GitHub user techaddict opened a pull request:
https://github.com/apache/spark/pull/707
SPARK-1775: Unneeded lock in ShuffleMapTask.deserializeInfo
This was used in the past to have a cache of deserialized ShuffleMapTasks,
but that's been removed, so there's no need for a lock. It slows down Spark
when task descriptions are large, e.g. due to large lineage graphs or local
variables.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/techaddict/spark SPARK-1775
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/707.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 #707
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commit 18d8ebf3d04cd71d13ca95b432024f4d1f8c0718
Author: Sandeep <[email protected]>
Date: 2014-05-09T03:14:05Z
SPARK-1775: Unneeded lock in ShuffleMapTask.deserializeInfo
This was used in the past to have a cache of deserialized ShuffleMapTasks,
but that's been removed, so there's no need for a lock. It slows down Spark
when task descriptions are large, e.g. due to large lineage graphs or local
variables.
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