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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-673) Remove yarn-default.xml
Date Sat, 11 May 2013 00:19:16 GMT
Siddharth Seth created YARN-673:

             Summary: Remove yarn-default.xml
                 Key: YARN-673
                 URL: https://issues.apache.org/jira/browse/YARN-673
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Siddharth Seth

The default configuration files serve 2 purposes
1. Documenting available config parameters, and their default values.
2. Specifying default values for these parameters.

An xml file hidden inside a jar is not necessarily the best way to document parameters. This
could be moved into the documentation itself.
Default values already exist in code for most parameters. There's no need to specify them
in two places. We need to make sure defaults exist for all parameters before attempting this.

Having default configuration files just bloats job conf files; over 450 parameters, out of
which <20 are likely job specific params. JobConf files end up being rather big, and the
memory footprint of the conf object is large (>300KB last I checked).

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