[jira] Commented: (HADOOP-5073) Hadoop 1.0 Interface Classification - scope (visibility - public/private) and stability

["Jiaqi Tan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-5073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723738#action_12723738 ] 

Jiaqi Tan commented on HADOOP-5073:
-----------------------------------

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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