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Date: Mon, 15 Nov 2010 17:34:13 -0500 (EST)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-7036) spellcheck for configuration
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    [ https://issues.apache.org/jira/browse/HADOOP-7036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932236#action_12932236 ] 

Allen Wittenauer commented on HADOOP-7036:
------------------------------------------

Errr, don't we just need a schema definition and we can do this with any number of xml tools?

> spellcheck for configuration
> ----------------------------
>
>                 Key: HADOOP-7036
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7036
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: conf
>            Reporter: Ari Rabkin
>            Assignee: Ari Rabkin
>         Attachments: confspellcheck.jar, hadoopSpellcheck.patch
>
>
> Hadoop does fairly limited correctness checks of its configuration. I propose a "configuration spellcheck" that can automatically catch errors, and particularly can catch cases where users mis-type the name of an option.
> The system works as follows:
> - Use program analysis to extract the set of options supported by each Hadoop version, annotated when possible with their types into a 'dictionary file'.
> - Distribute these extracted sets, per version.
> - A script that reads a dictionary file, reads the Hadoop config from a specified directory, and reports deviations. In particular, the system can report when an option is set that Hadoop will never read or when an invalid value is specified.

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