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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7573) hadoop should log configuration reads
Date Wed, 24 Aug 2011 00:33:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089900#comment-13089900
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Ari Rabkin commented on HADOOP-7573:
------------------------------------

The intended audience for these log messages is neither users nor developers -- it's supporters
who are brought in once a problem appears. That means it'll be experts able to interpret the
messages, but who won't have the opportunity to add debug statements.  

Having a separate logger makes sense; I will do that.

The per-instanceness is a problem; thanks for highlighting that. Open to suggestions here.
Is it crazy to make it static? Once-per-program is the desired functionality. But I'd like
to have it on-by-default; assuming once per program, the volume of messages will be low. And
reproducing problems is a significant source of time and trouble, so getting the right debug
info the first time is important.

> hadoop should log configuration reads
> -------------------------------------
>
>                 Key: HADOOP-7573
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7573
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 0.20.203.0
>            Reporter: Ari Rabkin
>            Assignee: Ari Rabkin
>            Priority: Minor
>             Fix For: 0.20.206.0
>
>         Attachments: HADOOP-7573.patch, HADOOP-7573.patch
>
>
> For debugging, it would often be valuable to know which configuration options ever got
read out of the Configuration into the rest of the program -- an unread option didn't cause
a problem. This patch logs the first time each option is read.

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