GitHub user sitalkedia opened a pull request:
https://github.com/apache/spark/pull/15408
[SPARK-17839][CORE] UnsafeSorterSpillReader should use Nio's directbuffer
to read the spill files in order to avoid additional copy
## What changes were proposed in this pull request?
Currently we use BufferedInputStream to read the shuffle file which copies
the file content from os buffer cache to the user buffer. This adds additional
latency in reading the spill files. We made a change to use java nio's direct
buffer to read the spill files and for certain jobs spilling significant amount
of data, we see up to 7% speedup.
## How was this patch tested?
Tested by running the job in the cluster and observed up to 7% speedup.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sitalkedia/spark skedia/nio_spill_read
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15408.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 #15408
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commit bd741fa0bfebf7d837ee46aed1f63c8dcbfc717b
Author: Sital Kedia <[email protected]>
Date: 2016-10-09T18:02:33Z
[SPARK-17839][CORE] UnsafeSorterSpillReader should use Nio's directbuffer
to read the spill files in order to avoid additional copy
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