Zehao Chen created HDFS-15821:
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Summary: Add metrics for in-service datanodes
Key: HDFS-15821
URL: https://issues.apache.org/jira/browse/HDFS-15821
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Zehao Chen
Assignee: Zehao Chen
We currently have metrics for live datanodes but some of the datanodes may be
in decommissioning state or maintenance state. Adding this metric allows us to
know how many nodes are currently in service, where NumInServiceDatanodes =
NumLiveDataNodes - NumDecomLiveDataNodes - NumInMaintenanceLiveDataNodes.
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