[jira] [Created] (KAFKA-4765) org.apache.kafka.clients.producer.KafkaProducerTest#testConstructorFailureCloseResource and Similar Tests are Failing on some Systems (127.0.53.53 Collision Warning)

["Armin Braun (JIRA)" <ji...@apache.org>]

Armin Braun created KAFKA-4765:
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             Summary: org.apache.kafka.clients.producer.KafkaProducerTest#testConstructorFailureCloseResource and Similar Tests are Failing on some Systems (127.0.53.53 Collision Warning)
                 Key: KAFKA-4765
                 URL: https://issues.apache.org/jira/browse/KAFKA-4765
             Project: Kafka
          Issue Type: Bug
          Components: unit tests
    Affects Versions: 0.10.1.1
         Environment: All DNS environments that properly forward 127.0.53.53
            Reporter: Armin Braun
            Priority: Critical


The test

{code}
org.apache.kafka.clients.producer.KafkaProducerTest#testConstructorFailureCloseResource
{code}

fails on some systems because this below snippet from 
{code}
org.apache.kafka.clients.ClientUtils#parseAndValidateAddresses
{code}

{code}
                    InetSocketAddress address = new InetSocketAddress(host, port);

                    if (address.isUnresolved()) {
                        log.warn("Removing server {} from {} as DNS resolution failed for {}", url, CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, host);
                    } else {
                        addresses.add(address);
                    }
{code}

will add the address *some.invalid.hostname.foo.bar* to the addresses list without error since it is resolved to *127.0.53.53* to indicate potential future collision of the _.bar_ tld.
The same issue applies to a few other test cases that try to intentionally run into broken hostnames.

This can (and should) be fixed by using broken hostname examples that do not collide. I would suggest just putting a ".local" suffix on all that are currently affected by this.



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