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https://issues.apache.org/jira/browse/HDFS-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113661#comment-16113661
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Hudson commented on HDFS-12131:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12114 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/12114/])
HDFS-12131. Add some of the FSNamesystem JMX values as metrics. (wang: rev
f4c6b00a9f48ae7667db4035b641769efc3bb7cf)
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
* (edit) hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java
> 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
> Fix For: 2.9.0, 3.0.0-beta1, 2.8.3
>
> Attachments: HDFS-12131.000.patch, HDFS-12131.001.patch,
> HDFS-12131.002.patch, HDFS-12131.002.patch, HDFS-12131.003.patch,
> HDFS-12131.004.patch, HDFS-12131.005.patch, HDFS-12131.006.patch,
> HDFS-12131-branch-2.006.patch, HDFS-12131-branch-2.8.006.patch
>
>
> 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
> * VolumeFailuresTotal
> * EstimatedCapacityLostTotal
> * NumInMaintenanceLiveDataNodes
> * NumInMaintenanceDeadDataNodes
> * NumEnteringMaintenanceDataNodes
> This is a simple change that just requires annotating the JMX methods with
> {{@Metric}}.
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