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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7036) spellcheck for configuration
Date Wed, 15 Dec 2010 19:20:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971795#action_12971795
] 

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

I've been overloaded with other things and am only now getting back to this.  I'm still unsure
what the right way to package this is.

- The jar is now on maven.
- I have separate HDFS and MapReduce dictionary files.

Where should I put the script that launches the thing?  Separate scripts for MapReduce and
HDFS? That seems very wasteful.

Do I need to open a pair of new JIRAs, one each for MAPREDUCE and HDFS?

> 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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