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https://issues.apache.org/jira/browse/HADOOP-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429032#comment-13429032
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Ahmed Radwan commented on HADOOP-7754:
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Here is an updated patch that applies cleanly to trunk.
> Expose file descriptors from Hadoop-wrapped local FileSystems
> -------------------------------------------------------------
>
> Key: HADOOP-7754
> URL: https://issues.apache.org/jira/browse/HADOOP-7754
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: native
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: HADOOP-7754_trunk.patch, hadoop-7754-0.23.0-hasfd.txt,
> hasfd.txt
>
>
> In HADOOP-7714, we determined that using fadvise inside of the MapReduce
> shuffle can yield very good performance improvements. But many parts of the
> shuffle are FileSystem-agnostic and thus operate on FSDataInputStreams and
> RawLocalFileSystems. This JIRA is to figure out how to allow
> RawLocalFileSystem to expose its FileDescriptor object without unnecessarily
> polluting the public APIs.
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