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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3529) Use direct buffers for data in write path
Date Mon, 01 Sep 2014 03:22:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14116999#comment-14116999
] 

Yi Liu commented on HDFS-3529:
------------------------------

Thanks [~tlipcon].

> 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: datanode, performance
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Trevor Robinson
>         Attachments: HDFS-3529.patch, dfsio-x86-trunk-vs-3529.png
>
>
> 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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