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https://issues.apache.org/jira/browse/HADOOP-9223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557099#comment-13557099
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Zesheng Wu commented on HADOOP-9223:
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For example, we implemented a deploy and manage toolkit for our hadoop
clusters, most of the operations are done in shell command line, we do not want
to specify several config files for each cluster, we use the toolkit to
generate the config at runtime, and pass it by '-Dhadoop.property.$key=$value',
it's really handy:)
> 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
> Fix For: 2.0.0-alpha
>
> 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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