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