Which nodes use metadata storage?

Are coordinator, realtime and indexing service the only Druid node types that use metadata storage? Do broker or historical nodes use metadata storage at all?

Within the indexing service, is it just peon tasks that use metadata storage? Do overlord or middle-manager use metadata storage at all?

Just trying to pare down the extensions and configs in our various nodes.

Thanks,

Zach

The coordinator, overlord, standalone realtime nodes, and standalone hadoop indexer use metadata storage. The broker, historical nodes, middle managers, and peons do not.

There is also some more docs about this here: http://druid.io/docs/0.7.0/Design.html