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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