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https://issues.apache.org/jira/browse/HADOOP-8630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632007#comment-13632007
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Steve Loughran commented on HADOOP-8630:
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I've just had a look at this again and think that it's simpler to stick with
the {{isSingleSwitch()}} terms as the code has been out there too long. I
should have reviewed it earlier.
marking as WONTFIX.
> 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-8630.2.patch, 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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