPARK-12688
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Carson Wang
> Priority: Minor
> Labels: bulk-closed
>
> When doing a sql aggregation in tungsten mode, the spill size metric may not
> update though there are data spilled. Because the data are stored in the
> `BytesToBytesMap` instead of `UnsafeExternalSorter`, the memory are freed
> when the map resets instead of when the sorter spills.
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