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https://issues.apache.org/jira/browse/HDFS-6755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14075050#comment-14075050
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Hudson commented on HDFS-6755:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #5971 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/5971/])
HDFS-6755. There is an unnecessary sleep in the code path where 
DFSOutputStream#close gives up its attempt to contact the namenode (mitdesai21 
via cmccabe) (cmccabe: 
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1613522)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* 
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java


> There is an unnecessary sleep in the code path where DFSOutputStream#close 
> gives up its attempt to contact the namenode
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6755
>                 URL: https://issues.apache.org/jira/browse/HDFS-6755
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Mit Desai
>            Assignee: Mit Desai
>         Attachments: HDFS-6755.patch
>
>
> DFSOutputStream#close has a loop where it tries to contact the NameNode, to 
> call {{complete}} on the file which is open-for-write.  This loop includes a 
> sleep which increases exponentially (exponential backoff).  It makes sense to 
> sleep before re-contacting the NameNode, but the code also sleeps even in the 
> case where it has already decided to give up and throw an exception back to 
> the user.  It should not sleep after it has already decided to give up, since 
> there's no point.



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