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From Ankur Garg <>
Subject Re: Introduce lag into a topology spout to process the events with a delay.
Date Tue, 21 Feb 2017 19:09:58 GMT
Hi Sandeep ,

One question :- how are you reading Streams B and A . Are u reading from
some messaging queue (Kafka , Rabbit Mq etc.) with some spout (as part of
some topology) reading from them . Please confirm .


On Tue, 21 Feb 2017 at 15:28 Sandeep Samudrala <> wrote:

> Hello,
>  I have two streams A and B. I need to enrich events coming from stream B
> with events coming from A and I store events coming from A in a key-value
> store to enrich events from B. Events that doesn't get enriched are sent to
> a deferred queue(kafka stream) and are read back later.
> Most of the the time the events from Stream B are sent to defer queue
> because of bit delay in storing the events into a key-value store from
> Stream A and events coming into A and B are almost real time.
> I want to introduce a delay into reading into my spout reading from Stream
> B so as to make sure higher % of events get enriched in first shot rather
> than getting enriched post reading from defer queue. I tried putting a
> check on the lag and controlling on the backlog queue to get a hold but
> didn't seemed right and would enter into draining and other issues.
> Is there a way in the kafka consumer or Storm spout to control the data in
> flow to come with delay for processing?
> Thanks,
> -sandeep.

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