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https://issues.apache.org/jira/browse/HDFS-5563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832284#comment-13832284
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Hadoop QA commented on HDFS-5563:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12615764/HDFS-5563.001.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 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}. The javadoc tool did not generate any
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 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs-nfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/5571//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5571//console
This message is automatically generated.
> NFS gateway should commit the buffered data when read request comes after
> write to the same file
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-5563
> URL: https://issues.apache.org/jira/browse/HDFS-5563
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: nfs
> Reporter: Brandon Li
> Assignee: Brandon Li
> Attachments: HDFS-5563.001.patch
>
>
> HDFS write is asynchronous and data may not be available to read immediately
> after write.
> One of the main reason is that DFSClient doesn't flush data to DN until its
> local buffer is full.
> To workaround this problem, when a read comes after write to the same file,
> NFS gateway should sync the data so the read request can get the latest
> content. The drawback is that, the frequent hsync() call can slow down data
> write.
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