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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5479) NameNode should not send empty block replication request to DataNode
Date Tue, 17 Mar 2009 02:35:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682543#action_12682543

Hadoop QA commented on HADOOP-5479:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 755003.

    +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 tests are needed for 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 does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

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

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/92/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/92/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/92/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/92/console

This message is automatically generated.

> NameNode should not send empty block replication request to DataNode
> --------------------------------------------------------------------
>                 Key: HADOOP-5479
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5479
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>            Priority: Critical
>             Fix For: 0.19.2, 0.20.0, 0.21.0
>         Attachments: numTransfers.patch, numTransfers1.patch
> On our production clusters, we occasionally see that NameNode sends an empty block replication
request to DataNode on  every heartbeat, thus blocking this DataNode from replicating or deleting
any block.
> This is partly caused by DataNode sending a wrong number of replications in progress
which will be fixed by HADOOP-5465. There is also a flaw at the NameNode side. NameNode should
not interpret the number of replications in progress as the number of targets since replication
is done through a pipeline. It also should make sure that no empty replication request is
sent to DataNode.

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