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From "Sybrandy, Casey" <Casey.Sybra...@Six3Systems.com>
Subject RE: use case with high rate of duplicate messages
Date Tue, 01 Oct 2013 18:01:14 GMT
Interesting.  I didn't know that Kafka had deduplication capabilities.  How do you leverage
it?  Also, is it supported in Kafka 0.7.x?

-----Original Message-----
From: Guozhang Wang [mailto:wangguoz@gmail.com] 
Sent: Tuesday, October 01, 2013 11:33 AM
To: users@kafka.apache.org
Subject: Re: use case with high rate of duplicate messages

Batch processing will increase the throughput but also increase latency, how large latency
your real-time processing can tolerate?

One thing you could try is to use the keyed messages, with key as the md5 hash of your message.
Kafka has a deduplication mechanism on the brokers that dedup messages with the same key.
All you need to do is setting the dedup frequency appropriately for your use case.

Guozhang


On Tue, Oct 1, 2013 at 8:19 AM, S Ahmed <sahmed1020@gmail.com> wrote:

> I have a use case where thousands of servers send status type 
> messages, which I am currently handling real-time w/o any kind of queueing system.
>
> So currently when I receive a message, and perform a md5 hash of the 
> message, perform a lookup in my database to see if this is a 
> duplicate, if not, I store the message.
>
> Now the message format can be either xml or json, and the actual 
> parsing of the message takes time so I would am thinking of storing 
> all the messages in kafka first and then batch processing these 
> messages in hopes that this will be faster to do.
>
> Do you think there would be a faster way of recognizing duplicate 
> messages this way or its just the same problem but doing it on a batch level?
>



--
-- Guozhang

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