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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
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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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