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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