org.apache.kafka.streams.examples.wordcount.WordCountDemo does not terminate

Question

I have launched this script and it does not end.

sudo ./bin/kafka-run-class.sh org.apache.kafka.streams.examples.wordcount.WordCountDemo

Here is the result:

[cloudera@quickstart kafka_2.12-2.4.1]$ sudo ./bin/kafka-run-class.sh org.apache.kafka.streams.examples.wordcount.WordCountDemo
[2020-04-14 13:26:36,153] WARN The configuration 'admin.retries' was supplied but isn't a known config. (org.apache.kafka.clients.consumer.ConsumerConfig)
[2020-04-14 13:26:36,165] WARN The configuration 'admin.retry.backoff.ms' was supplied but isn't a known config. (org.apache.kafka.clients.consumer.ConsumerConfig)

It does not end.

Is ther any solution please?

Answer 1

This is the expected behaviour of the demo that you are using and you need to press ctrl-c to terminate the process.

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If you want the demo to stop after five seconds you can use the older version of the demo that terminates after 5 seconds:

// usually the stream application would be running forever,
// in this example we just let it run for some time and stop since the input data is finite.
Thread.sleep(5000L);