farmmamba created HDFS-17171:
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             Summary: CONGESTION_RATIO should be configurable
                 Key: HDFS-17171
                 URL: https://issues.apache.org/jira/browse/HDFS-17171
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 3.4.0
            Reporter: farmmamba


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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