FAQ
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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postedApr 16, '10 at 6:33a
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