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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