Josh Rosen created SPARK-7542:
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Summary: Use LongArray for sort buffer in UnsafeExternalSorter
Key: SPARK-7542
URL: https://issues.apache.org/jira/browse/SPARK-7542
Project: Spark
Issue Type: Improvement
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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