Joseph Dell'Aringa created HDFS-17642:
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             Summary: Support specifying Datanodes to exclude for balancing at 
source/target granularity
                 Key: HDFS-17642
                 URL: https://issues.apache.org/jira/browse/HDFS-17642
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer
            Reporter: Joseph Dell'Aringa
            Assignee: Joseph Dell'Aringa


In some cases it can be useful to exclude a list of datanodes from being 
selected as a target but remaining an option for a source and vice-versa. 

The fix for this ticket will add an additional exclude list for source and 
target datanodes.



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