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Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2012/07/28 02:31:34 UTC

[jira] [Created] (HADOOP-8630) rename isSingleSwitch() methods in new topo base class to isFlatTopology()

Steve Loughran created HADOOP-8630:
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             Summary: 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


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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