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https://issues.apache.org/jira/browse/HADOOP-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ari Rabkin updated HADOOP-3772:
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Attachment: instrumentation-2.patch
Corrects nits identified by Doug.
Note -- no test cases included, since it's basically a refactoring, and not a
new feature.
> Proposed hadoop instrumentation API
> -----------------------------------
>
> Key: HADOOP-3772
> URL: https://issues.apache.org/jira/browse/HADOOP-3772
> Project: Hadoop Core
> Issue Type: Improvement
> Components: metrics
> Reporter: Ari Rabkin
> Attachments: instrumentation-2.patch, instrumentation.patch
>
>
> We want to evolve the Hadoop metrics subsystem into a more generic
> Instrumentation facility. The ultimate goal is to add structured logging to
> Hadoop, with causal tags, a la X-trace. The existing metrics framework is
> not quite suitable for our needs, since the implementation and interface are
> tightly coupled. There's no way to use the metrics instrumentation points for
> anything other than metricss, and there's no way for a metrics context to
> find out what event just happened.
> We want to tease apart the generic notion of hookable instrumentation points,
> from the specifics of the information recording. The latter ought to be
> pluggable at run-time.
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