How to use multi-thread consumer in kafka 0.9.0?

Question

The doc of kafka give an approach about with following describes:

One Consumer Per Thread:A simple option is to give each thread its own consumer > in

Answer 1

It is throwing the exception on your call to subscribe. this.consumer.subscribe(topicName);

Move that block into a synchronized block like this:

@Override
public void run() {
    try {
        synchronized (consumer) {
            this.consumer.subscribe(topicName);
        }
        ConsumerRecords records;
        while (!closed.get()) {
            synchronized (consumer) {
                records = consumer.poll(100);
            }
            for (ConsumerRecord tmp : records) {
                System.out.println(tmp.value());
            }
        }
    } catch (WakeupException e) {
        // Ignore exception if closing
        System.out.println(e);
        //if (!closed.get()) throw e;
    }
}