检查系统是否连接到Kafka

Question

I need to write a smoke test in Java which validates whether the system is connected to kafka,

Does anyone have any idea? I have found this post:

How to check whether Kafka Server is running?

But it's too complicated to do from a Java code and I don't think It's the direction i should use.

Thanks in advance.

Answer 1

I had the same question and I don't want to leave this question without any answer. I read a lot about how I can check the connection and most of the answers I found was checking the connection with Zk, but I really want to check the connection directly with Kafka server.

What I did is to create a simple KafkaConsumer and list all the topics with listTopics() . If the connection is success, then you will get something as a return. Otherwise, you will get a TimeoutException .

  def validateKafkaConnection(kafkaParams : mutable.Map[String, Object]) : Unit = {
    val props = new Properties()
    props.put("bootstrap.servers", kafkaParams.get("bootstrap.servers").get.toString)
    props.put("group.id", kafkaParams.get("group.id").get.toString)
    props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")
    props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")
    val simpleConsumer = new KafkaConsumer[String, String](props)
    simpleConsumer.listTopics()
  }

then you can wrap this method in a try-catch sentence to catch the exception.

Answer 2

You can check if the server is running by using this:

ZkClient zkClient = new ZkClient("your_zookeeper_server", 5000 /* ZOOKEEPER_SESSION_TIMEOUT */, 5000 /* ZOOKEEPER_CONNECTION_TIMEOUT */, ZKStringSerializer$.MODULE$);
List<Broker> brokers = scala.collection.JavaConversions.seqAsJavaList(zkUtils.getAllBrokersInCluster());
if (brokers.isEmpty()) {
    // No brokers available
} else {
    // There are brokers available
}