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Posted to common-issues@hadoop.apache.org by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org> on 2011/10/18 04:42:10 UTC

[jira] [Commented] (HADOOP-7754) Expose file descriptors from Hadoop-wrapped local FileSystems

    [ https://issues.apache.org/jira/browse/HADOOP-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13129432#comment-13129432 ] 

Todd Lipcon commented on HADOOP-7754:
-------------------------------------

In the proof-of-concept patch in HADOOP-7714, I added calls to {{FSDataInputStream}} to allow implementors to expose a file descriptor. It's a little bit ugly. If anyone has better ideas how to achieve the same goal, would be very much appreciated.
                
> 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
>
> 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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