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https://issues.apache.org/jira/browse/SPARK-13186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151973#comment-15151973
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Apache Spark commented on SPARK-13186:
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User 'huaxingao' has created a pull request for this issue:
https://github.com/apache/spark/pull/11250
> Migrate away from SynchronizedMap which is deprecated
> -----------------------------------------------------
>
> Key: SPARK-13186
> URL: https://issues.apache.org/jira/browse/SPARK-13186
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core, SQL, Streaming
> Reporter: holdenk
> Priority: Trivial
>
> The warning is " trait SynchronizedMap in package mutable is deprecated:
> Synchronization via traits is deprecated as it is inherently unreliable.
> Consider java.util.concurrent.ConcurrentHashMap as an alternative.
> [warn] val failureReasons = new HashMap[Int, String] with
> SynchronizedMap[Int, String]"
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