presto-kafka/src/main/java/io/prestosql/plugin/kafka/KafkaConnectorConfig.java/KafkaConnectorConfig/parseNodes
class KafkaConnectorConfig:    public static ImmutableSet<HostAddress> parseNodes(String nodes)
    {
        Splitter splitter = Splitter.on(',').omitEmptyStrings().trimResults();
        return StreamSupport.stream(splitter.split(nodes).spliterator(), false)
                .map(KafkaConnectorConfig::toHostAddress)
                .collect(toImmutableSet());
    }