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From Sandeep Samudrala <>
Subject Re: Introduce lag into a topology spout to process the events with a delay.
Date Wed, 22 Feb 2017 05:52:26 GMT
Yes. I am reading both the streams from kafka as part of a topology.

On Wed, Feb 22, 2017 at 12:39 AM, Ankur Garg <> wrote:

> 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 .
> Thanks
> Ankur
> 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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