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https://issues.apache.org/jira/browse/SPARK-5369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-5369.
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Resolution: Duplicate
> remove allocatedHostToContainersMap.synchronized in YarnAllocator
> -----------------------------------------------------------------
>
> Key: SPARK-5369
> URL: https://issues.apache.org/jira/browse/SPARK-5369
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Reporter: Lianhui Wang
>
> as SPARK-1714 mentioned, because YarnAllocator.allocateResources is a
> synchronized method, we can remove allocatedHostToContainersMap.synchronized
> in YarnAllocator.allocateResources.
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