[jira] [Updated] (SPARK-7542) Use off-heap sort buffer in UnsafeExternalSorter

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-7542:
-------------------------------
    Summary: Use off-heap sort buffer in UnsafeExternalSorter  (was: Use LongArray for sort buffer in UnsafeExternalSorter)

> Use off-heap sort buffer in UnsafeExternalSorter
> ------------------------------------------------
>
>                 Key: SPARK-7542
>                 URL: https://issues.apache.org/jira/browse/SPARK-7542
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core
>    Affects Versions: 1.4.0
>            Reporter: Josh Rosen
>
> {{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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