Hi, should a spout block on its source to produce a tuple?
For example, should it read its source from a blocking queue before emit? In this case, the spout will indefinitely block before it can emit a tuple. I read about how ack and fail are processed on the same thread. 1) Will blocking in spout's nextTuple result in blocking the downstream bolts? 2) How about when a messageId is not specified? 3) How about when a tuple traverses multiple JVM instances on the same or cross machines? Kind regards << �gA mind is like a parachute. It doesn't work if it is not open�h Frank Zap >>
