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Date: Fri, 18 Jan 2013 11:38:13 +0000 (UTC)
From: "Zesheng Wu (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12628176.1358498619127.158237.1358509093721@arcas>
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Subject: [jira] [Commented] (HADOOP-9223) support specify config items
 through system property
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    [ https://issues.apache.org/jira/browse/HADOOP-9223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557155#comment-13557155 ] 

Zesheng Wu commented on HADOOP-9223:
------------------------------------

Thanks for your quick reply!
1. In the patch, I added a prefix 'hadoop.property.' for config items, this intends to differ the config items passed by -D'hadoop.property.$name=$value' from the current normal options passed by -D'$name=$value', I do understand your worry, which is also mine, considering this, I added the prefix, which just acts like a switch:)
2. About the order of preference, it's just the same as what you said, a system property is more preferred than a file. I will add some tests, and submit it later
3. Sorry about the my mistake of error specifying of the version:(
                
> support specify config items through system property
> ----------------------------------------------------
>
>                 Key: HADOOP-9223
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9223
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 2.0.0-alpha
>            Reporter: Zesheng Wu
>            Priority: Minor
>              Labels: configuration, hadoop
>         Attachments: HADOOP-9223.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> The current hadoop config items are mainly interpolated from the *-site.xml files. In our production environment, we need a mechanism that can specify config items through system properties, which is something like the gflags in system built with C++, it's really very handy.
> The main purpose of this patch is to improve the convenience of hadoop systems, especially when people do testing or perf tuning, which always need to modify the *-site.xml files
> If this patch is applied, then people can start hadoop programs in this way: java -cp $class_path -Dhadoop.property.$name=$value $program

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