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https://issues.apache.org/jira/browse/HDFS-15?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976172#action_12976172
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Eli Collins commented on HDFS-15:
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Patch passes all unit tests on branch 20. test-patch results:
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[exec]
[exec] -1 overall.
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[exec] +1 @author. The patch does not contain any @author tags.
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[exec] +1 tests included. The patch appears to include 15 new or
modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
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[exec] -1 Eclipse classpath. The patch causes the Eclipse classpath to
differ from the contents of the lib directories.
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> Rack replication policy can be violated for over replicated blocks
> -------------------------------------------------------------------
>
> Key: HDFS-15
> URL: https://issues.apache.org/jira/browse/HDFS-15
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.3
> Reporter: Hairong Kuang
> Assignee: Jitendra Nath Pandey
> Priority: Critical
> Fix For: 0.20.3, 0.21.0
>
> Attachments: hdfs-15-b20-1.patch, HDFS-15.4.patch, HDFS-15.5.patch,
> HDFS-15.6.patch, HDFS-15.patch, HDFS-15.patch.2, HDFS-15.patch.3
>
>
> HDFS replicas placement strategy guarantees that the replicas of a block
> exist on at least two racks when its replication factor is greater than one.
> But fsck still reports that the replicas of some blocks end up on one rack.
> The cause of the problem is that decommission and corruption handling only
> check the block's replication factor but not the rack requirement. When an
> over-replicated block loses a replica due to decomission, corruption, or
> heartbeat lost, namenode does not take any action to guarantee that remaining
> replicas are on different racks.
>
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