Consider include/exclude files while listing datanodes.
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                 Key: HADOOP-1933
                 URL: https://issues.apache.org/jira/browse/HADOOP-1933
             Project: Hadoop
          Issue Type: Improvement
            Reporter: Raghu Angadi



While listing datanodes (e.g. in webui), consider the nodes listed in include 
and exclude files.

Proposed Rules :

# If a node is listed in include file, it should be listed
# If a node is listed under exclude file, it should not be listed unless it is 
not 'dead'.

Dhruba implies only the first rule applies towards the end of HADOOP-1138, 
i.e., a node should be listed if it exists either of the files. Dhruba, please 
clarify.


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