GitHub user sitalkedia opened a pull request:
https://github.com/apache/spark/pull/17343
[SPARK-20014] Optimize mergeSpillsWithFileStream method
## What changes were proposed in this pull request?
When the individual partition size in a spill is small,
mergeSpillsWithTransferTo method does many small disk ios which is really
inefficient. One way to improve the performance will be to use
mergeSpillsWithFileStream method by turning off transfer to and using buffered
file read/write to improve the io throughput.
However, the current implementation of mergeSpillsWithFileStream does not
do a buffer read/write of the files and in addition to that it unnecessarily
flushes the output files for each partitions.
## How was this patch tested?
Unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sitalkedia/spark
upstream_mergeSpillsWithFileStream
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17343.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17343
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commit e9ac76edb055d08699d9de7a5ff77b7ca8a7f5c6
Author: Sital Kedia <ske...@fb.com>
Date: 2017-03-19T00:24:10Z
[SPARK-20014] Optimize mergeSpillsWithFileStream method
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