Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/328#issuecomment-145189910
I looked into this more.
The default interpreter for a given group is the first interpreter:
https://github.com/apache/incubator-zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/NoteInterpreterLoader.java#L131
```
// next, assume replName is 'group' of interpreter ('name' is
ommitted)
// search interpreter group and return first interpreter.
for (InterpreterSetting setting : settings) {
intpGroup = setting.getInterpreterGroup();
Interpreter interpreter = intpGroup.get(0);
```
In such case the `name` can be omitted and only the `group` is required.
I think this matches the behavior here.
It might be better if there is a way from a group of interpreters to decide
which is the default interpreter rather then the first one in
ZEPPELIN_INTERPRETERS
(https://github.com/apache/incubator-zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/conf/ZeppelinConfiguration.java#L396),
but that might over complicate the design.
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