[jira] Commented: (HADOOP-2866) JobConf should validate key names in well-defined namespaces and warn on misspelling

["Ryan Smith (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626670#action_12626670 ] 

Ryan Smith commented on HADOOP-2866:
------------------------------------

+1

Instead of using :

jobConf.set(String key,String value)

I vote for using getters/setters (spring configurable) to pass just the value:

jobConf.setSomeProperty(String value)

And using constructors to instantiate objects (or at least offer it as an option).
Off hand, i know DistributedFileSystem() could benefit from a 2 arg constructor that calls initialize(arg1,arg2) so
DI frameworks like spring are supported.
I would be interested in submitting a patch soon for some of these config access issues on a one or two other classes.
Ill add the patch here or start a new issue for it, please let me know.
Thanks,

-Ryan

> JobConf should validate key names in well-defined namespaces and warn on misspelling
> ------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2866
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2866
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Aaron Kimball
>            Priority: Minor
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> A discussion on the mailing list reveals that some configuration strings in the JobConf are deprecated over time and new configuration names replace them:
> e.g., "mapred.output.compression.type" is now replaced with "mapred.map.output.compression.type"
> Programmers who have been manually specifying the former string, however, receive no diagnostic output during testing to suggest that their compression type is being silently ignored.
> It would be desirable to notify developers of this change by printing a warning message when deprecated configuration names are used in a newer version of Hadoop. More generally, when any configuration string in the mapred.\*, fs.\*, dfs.\*, etc namespaces are provided by a user and are not recognized by Hadoop, it is desirable to print a warning, to indicate malformed configurations. No warnings should be printed when configuration keys are in user-defined namespaces (e.g., "myprogram.mytask.myvalue").

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