fuchaohong created HDFS-17938:
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             Summary: Add the metrics NumBlocks in datanode.
                 Key: HDFS-17938
                 URL: https://issues.apache.org/jira/browse/HDFS-17938
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
            Reporter: fuchaohong


Add the NumBlocks metric, which can be used to warn about the heap size of the 
DataNode.



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