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
----
commit 18d8ebf3d04cd71d13ca95b432024f4d1f8c0718
Author: Sandeep <sand...@techaddict.me>
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.
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
