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https://issues.apache.org/jira/browse/HADOOP-5479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682543#action_12682543
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Hadoop QA commented on HADOOP-5479:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12402322/numTransfers1.patch
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 warnings.
+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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