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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7036) spellcheck for configuration
Date Mon, 15 Nov 2010 23:37:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932260#action_12932260
] 

Ari Rabkin commented on HADOOP-7036:
------------------------------------

It is already a separate project, on Google Code; it's a subcomponent of http://code.google.com/p/jchord/

But I thought it made sense to include the Hadoop-specific scripts and the [hopefully human-checked]
Hadoop dictionary files in Hadoop contrib. This improves visibility and also benefits the
Hadoop community by helping users avoid what I gather is a significant problem -- mis-spelled
option names.

> 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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