GitHub user 10110346 opened a pull request:
https://github.com/apache/spark/pull/22163
[SPARK-25166][CORE]Reduce the number of write operations for shuffle write.
## What changes were proposed in this pull request?
Currently, only one record is written to a buffer each time, which
increases the number of copies.
I think we should write as many records as possible each time.
## How was this patch tested?
Existed unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/10110346/spark reducewrite
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22163.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 #22163
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commit 671268b679f9221fd96e9ab2ea929df4a9908de8
Author: liuxian <liu.xian3@...>
Date: 2018-08-21T02:42:30Z
fix
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