GitHub user 10110346 opened a pull request:
https://github.com/apache/spark/pull/23228
[MINOR][DOC]The condition description of serialized shuffle is not very
accurate
## What changes were proposed in this pull request?
`1. The shuffle dependency specifies no aggregation or output ordering.`
If the shuffle dependency specifies aggregation, but it only aggregates at
the reducer side, serialized shuffle can still be used.
`3. The shuffle produces fewer than 16777216 output partitions.`
If the number of output partitions is 16777216 , we can use serialized
shuffle.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/10110346/spark SerializedShuffle_doc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23228.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 #23228
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commit d5dadbf30d5429c36ec3d5c2845a71c2717fd6f3
Author: liuxian <liu.xian3@...>
Date: 2018-12-05T08:55:20Z
fix
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