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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7291) Persist in-memory replicas with appropriate unbuffered copy API on POSIX and Windows
Date Tue, 28 Oct 2014 16:15:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187013#comment-14187013
] 

Hadoop QA commented on HDFS-7291:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12677537/HDFS-7291.4.patch
  against trunk revision 58c0bb9.

    {color:red}-1 patch{color}.  Trunk compilation may be broken.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8570//console

This message is automatically generated.

> Persist in-memory replicas with appropriate unbuffered copy API on POSIX and Windows
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-7291
>                 URL: https://issues.apache.org/jira/browse/HDFS-7291
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>         Attachments: HDFS-7291.0.patch, HDFS-7291.1.patch, HDFS-7291.2.patch, HDFS-7291.3.patch,
HDFS-7291.4.patch
>
>
> HDFS-7090 changes to persist in-memory replicas using unbuffered IO on Linux and Windows.
On Linux distribution, it relies on the sendfile() API between two file descriptors to achieve
unbuffered IO copy. According to Linux document at http://man7.org/linux/man-pages/man2/sendfile.2.html,
this is only supported on Linux kernel 2.6.33+. 
> As pointed by Haowei in the discussion below, FileChannel#transferTo already has support
for native unbuffered IO on POSIX platform. On Windows, JDK 6/7/8 has not implemented native
unbuffered IO yet. We change to use FileChannel#transfer for POSIX and our own native wrapper
of CopyFileEx on Windows for unbuffered copy.  



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