Allow dfs.balance.bandwidthPerSec to be specified at invocation time for 
balancer
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                 Key: HDFS-1293
                 URL: https://issues.apache.org/jira/browse/HDFS-1293
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer
            Reporter: Patrick Angeles


The dfs.balance.bandwidthPerSec parameter is read at Datanode start time. It 
would be nice to allow this parameter to be passed in when the balancer is 
invoked so, for example, it can be run during off-peak hours with a higher 
bandwidth setting.

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