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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7112) LazyWriter should use either async IO or one thread per physical disk
Date Wed, 08 Oct 2014 01:52:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162932#comment-14162932
] 

Hadoop QA commented on HDFS-7112:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12673484/HDFS-7112.3.patch
  against trunk revision 9b8a35a.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The test build failed in hadoop-hdfs-project/hadoop-hdfs


    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8347//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8347//console

This message is automatically generated.

> LazyWriter should use either async IO or one thread per physical disk
> ---------------------------------------------------------------------
>
>                 Key: HDFS-7112
>                 URL: https://issues.apache.org/jira/browse/HDFS-7112
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Xiaoyu Yao
>             Fix For: 2.6.0
>
>         Attachments: HDFS-7112.0.patch, HDFS-7112.1.patch, HDFS-7112.2.patch, HDFS-7112.3.patch
>
>
> The LazyWriter currently uses synchronous IO and a single thread. This limits the throughput
to that of a single disk. Using either async overlapped IO or one thread per physical disk
will improve the write throughput.



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