GitHub user javadba opened a pull request:
https://github.com/apache/spark/pull/1542
SPARK-2638 MapOutputTracker concurrency improvement
Spark-2638 Improve concurrency of fetching Map outputs
This issue was noticed while perusing the MapOutputTracker source code.
Notice that the synchronization is on the containing "fetching" collection -
which makes ALL fetches wait if any fetch were occurring.
The fix is to synchronize instead on the shuffleId (interned as a string to
ensure JVM wide visibility).
For further details please refer to the JIRA.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/javadba/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1542.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 #1542
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commit 5d1cb0a449bbf1ea95272a45f2d030d5cad0195c
Author: Stephen Boesch <[email protected]>
Date: 2014-07-23T04:33:25Z
SPARK-2638 MapOutputTracker concurrency improvement
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