defgetKeepAliveFunction(implicit flowDef: FlowDef): () ⇒ Unit
For serialization, you may need to do:
val keepAlive = RuntimeStats.getKeepAliveFunction
outside of a closure passed to map/etc..., and then call:
keepAlive()
inside of your closure (mapping, reducing function)
Wrapper around a FlowProcess useful, for e.g. incrementing counters.