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https://issues.apache.org/jira/browse/SPARK-4307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Davidson resolved SPARK-4307.
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Resolution: Fixed
Fix Version/s: 1.2.0
> Initialize FileDescriptor lazily in FileRegion
> ----------------------------------------------
>
> Key: SPARK-4307
> URL: https://issues.apache.org/jira/browse/SPARK-4307
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 1.2.0
>
>
> We use Netty's DefaultFileRegion to do zero copy send. However,
> DefaultFileRegion requires a FileDescriptor, which results in a large number
> of opened files in larger workloads.
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