GitHub user sitalkedia opened a pull request:
https://github.com/apache/spark/pull/12944
[SPARK-15074][Shuffle] Cache shuffle index file to speedup shuffle fetch
## What changes were proposed in this pull request?
Shuffle fetch on large intermediate dataset is slow because the shuffle
service open/close the index file for each shuffle fetch. This change
introduces a cache for the index information so that we can avoid accessing the
index files for each block fetch
## How was this patch tested?
Tested by running a job on the cluster and the shuffle read time was
reduced by 50%.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sitalkedia/spark shuffle_service
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12944.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 #12944
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commit 9ca03093bb7d3eef8bdb25fe41172dfce259d496
Author: Sital Kedia <[email protected]>
Date: 2016-05-04T01:34:05Z
[SPARK-15074][Shuffle] Cache shuffle index file to speedup shuffle fetch
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