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Date: Tue, 24 Mar 2015 03:07:53 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12784980.1427142502000.5315.1427166473048@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-7976) Update NFS user guide for mount
 option "sync" to minimize or avoid reordered writes
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    [ https://issues.apache.org/jira/browse/HDFS-7976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377189#comment-14377189 ] 

Hadoop QA commented on HDFS-7976:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12706757/HDFS-7976.002.patch
  against trunk revision 972f1f1.

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

    {color:green}+0 tests included{color}.  The patch appears to be a documentation patch that doesn't require tests.

    {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 patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.tracing.TestTracing

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/10041//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/10041//console

This message is automatically generated.

> Update NFS user guide for mount option "sync" to minimize or avoid reordered writes
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-7976
>                 URL: https://issues.apache.org/jira/browse/HDFS-7976
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation, nfs
>    Affects Versions: 2.2.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-7976.001.patch, HDFS-7976.002.patch
>
>
> The mount option "sync" is critical. I observed that this mount option can minimize or avoid reordered writes. Mount option "sync" could have some negative performance impact on the file uploading. However, it makes the performance much more predicable and can also reduce the possibility of failures caused by file dumping.


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