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https://issues.apache.org/jira/browse/HADOOP-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624670#action_12624670
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Hudson commented on HADOOP-3772:
--------------------------------
Integrated in Hadoop-trunk #581 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])
> 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
> Assignee: Ari Rabkin
> Fix For: 0.19.0
>
> Attachments: instrumentation-2.patch, instrumentation-3.patch,
> instrumentation-4.patch, instrumentation.patch, tweak_inst.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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