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From "Bart De Vylder (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-6026) Timeout on KafkaFuture not honoured
Date Mon, 09 Oct 2017 14:42:00 GMT
Bart De Vylder created KAFKA-6026:

             Summary: Timeout on KafkaFuture not honoured
                 Key: KAFKA-6026
                 URL: https://issues.apache.org/jira/browse/KAFKA-6026
             Project: Kafka
          Issue Type: Bug
          Components: admin
    Affects Versions:
            Reporter: Bart De Vylder

I would expect the following code to raise an Exception, either in the adminClient creation
or a TimeoutException when getting the future (there is no kafka running on localhost on that

        Properties config = new Properties();
        config.setProperty("bootstrap.servers", "localhost:1234");
        AdminClient admin = AdminClient.create(config);
        admin.listTopics().names().get(1, TimeUnit.SECONDS);

The code however seems to hang forever in the last step.

A possible cause for the behavior might be a bug in the KafkaFutureImpl class:
    private static class SingleWaiter<R> extends BiConsumer<R, Throwable> {

        R await(long timeout, TimeUnit unit)
                throws InterruptedException, ExecutionException, TimeoutException {
            long startMs = System.currentTimeMillis();
            long waitTimeMs = (unit.toMillis(timeout) > 0) ? unit.toMillis(timeout) : 1;
            long delta = 0;
            synchronized (this) {
                while (true) {
                    if (exception != null)
                    if (done)
                        return value;
                    if (delta > waitTimeMs) {
                        throw new TimeoutException();
                    this.wait(waitTimeMs - delta);
                    delta = System.currentTimeMillis() - startMs;

While debugging I observed {{waitTimeMs}} and {{delta}} to become equal after one iteration,
giving a {{this.wait(0)}} in the next iteration, which according to the documentation http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-
results in an indefinite wait.

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