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https://issues.apache.org/jira/browse/HADOOP-5034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668723#action_12668723
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Hadoop QA commented on HADOOP-5034:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12398963/blockTransferInvalidate3.patch
against trunk revision 738944.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 6 new or modified tests.
+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 core tests. The patch passed core unit tests.
-1 contrib tests. The patch failed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3776/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3776/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3776/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3776/console
This message is automatically generated.
> NameNode should send both replication and deletion requests to DataNode in
> one reply to a heartbeat
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-5034
> URL: https://issues.apache.org/jira/browse/HADOOP-5034
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Affects Versions: 0.18.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.19.1
>
> Attachments: blockTransferInvalidate.patch,
> blockTransferInvalidate1.patch, blockTransferInvalidate2.patch,
> blockTransferInvalidate3.patch
>
>
> Currently NameNode favors block replication requests over deletion requests.
> On reply to a heartbeat, NameNode does not send a block deletion request
> unless there is no block replication request.
> This brings a problem when a near-full cluster loses a bunch of DataNodes. In
> react to the DataNode loss, NameNode starts to replicate blocks. However,
> replication takes a lot of cpu and a lot of replications fail because of the
> lack of disk space. So the administrator tries to delete some DFS files to
> free up space. However, block deletion requests get delayed for very long
> time because it takes a long time to drain the block replication requests for
> most DataNodes.
> I'd like to propose to let NameNode to send both replication requests and
> deletion requests to DataNodes in one reply to a heartbeat. This also implies
> that the replication monitor should schedule both replication and deletion
> work in one iteration.
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