GitHub user mxm opened a pull request:
https://github.com/apache/flink/pull/1976
[FLINK-3880] remove mutex for user accumulators hash map
This has been reported as a performance impact. The synchronized lock is
not necessary because Flink doesn't perform concurrent updates on the per-task
map. If users want to access concurrently, they could implement their own lock.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mxm/flink FLINK-3880
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1976.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 #1976
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commit 1821ecbc3fb4866bc44eb2bcb8d4e7464f740416
Author: Maximilian Michels <[email protected]>
Date: 2016-05-06T08:40:51Z
[FLINK-3880] remove mutex for user accumulators hash map
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