AFAIK it's not implemented yet in storm. There's a plan for a swap command to swap in an updated topology on the fly with zero downtime, but I have no idea when will that be available.

On Feb 4, 2017 11:22 AM, "anshu shukla" <anshushukla0@gmail.com> wrote:
Hello,

I was playing around with Flux for running DAGs with Storm.  I  am curious to know that Is there any way to update the running topology on the fly using Flux (something like rebalance to update parallelism).  

I found this in the documentation:-
" Flux aims to alleviate that pain by allowing you to package all your Storm components in a single jar, and use an external text file to define the layout and configuration of your topologies."

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Thanks & Regards,
Anshu Shukla