'How does Apache Storm manage its spouts?

Let's take an example of a topology which has more than one Kafka Spouts (or any other kind of spouts), now questions I have -

  • Which spout should consume the messages first - how is this determined?
  • Does each spout spin up its own thread?
  • Should Bolts be thread safe if each spout has its own thread?
  • Is there a way to give priority to one spout on another?
  • If there is a back pressure behind one spout, does this back pressure then transmitted to another spout as well?
apache-storm


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