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From "Steve Loughran (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7777) Implement a base class for DNSToSwitchMapping implementations that can offer extra topology information
Date Thu, 27 Oct 2011 16:42:32 GMT
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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