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https://issues.apache.org/jira/browse/HDFS-8880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14960683#comment-14960683
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Steve Loughran commented on HDFS-8880:
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I'd be in favour of improving our own general metrics sinks, rather than adding
new stuff to every service
# it just adds more stuff to maintain, to test, to document and debug
# it's not broadly re-usable
# it adds 1/thread service, which in test runs could be many more per vm.
I note that Coda Hale metrics has a [stdout
streamer|https://dropwizard.github.io/metrics/3.1.0/getting-started/] for such
purposes.
If we were to do things with metrics, codahale integration would seem a good
strategy (though the transitive LGPL dependency on the ganglia reporter is
something to be aware of)
> NameNode metrics logging
> ------------------------
>
> Key: HDFS-8880
> URL: https://issues.apache.org/jira/browse/HDFS-8880
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Fix For: 2.8.0
>
> Attachments: HDFS-8880.01.patch, HDFS-8880.02.patch,
> HDFS-8880.03.patch, HDFS-8880.04.patch, namenode-metrics.log
>
>
> The NameNode can periodically log metrics to help debugging when the cluster
> is not setup with another metrics monitoring scheme.
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