Implement a base class for DNSToSwitchMapping implementations that can offer 
extra topology information
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                 Key: HADOOP-7777
                 URL: https://issues.apache.org/jira/browse/HADOOP-7777
             Project: Hadoop Common
          Issue Type: Improvement
          Components: util
    Affects Versions: 0.23.0
            Reporter: Steve Loughran
            Assignee: Steve Loughran


HDFS-2492 has identified a need for DNSToSwitchMapping implementations to 
provide a bit more topology information (e.g. whether or not there are multiple 
switches). This could be done by writing an extended interface, querying its 
methods if present and coming up with a default action if there is no extended 
interface. 

Alternatively, we have a base class that all the standard mappings implement, 
with a boolean isMultiRack() method; all the standard subclasses would extend 
this, as could any third party topology provider. The advantage of this 
approach is that it is easier to add new operations without going into a 
multi-interface mess.

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