Maybe I am missing something, but if there is no stateful task, we don't create 
the `StateDirectory ` -- and task directories are nested within 
`StateDirectory`:
```
StateDirectory == /<state.dir/<application.id>/

overall:
/<state.dir>/<application.id>/<task.id>/<store>
```
>From my understanding, the ticket addresses the case that there is no disk. If 
>there is disk, and there is one stateful task, we can also create task 
>directories from stateless task -- I agree that it would be ok to not create 
>them, but this increase code complexity and the gain seems to be small?

Thoughts?

[ Full content available at: https://github.com/apache/kafka/pull/5696 ]
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