It depends on how you defined your topology. If you created a topology made of one spout, two streams and a bolt, then the data received from the spout is going to go down to the bolt via those two streams. Spouts and bolts are connected through streams.


On Wednesday, January 6, 2016 3:01 PM, Ankur Garg <> wrote:

Hi John , 

I am not aware of the storm internal working so I am not sure about this . But since no one has answered this so far , I will try my hand .

I believe Spouts and Bolts communicate through an intermediate queue (ZMQ) . Assuming this it should always be a single connection to ZMQ . 

But Like I said , this is what I think should be the case . Waiting for any of the member to validate/invalidate  this.


On Wed, Jan 6, 2016 at 7:47 AM, John Yost <> wrote:
Hi Everyone,

Had a co-worker ask me today if, I define two output streams for a spout or bolt, do they both go out over the same connection to a downstream bolt, or are there separate connections for each output stream.

Anyone know?