GitHub user 10110346 opened a pull request:
https://github.com/apache/spark/pull/20576
[CORE]The shuffle dependency specifies aggregation ,and
`dependency.mapSideCombine=false`,it seems that serialized sorting can be used
## What changes were proposed in this pull request?
The shuffle dependency specifies aggregation ,and
`dependency.mapSideCombine=false`,it seems that serialized sorting can be used.
## How was this patch tested?
Existing unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/10110346/spark mapsidecombine
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20576.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 #20576
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commit ef6d3f1361395905e43b01e1bbf7f0d2f7167cac
Author: liuxian <liu.xian3@...>
Date: 2018-02-11T08:44:16Z
fix
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