GitHub user shivaram opened a pull request:
https://github.com/apache/spark/pull/1697
[SPARK-2774 - Set preferred locations for reduce tasks
Motivation for the change is in JIRA. There are a couple of things that I
would like feedback about
1. Should we sort the map outputs by size for every task -- This could be
expensive if we have a large number of map outputs.
2. The number of preferred locations to use. Technically we could set this
to a larger number, but I am not sure how it will affect the locality / delay
scheduling in TaskSetManager.
cc @rxin
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shivaram/spark-1 reducer-locality
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1697.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 #1697
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commit 3fe76f7a22c663ae1f28585b6e2c15696f46e0d9
Author: Shivaram Venkataraman <shiva...@cs.berkeley.edu>
Date: 2014-07-31T04:15:53Z
Set preferred locations for reduce tasks
commit f8390ddb0e9f50ec734735ea4ec80f5af419d359
Author: Shivaram Venkataraman <shiva...@cs.berkeley.edu>
Date: 2014-07-31T04:55:12Z
Amortize traversing array by doing it once per RDD.
commit 6782dea8aa36628b5319191e6f52a8f62fa6f98c
Author: Shivaram Venkataraman <shiva...@cs.berkeley.edu>
Date: 2014-07-31T18:04:00Z
Merge branch 'master' of https://github.com/apache/spark into
reducer-locality
commit 3666ff57fd1d25761edaadbf34d8287ff6df25f8
Author: Shivaram Venkataraman <shiva...@cs.berkeley.edu>
Date: 2014-07-31T18:29:57Z
Add a unit test that checks for reducer locality
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