GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/15128
[SPARK-17574][Core] Cache ShuffleExchange RDD when the exchange is reused
## What changes were proposed in this pull request?
We have the rule `ReuseExchange` to reuse exchange in the physical plan.
However, for a `ShuffleExchange` we still need to retrieve remote blocks again
when the shuffle exchange is reused. We can cache the RDD of the reused
`ShuffleExchange` to avoid transferring remote blocks again.
## How was this patch tested?
Manual tests. This patch can avoid transferring remote blocks again when a
shuffle exchange is reused.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 cache-reused-shuffle
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15128.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 #15128
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commit cbbaf318ecb9e21df464f487dd4dbb37ceee3923
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date: 2016-09-17T09:34:20Z
Cache ShuffleExchange RDD when the exchange is reused.
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