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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3772) Proposed hadoop instrumentation API
Date Mon, 28 Jul 2008 19:39:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617527#action_12617527

Hadoop QA commented on HADOOP-3772:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 679930.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2961/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2961/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2961/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2961/console

This message is automatically generated.

> 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-4.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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