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https://issues.apache.org/jira/browse/SPARK-13204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-13204.
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Resolution: Duplicate
> Replace use of mutable.SynchronizedMap with ConcurrentHashMap
> -------------------------------------------------------------
>
> Key: SPARK-13204
> URL: https://issues.apache.org/jira/browse/SPARK-13204
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Ted Yu
> Priority: Trivial
>
> From
> http://www.scala-lang.org/api/2.11.1/index.html#scala.collection.mutable.SynchronizedMap
> :
> Synchronization via traits is deprecated as it is inherently unreliable.
> Consider java.util.concurrent.ConcurrentHashMap as an alternative.
> This issue is to replace the use of mutable.SynchronizedMap and add
> scalastyle rule banning mutable.SynchronizedMap
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