GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/12612
[SPARK-14654][CORE][WIP] New accumulator API
## What changes were proposed in this pull request?
This PR introduces a new accumulator API which is much simpler than before:
1. the type hierarchy is simplified, now we only have an `Accumulator` class
2. there is no `localValue`, just `value`
3. there is no `zero` and `initialValue`, but an `initialize` method.
4. there in only one `register` method, the accumulator registration and
cleanup registration are combined.
## How was this patch tested?
existing tests
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/12612.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 #12612
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commit 50ebb24b8be67eb0dab40b5313a9ad1d01f8129e
Author: Wenchen Fan <[email protected]>
Date: 2016-04-22T14:48:08Z
new accumulator
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