public KafkaSink ensureReady() {
		KafkaUtils.ensureReady(this.toString(), this.zkConnect, this.topic);
		return this;
	}
Ensure that the kafka broker socket is available by polling it for up to 2 seconds

@return instance of the KafkaSink
@throws IllegalStateException if can not connect in 2 seconds.
spring-xd-test-fixtures/src/main/java/org/springframework/xd/test/fixtures/KafkaSink.java