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https://issues.apache.org/jira/browse/SPARK-18991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shixiong Zhu resolved SPARK-18991.
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Resolution: Fixed
Fix Version/s: 2.2.0
2.1.1
> Change ContextCleaner.referenceBuffer to ConcurrentHashMap to make it faster
> ----------------------------------------------------------------------------
>
> Key: SPARK-18991
> URL: https://issues.apache.org/jira/browse/SPARK-18991
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Fix For: 2.1.1, 2.2.0
>
>
> Right now `ContextCleaner.referenceBuffer` is ConcurrentLinkedQueue and the
> time complexity of the `remove` action is O(n). It can be changed to use
> ConcurrentHashMap whose `remove` is O(1).
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