GitHub user yhuai opened a pull request:
https://github.com/apache/spark/pull/9276
[SPARK-9858][SPARK-9859][SPARK-9861][SQL][WIP] Add an ExchangeCoordinator
to estimate the number of post-shuffle partitions for aggregates and joins
https://issues.apache.org/jira/browse/SPARK-9858
https://issues.apache.org/jira/browse/SPARK-9859
https://issues.apache.org/jira/browse/SPARK-9861
Will fill in more details. Send out the PR first to let jenkins test it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yhuai/spark numReducer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9276.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 #9276
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commit 18740c3c7241e58dfe655d90ef12bc088ab5b4f1
Author: Yin Huai <[email protected]>
Date: 2015-10-21T05:45:18Z
Make ShuffledRowRDD support fetching multiple parent partitions.
commit 6fd0594a913d9a969caa49aaf798ca9d718be44e
Author: Yin Huai <[email protected]>
Date: 2015-10-23T05:15:48Z
Add an ExchangeCoordinator to estimate the number of post-shuffle
partitions.
commit d392656ad8cde9230320203ab360030ded4616ed
Author: Yin Huai <[email protected]>
Date: 2015-10-26T05:55:03Z
Change settings for testing purpose.
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