GitHub user YuhuWang2002 opened a pull request:
https://github.com/apache/spark/pull/15297
[WIP][SPARK-9862]Handling data skew
## What changes were proposed in this pull request?
As https://issues.apache.org/jira/browse/SPARK-9862 said, handling data
skew when join.
## How was this patch tested?
Unit tests in ExchangeCoordinatorSuite
also can generate skew data and manual test
Author: wangyuhu<[email protected]>
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/YuhuWang2002/spark-1 skewjoin
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15297.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 #15297
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commit ef1baae1768dc8fd676f617bf7c1e85d72179ba8
Author: wangyuhu <[email protected]>
Date: 2016-09-28T02:46:49Z
[SPARK-9862] handling data skew , add skew join feature
commit c561ea718fd65adc0f1187097b9da88fc0054192
Author: wangyuhu <[email protected]>
Date: 2016-09-28T08:41:46Z
code style fix
commit 9025e24b6552b39bd3ab20632b702b60edc2ad10
Author: wangyuhu <[email protected]>
Date: 2016-09-29T10:56:10Z
add comment
commit 0ba86a2284e684a733f989ed6e595575f511c8bd
Author: wangyuhu <[email protected]>
Date: 2016-09-29T11:38:26Z
modify UT code
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