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Posted to common-dev@hadoop.apache.org by "Zesheng Wu (JIRA)" <ji...@apache.org> on 2013/01/18 09:44:15 UTC

[jira] [Created] (HADOOP-9223) support specify config items through system property

Zesheng Wu created HADOOP-9223:
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             Summary: 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
             Fix For: 2.0.0-alpha


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 for 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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