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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12131) Add some of the FSNamesystem JMX values as metrics
Date Mon, 31 Jul 2017 21:26:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16107978#comment-16107978
] 

Andrew Wang commented on HDFS-12131:
------------------------------------

Sure, let's do the deprecate+removal in separate JIRAs for clarity.

Some of the new metrics do not have unit test coverage. Could we add this?

> 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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