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https://issues.apache.org/jira/browse/SPARK-5848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-5848.
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Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 4635
[https://github.com/apache/spark/pull/4635]
> ConsoleProgressBar timer thread leaks SparkContext
> --------------------------------------------------
>
> Key: SPARK-5848
> URL: https://issues.apache.org/jira/browse/SPARK-5848
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell
> Affects Versions: 1.2.1
> Reporter: Matt Whelan
> Fix For: 1.3.0
>
>
> ConsoleProgressBar starts a timer. This creates a thread (which is a garbage
> collection root) with a reference to the ConsoleProgressBar instance, which
> holds a reference to the SparkContext.
> That timer is never canceled, so SparkContexts are leaked.
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