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From "Adam Whitlock (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12131) Add some of the FSNamesystem JMX values as metrics
Date Wed, 06 Sep 2017 22:46:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156149#comment-16156149
] 

Adam Whitlock commented on HDFS-12131:
--------------------------------------

[~shv] and [~xkrogen] - Thank you!

> 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, 2.7.5
>
>         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-2.7.006.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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