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  1. Hadoop HDFS
  2. HDFS-17171

CONGESTION_RATIO should be configurable

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      Currently, The valuee of DataNode#CONGESTION_RATIO is 1.5 and it is not configurable.

      When the average load of a datanode in last one minute is higer than CONGESTION_RATIO * NUM_CORES, this datanode will be regard as CONGESTED. 

      In most real production envs,  the default value 1.5 seems not appropriate. So ,we should change this value to be configurable.

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            zhanghaobo farmmamba Assign to me
            zhanghaobo farmmamba
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