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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3772) Proposed hadoop instrumentation API
Date Mon, 21 Jul 2008 17:59:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615334#action_12615334

Ari Rabkin commented on HADOOP-3772:

As mentioned above -- no test cases included, since this is a refactoring, with no functional

> 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
>         Attachments: instrumentation-2.patch, instrumentation-3.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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