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https://issues.apache.org/jira/browse/HADOOP-8630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428414#comment-13428414
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Steve Loughran commented on HADOOP-8630:
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patch + a pull is best. Note that that specific branch on github includes a
place in DFS where it's actually used -that bit isn't part of the patch for
common; two patches need to be created from the source tree
> rename isSingleSwitch() methods in new topo base class to isFlatTopology()
> --------------------------------------------------------------------------
>
> Key: HADOOP-8630
> URL: https://issues.apache.org/jira/browse/HADOOP-8630
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Steve Loughran
> Priority: Trivial
> Attachments: HADOOP-8630.patch
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> The new topology logic that is not yet turned on in HDFS uses the method
> {{isSingleSwitch()}} for implementations to declare whether or not they are
> single switch.
> The use of "switch" is an implementation issue; the big VM-based patch shows
> that really it's about "flat" vs "hierarchical", with Hadoop assuming that
> subtrees in the hierarchy have better bandwidth (good) but correlated
> failures (bad).
> Renaming the method now -before it's fixed and used- is time time to do it.
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