Provide a way for components to perform some processes on driver node only, in distributed systems.

New components framework is designed to provide possibility to run tasks in distributed environments. Components Runtimes might be run on different nodes in a cluster. But sometimes we have some processes that should be performed on driver nodes only, for example some processes which are dependent on file system(some files should be uploaded/downloaded to/from file system).
We have to provide some method/interface to run such processes on driver node and not to delegate run of those tasks to cluster nodes.

(IG): UPD
RuntimableRuntime interface was derived from SourceOrSink. Its initialize() method is supposed to be called on driver node.
So, there is an API method for some piece of work to be done on Driver node (only preprocessing ).
Also we may need a method for postprocessing stuff, but it is not clear for the moment.

As for full job, which should be run on driver node. We don't know examples for the moment. We don't know if it is required for us.
Also there is List<? extends BoundedSource> splitIntoBundles() method. Component may return one Source in the returned List to tell that job should be performed on single node.

So, may we consider this task as finished (RuntimableRuntime interface was created?)
Also there is ComponentDriverInitialization interface