Configuration should support list of values
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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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