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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6711) Configuration should support list of values
Date Fri, 16 Apr 2010 06:33:25 GMT
Configuration should support list of values
-------------------------------------------

                 Key: HADOOP-6711
                 URL: https://issues.apache.org/jira/browse/HADOOP-6711
             Project: Hadoop Common
          Issue Type: New Feature
          Components: conf
            Reporter: Amar Kamat


Configuration supports 2 operations namely _set()_ and _get()_. It would be nice to have an
inbuild support for lists where there can be multiple values (i.e list of values) assigned
to one key. A workaround could be
{code}
// Assume Key be the parameter key and newValue be the value to be added/appended
Configuration c = new Configuration();
String value = c.get(Key);
value = value + " " + newValue
c.set(Key, value);
{code}

One common usecase is that in a production enviroment, some user facing params (e.g mapred.child.java.opts)
are set to default values (say for performance reasons). Users themselves might want to *add*
to this list. Doing a set would overwrite the previous values. The above mentioned hack is
doable via code but not via command line. Hence we need the framework to support lists.


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