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https://issues.apache.org/jira/browse/SPARK-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davies Liu reassigned SPARK-7542:
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Assignee: Davies Liu
> Support off-heap sort buffer in UnsafeExternalSorter
> ----------------------------------------------------
>
> Key: SPARK-7542
> URL: https://issues.apache.org/jira/browse/SPARK-7542
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: Josh Rosen
> Assignee: Davies Liu
>
> {{UnsafeExternalSorter}}, introduced in SPARK-7081, uses on-heap {{long[]}}
> arrays as its sort buffers. When records are small, the sorting array might
> be as large as the data pages, so it would be useful to be able to allocate
> this array off-heap (using our unsafe LongArray). Unfortunately, we can't
> currently do this because TimSort calls {{allocate()}} to create data buffers
> but doesn't call any corresponding cleanup methods to free them.
> We should look into extending TimSort with buffer freeing methods, then
> consider switching to LongArray in UnsafeShuffleSortDataFormat.
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