[jira] [Created] (KAFKA-2657) Kafka clients fail to start if one of broker isn't resolved by DNS

["Alexander Pakulov (JIRA)" <ji...@apache.org>]

Alexander Pakulov created KAFKA-2657:
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             Summary: Kafka clients fail to start if one of broker isn't resolved by DNS 
                 Key: KAFKA-2657
                 URL: https://issues.apache.org/jira/browse/KAFKA-2657
             Project: Kafka
          Issue Type: Bug
            Reporter: Alexander Pakulov
            Priority: Minor


During org.apache.kafka.clients.producer.KafkaProducer and org.apache.kafka.clients.consumer.KafkaConsumer object creation constructors invoke org.apache.kafka.common.utils.ClientUtils#parseAndValidateAddresses
which potentially could throw an exception if one the nodes hasn't been resolved by DNS. As a result of that - object hasn't been created and you aren't able to use Kafka clients.

I personally think that Kafka should be able to operate with cluster with quorum number of instances.

```java
try {
    InetSocketAddress address = new InetSocketAddress(host, port);
    if (address.isUnresolved())
        throw new ConfigException("DNS resolution failed for url in " + ProducerConfig.BOOTSTRAP_SERVERS_CONFIG + ": " + url);
    addresses.add(address);
} catch (NumberFormatException e) {
    throw new ConfigException("Invalid port in " + ProducerConfig.BOOTSTRAP_SERVERS_CONFIG + ": " + url);
}
```



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