Share data between multiple topologies in Apache Storm

Question

I have basic question about Apache Storm. Can we share data between two different topologies? So if I have topology A which has

Spout_A >> Ab1 > Ab2 > Ab3

bolts and the I want a new topology B in want to reuse the output of Ab2 like

Spout_B >> Bb1 > Ab2 > Bb2.

Note:These two topologies mentioned above are different Storm applications.

Answer 1

Ab2 can write to some message bus (additional bolt) in addition to the regular operation of Ab3

The second topology can listen to that bus