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https://issues.apache.org/jira/browse/HADOOP-6711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858010#action_12858010
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Jitendra Nath Pandey commented on HADOOP-6711:
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Configuration has a getStringCollection API : public Collection<String>
getStringCollection(String name)
There is no such set method though.
> 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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