Add number of active transfer threads to the DataNode metrics
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Key: HDFS-2868
URL: https://issues.apache.org/jira/browse/HDFS-2868
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Affects Versions: 0.23.0
Reporter: Harsh J
Assignee: Harsh J
Priority: Minor
Presently, we do not provide any metrics from the DN that specifically
indicates the total number of active transfer threads (xceivers). Having such a
metric can be very helpful as well, over plain num-ops(type) form of metrics,
which already exist.
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