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https://issues.apache.org/jira/browse/HADOOP-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167156#comment-13167156
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Steve Loughran commented on HADOOP-7878:
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Because I believe the javadocs are a false alarm, I am +1 to putting into trunk
and 0.23
> Regression HADOOP-7777 switch changes too clever for the StaticMapping
> ----------------------------------------------------------------------
>
> Key: HADOOP-7878
> URL: https://issues.apache.org/jira/browse/HADOOP-7878
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Labels: regression
> Attachments: HADOOP-7878.patch, HADOOP-7878.patch
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> This doesn't show up until you apply the HDFS-2492 patch, but the attempt to
> make the {{StaticMapping}} topology clever by deciding if it is single rack
> or multi rack based on its rack->node mapping breaks the HDFS
> {{TestBlocksWithNotEnoughRacks}} test. Why? Because the racks go in after the
> switch topology is cached by the {{BlockManager}}, which assumes the system
> is always single-switch.
> Fix: default to assuming multi-switch; remove the intelligence, add a setter
> for anyone who really wants to simulate single-switch racks.
> Test: verify that a newly created simple mapping is multi switch
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