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From BYEONG-GI KIM <bg...@bluedigm.com>
Subject Re: Kafka Consumer Example source code seems not working correctly
Date Tue, 19 Jan 2016 06:26:15 GMT

I've been trying to debug the source code and I noticed that the execution
of source code was stopped at the lane "ConsumerRecords<String, String>
records = consumer.poll(100);". Furthermore, I also tested ProducerExample,
but it also seems not working correctly, at least the source code generated
messages and send these to kafka server via "producer.send(new
ProducerRecord<String, String>("test", "Hello!"));". However, the
"bin/kafka-console-consumer.sh" could not receive any message from the

It is really weird for me... What am I doing wrong? I think I set
topic/ip/port properly, at least.

Thanks in advance.

Best regards


2016-01-19 11:20 GMT+09:00 BYEONG-GI KIM <bgkim@bluedigm.com>:

> Hello. I'm a new who are getting started to learn Kafka.
> I'm now trying to develop a sample java source code to test the new Kafka
> Consumer, but it seems not working correctly. I've been testing both of
> Kafka Consumer versions; the old one called as High Level Consumer and
> another one called as a new Consumer which has been added at 0.9.0 version.
> The problem is that both of those example codes seems not be able to pull
> any messages from a kafka broker, while a sample Producer,
> kafka-console-producer.sh in kafka source package, is running.
> In detail, for example, when the Consumer Group Example source code
> described in
> https://cwiki.apache.org/confluence/display/KAFKA/Consumer+Group+Example
> was tested, it was automatically shutting down thread(s) after a while. I
> guess that the run() in ConsumerTest.java seems not working correctly,
> especially the "while" parts, because it did not show any println outputs
> that must show subscribed messages.
> Any advice and hint would greatly be helpful for me. Thanks in advance!
> Best regards
> bgkim

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