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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4161) HDFS keeps a thread open for every file writer
Date Thu, 08 Nov 2012 20:48:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493475#comment-13493475
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4161:
----------------------------------------------

test-patch results:
{noformat}
     [exec] -1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 21 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     -1 findbugs.  The patch appears to introduce 9 new Findbugs (version 1.3.9)
warnings.
{noformat}
                
> HDFS keeps a thread open for every file writer
> ----------------------------------------------
>
>                 Key: HDFS-4161
>                 URL: https://issues.apache.org/jira/browse/HDFS-4161
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 1.0.0
>            Reporter: Suresh Srinivas
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h4161_20121108_b-1.patch
>
>
> In 1.0 release DFSClient uses a thread per file writer. In some use cases (dynamic partions
in hive) that use a large number of file writers a large number of threads are created. The
file writer thread has the following stack:
> {noformat}
> at java.lang.Thread.sleep(Native Method)
> at org.apache.hadoop.hdfs.DFSClient$LeaseChecker.run(DFSClient.java:1462)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
> This problem has been fixed in later releases. This jira will post a consolidated patch
from various jiras that addresses the issue.

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