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https://issues.apache.org/jira/browse/HADOOP-5073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723738#action_12723738
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Jiaqi Tan commented on HADOOP-5073:
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I would like to propose that a particular subset of logging statements
currently in Hadoop be made Public-Evolving, and eventually Public-Stable, for
the purpose of lightweight tracing for studying Hadoop behavior. This has
various applications, such as for diagnosing failures and visualizing behavior,
and using log statements that are already being currently generated gives us a
nice, low-overhead way for doing this.
We have been using Hadoop logs for diagnosis for some time now, and while the
log statements have been relatively stable, we have had to make minor parser
modifications between Hadoop versions, and there is currently no guarantee that
the statements we find useful will be here to stay. It would be nice if we can
articulate some of the existing log statements that help us in diagnosis, and
if those statements can be made part of a public interface. Then, parsing and
analysis tools can be produced based on this stable interface.
This also relates to Chukwa, as far as us implementing our log-based analysis
and diagnosis tools as part of the Chukwa project.
> Hadoop 1.0 Interface Classification - scope (visibility - public/private) and
> stability
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-5073
> URL: https://issues.apache.org/jira/browse/HADOOP-5073
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
>
> This jira proposes an interface classification for hadoop interfaces.
> The discussion was started in email alias core-dev@hadoop.apache.org in Nov
> 2008.
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