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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9689) Implement HDFS Zero-copy reading
Date Wed, 03 Jul 2013 01:15:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698472#comment-13698472

Colin Patrick McCabe commented on HADOOP-9689:

Hi Jacques,

I've been working on a patch that enables mmap support in HDFS.  I'm going to post it this

Since you mentioned HADOOP-8148, I assume that the zero-copy work you're doing here relates
to eliminating the buffer copies in the decompression codecs by replacing byte[] copies with
the use of ByteBuffer and so forth.  If you are also working on mmap, let's coordinate on

You might also want to remove the 'HDFS' from the title if this JIRA is in Hadoop common...
or move it to HDFS. :)

> Implement HDFS Zero-copy reading
> --------------------------------
>                 Key: HADOOP-9689
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9689
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Jacques Nadeau
> Leverage the work in https://issues.apache.org/jira/browse/HADOOP-8148 to support zero
copy reading of columnar file formats for improved performance.

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