Producer
Related Docs:
object Producer
| package summingbird
Exactly the same as merge.
Exactly the same as merge. Here by analogy with the scala.collections API
Prefer to flatMap for transforming a subset of items like optionMap but convenient with case syntax in scala prod.collect { case x if fn(x) => g(x) }
Merge a different type of Producer into a single stream
Keep only the items that satisfy the fn
Only use this function if you may return more than 1 item sometimes.
Only use this function if you may return more than 1 item sometimes. otherwise use collect or optionMap, which can be pushed up the graph
This is identical to a certain leftJoin: map((_, ())).leftJoin(srv).mapValues{case (_, v) => v} Useful when you are looking up values from say a stream of inputs, such as IDs.
Map each item to a new value
Combine the output into one Producer
Naming a node is so that you may give Options for that node that may change the run-time performance of the job (parameter tuning, etc...)
Prefer this or collect to flatMap if you are always emitting 0 or 1 items
Cause some side effect on the sink, but pass through the values so they can be consumed downstream
A Producer is a node in our tree, able to generate new items and have operations applied to it. In Storm, this might be an in-progress TopologyBuilder.