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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7573) hadoop should log configuration reads
Date Tue, 23 Aug 2011 20:10:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089715#comment-13089715
] 

Ari Rabkin commented on HADOOP-7573:
------------------------------------

I've done some measurements that suggest that for configuration errors that cause failures
at startup, the most-recently-read option is the one most likely at fault. Hence, this patch
could help users diagnose configuration errors.

 (This work will be presented at the IEEE/ACM Conference On Automated Software Engineering
in November).

> 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
>         Attachments: 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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