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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4213) When the client calls hsync(), allows the client to update the file length in the NameNode
Date Wed, 21 Nov 2012 20:05:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502262#comment-13502262
] 

Hadoop QA commented on HDFS-4213:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12554544/HDFS-4213.002.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.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3553//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3553//console

This message is automatically generated.
                
> When the client calls hsync(), allows the client to update the file length in the NameNode
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4213
>                 URL: https://issues.apache.org/jira/browse/HDFS-4213
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-4213.001.patch, HDFS-4213.002.patch
>
>
> As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong consistency
update the file length at the NameNode, a special sync is required for getting the length
of the being written files when snapshots are taken for these files. This jira implements
this sync-with-updating-length by 1) calling ClientProtocol#fsync(), and 2) adding a new field
to ClientProtocol#fsync() to indicate the length information.

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