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From Ewen Cheslack-Postava <e...@confluent.io>
Subject Re: Kafka Connect Consumer reading messages from Kafka recursively
Date Tue, 03 Jan 2017 19:59:04 GMT
On Tue, Jan 3, 2017 at 8:38 AM, Srikrishna Alla <allasrikrishna1@gmail.com>

> Hi,
> I am using Kafka/Kafka Connect to track certain events happening in my
> application. This is how I have implemented it -
> 1. My application is opening a KafkaProducer every time this event happens
> and writes to my topic. My application has several components running in
> Yarn and so I did not find a way to have just one producer and reuse it.
> Once the event has been published, producer is closed

KafkaProducer is thread safe, so you can allocate a single producer per
process and use it every time the event occurs on any thread. Creating and
destroying a producer for every event will be very inefficient -- not only
are you opening new TCP connections every time, having to lookup metadata
every time, etc, you also don't allow the producer to get any benefit from
batching so every message will require its own request/response.

> 2. I am using Kafka Connect Sink Connector to consume from my topic and
> write to DB and do other processing.
> This setup is working great as long as we have a stable number of events
> published. The issue I am facing is when we have a huge number of events(in
> thousands within minutes) hitting Kafka. In this case, my Sink Connector is
> going into a loop and reading events from Kafka recursively and not
> stopping. What could have triggered this? Please provide your valuable
> insights.

What exactly do you mean by "reading events from Kafka recursively"? Unless
it's hitting some errors that are causing consumers to fall out of the
group uncleanly and then rejoin later, you shouldn't be seeing duplicates.
Is there anything from the logs that might help reveal the problem?


> Thanks,
> Sri

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