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https://issues.apache.org/jira/browse/HADOOP-2767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567008#action_12567008
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Hudson commented on HADOOP-2767:
--------------------------------
Integrated in Hadoop-trunk #394 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/394/])
> org.apache.hadoop.net.NetworkTopology.InnerNode#getLeaf does not return the
> last node on a rack when used with an excluded node
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2767
> URL: https://issues.apache.org/jira/browse/HADOOP-2767
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.15.3
> Reporter: Mark Butler
> Assignee: Hairong Kuang
> Priority: Minor
> Fix For: 0.17.0
>
> Attachments: excludedLeaf.patch, excludedLeaf2.patch,
> excludedLeaf3.patch, excludedLeaf4.patch, NetworkTopologyTest.java
>
>
> I have written some test code that shows NetworkTopology.InnerNode#getLeaf
> will never return the last node on the rack if it is called with an
> excludedNode (for example the first node on the rack).
> Consequently I suspect that NetworkTopology.chooseRandom() will never returns
> the last node on the remote rack for the second replica in DFS.
> I have some test code that demonstrates this problem at the getLeaf level,
> although it is necessary to change the visibility of the
> NetworkTopology.InnerNode, NetworkTopology.InnerNode#getLeaf and
> NetworkTopology.getNode from private to package default to run the test.
> TODO: Demonstrate problem at NetworkTopology.chooseRandom level, then submit
> candidate fix.
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