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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12131) Add some of the FSNamesystem JMX values as metrics
Date Fri, 28 Jul 2017 19:17:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105527#comment-16105527

Erik Krogen commented on HDFS-12131:

Okay, that seems fair. Should we have a separate JIRA for fixing up all of the remaining inconsistent
ones in FSNamesystem to be able to more clearly link that to the eventual removal JIRA?

> 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
> 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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