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Kafka >> mail # user >> Kafka producer - jump start


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Guy Doulberg 2012-10-03, 15:27
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Jun Rao 2012-10-03, 16:18
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Re: Kafka producer - jump start
Sorry.

Unfourtently I didn't keep them...

I realized it only after I solved the problem.....which was too late....
I can't reproduce....

Jun Rao <[EMAIL PROTECTED]> כתב:
Guy,

A single producer is fine. Under the cover, it will create 1 async producer
thread per broker. Haven't seen this issue before. Could you post the stack
trace?

Thanks,

Jun

On Wed, Oct 3, 2012 at 8:27 AM, Guy Doulberg <[EMAIL PROTECTED]>wrote:

> Hi guys,
>
> I had today a production problem with the Kafka producer (version 0.7.1),
>
> I have web front end HTTP server that produces events using the async
> kafka producer.
> The design is that the kafka producer is a singleton,
>
> I often restart that HTTP server, and most of the time I could see booting
> up the Kafka producer doesn't take too long, and eventually I am ending up
> with a single kafka producer...
>
>
> Today something went wrong, and I could idnetify locks on my server, using
> jstack I saw that all my locks are from the producer initializing,
> specifically in the method:  getZKBrokerInfo
>
>
> Thinking my bottleneck was the Zookeeper I restarted (one after another)
> its nodes, this didn't solve the problem,
>
>
> Without having a plan, I restarted one of the kafka borker (I have 3) ,
> magically it solved the problem....
>
> I am trying to understand what was the problem,
>
> could it be that when  producer wakes up - it tries to connect each of the
> brokers, and the broker I picked was not responding?  - I have service that
> monitor load on my broker machines and I had no indication of such load,
> moreover I have service that check if a broker responds to 9092 and this
> broker responded.
>
> If a broker doesn't respond, shouldn't the producer drop  this broker, and
> use only the others?
>
> Anyhow, I am not expecting any of you to know what exactly happened to my
> producer, but I am trying to understand more the producer init process,
> maybe I should create a connection to the kafka broker earlier in my app
> life cycle.
>
> I am also trying to figure out why there is a synchronized code in the
> producer, should I not use a single producer?
>
>
> Thanks
> Guy Doulberg
> Data infrastructure engineer
>
>
>
>
>
>
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Guy Doulberg 2012-10-04, 07:14