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https://issues.apache.org/jira/browse/SPARK-7795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-7795.
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Resolution: Fixed
Fix Version/s: 1.5.0
Issue resolved by pull request 6323
[https://github.com/apache/spark/pull/6323]
> Speed up task serialization in standalone mode
> ----------------------------------------------
>
> Key: SPARK-7795
> URL: https://issues.apache.org/jira/browse/SPARK-7795
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.3.1
> Reporter: Akshat Aranya
> Fix For: 1.5.0
>
>
> My experiments with scheduling very short tasks in standalone cluster mode
> indicated that a significant amount of time was being spent in scheduling the
> tasks (>500ms for 256 tasks). I found that most of the time was being spent
> in creating a new instance of serializer for each task. Changing this to just
> one serializer brought down the scheduling time to 8ms.
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