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https://issues.apache.org/jira/browse/SPARK-1775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-1775.
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Resolution: Fixed
Fix Version/s: 1.0.0
Issue resolved by pull request 707
[https://github.com/apache/spark/pull/707]
> Unneeded lock in ShuffleMapTask.deserializeInfo
> -----------------------------------------------
>
> Key: SPARK-1775
> URL: https://issues.apache.org/jira/browse/SPARK-1775
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 0.9.0, 1.0.0, 0.9.1
> Reporter: Matei Zaharia
> Assignee: Sandeep Singh
> Labels: Starter
> Fix For: 1.0.0
>
>
> 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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