GitHub user shivaram opened a pull request:
https://github.com/apache/spark/pull/4576
[SPARK-2774] Set preferred locations for reduce tasks
This is another attempt at #1697 addressing some of the earlier concerns.
This adds a couple of thresholds based on number map and reduce tasks
beyond which we don't use preferred locations for reduce tasks.
This patch also fixes some bugs in DAGSchedulerSuite where the MapStatus
objects created didn't have the right number of reducers set.
cc @JoshRosen @rxin @pwendell
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shivaram/spark-1 reduce-locations
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4576.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 #4576
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commit 3b464b7c488372a305202d17d5efad315eb0e024
Author: Shivaram Venkataraman <[email protected]>
Date: 2015-02-12T21:40:02Z
Set preferred locations for reduce tasks
This is another attempt at #1697 addressing some of the earlier concerns.
This adds a couple of thresholds based on number map and reduce tasks
beyond which we don't use preferred locations for reduce tasks.
This patch also fixes some bugs in DAGSchedulerSuite where the MapStatus
objects created didn't have the right number of reducers set.
commit 34d0283fb173c6bf2f4b49d57d2cc10860ed8797
Author: Shivaram Venkataraman <[email protected]>
Date: 2015-02-12T21:47:13Z
Fix style issues
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