GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/12899
[SPARK-12837][CORE] Only send back updated accumulators to driver
## What changes were proposed in this pull request?
Sending un-updated accumulators back to driver makes no sense, as merging a
zero value accumulator is a no-op. We should only send back updated
accumulators, to save network IO.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark acc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12899.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 #12899
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commit 57fc9afbda5265d389771c0e102266e39171034b
Author: Wenchen Fan <[email protected]>
Date: 2016-05-04T14:56:24Z
Only send back updated accumulators to driver
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