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https://issues.apache.org/jira/browse/HDFS-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erik Krogen updated HDFS-12131:
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Attachment: HDFS-12131-branch-2.8.006.patch
HDFS-12131-branch-2.006.patch
HDFS-12131.006.patch
Great [~andrew.wang], thanks! When putting together the branch-2 patch I
noticed two small issues in my trunk patch - a few of the new additions to
Metrics.md did not have correct formatting (missing a pipe at the end of the
line) and I didn't close the {{FsVolumeReferences}} object that I obtained in
{{TestNameNodeMetrics#testVolumeFailures()}}. Fixed those two in v006 patch,
and attached corresponding branch-2 and branch-2.8 patches.
> 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
> 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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