Erik Krogen created HDFS-12131:
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Summary: Add some of the FSNamesystem JMX values as metrics
Key: HDFS-12131
URL: https://issues.apache.org/jira/browse/HDFS-12131
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs, namenode
Reporter: Erik Krogen
Assignee: Erik Krogen
Priority: Minor
A number of useful numbers are emitted via the FSNamesystem JMX, but not
through the metrics system. These would be useful to be able to track over
time, e.g. to alert on via standard metrics systems or to view trends and rate
changes:
* NumLiveDataNodes
* NumDeadDataNodes
* NumDecomLiveDataNodes
* NumDecomDeadDataNodes
* NumDecommissioningDataNodes
* NumStaleStorages
This is a simple change that just requires annotating the JMX methods with
{{@Metric}}.
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