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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1348) Improve NameNode reponsiveness while it is checking if datanode decommissions are complete
Date Wed, 22 Dec 2010 02:32:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974020#action_12974020
] 

Hadoop QA commented on HDFS-1348:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12455885/decomissionImp2.patch
  against trunk revision 1051669.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed these core unit tests:
                  org.apache.hadoop.hdfs.server.namenode.TestStorageRestore
                  org.apache.hadoop.hdfs.TestFileConcurrentReader
                  org.apache.hadoop.hdfs.TestHDFSTrash

    -1 contrib tests.  The patch failed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/22//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/22//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/22//console

This message is automatically generated.

> Improve NameNode reponsiveness while it is checking if datanode decommissions are complete
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1348
>                 URL: https://issues.apache.org/jira/browse/HDFS-1348
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>         Attachments: decomissionImp1.patch, decomissionImp2.patch, decommission.patch,
decommission1.patch
>
>
> NameNode normally is busy all the time. Its log is full of activities every second. But
once for a while, NameNode seems to pause for more than 10 seconds without doing anything,
leaving a blank in its log even though no garbage collection is happening.  All other requests
to NameNode are blocked when this is happening.
> One culprit is DecommionManager. Its monitor holds the fsynamesystem lock during the
whole process of checking if decomissioning DataNodes are finished or not, during which it
checks every block of up to a default of 5 datanodes.

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