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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3529) Use direct buffers for data in write path
Date Tue, 06 Nov 2012 18:14:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491671#comment-13491671
] 

Hadoop QA commented on HDFS-3529:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12552318/dfsio-x86-trunk-vs-3529.png
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3455//console

This message is automatically generated.
                
> Use direct buffers for data in write path
> -----------------------------------------
>
>                 Key: HDFS-3529
>                 URL: https://issues.apache.org/jira/browse/HDFS-3529
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, performance
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Trevor Robinson
>         Attachments: dfsio-x86-trunk-vs-3529.png, HDFS-3529.patch
>
>
> The write path currently makes several unnecessary data copies in order to go to and
from byte arrays. We can improve performance by using direct byte buffers to avoid the copy.
This is also a prerequisite for native checksum calculation (HDFS-3528)

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