kafka configuration + zookeeper cli + get the right info for kafka host - linux

Question

As all know when is need to print the kafka broker id’s we can use the following cli
zookeeper-shell.sh zoo_server1:2181 <<< "ls /brokers/ids"
this cli print the following
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[1018, 1017, 1016]
Its means that we have kafka with id’s
1018
1017
1016
But our kafka names are
Kafka_confluent01
Kafka_confluent02
Kafka_confluent03
So how to know which kafka broker id ( 1018 , 1017 , 1016 ) is belong to the real host ( Kafka_confluent01 / Kafka_confluent02 / Kafka_confluent03 )

Answer 1

You can use kafkacat for this with the -L operator:
$ kafkacat -b kafka-01.foo.bar:9092 -L
Metadata for all topics (from broker 1: kafka-01.foo.bar:9092/1):
3 brokers:
broker 2 at kafka-02.foo.bar:9092
broker 3 at kafka-03.foo.bar:9092
broker 1 at kafka-01.foo.bar:9092 (controller)

Answer 2

You can get the list of brokers dynamically, using the following code.
public class KafkaBrokerInfoFetcher {
public static void main(String[] args) throws Exception {
ZooKeeper zk = new ZooKeeper("localhost:2181", 10000, null);
List<String> ids = zk.getChildren("/brokers/ids", false);
for (String id : ids) {
String brokerInfo = new String(zk.getData("/brokers/ids/" + id, false, null));
System.out.println(id + ": " + brokerInfo);
}
}
}
After running the code, you will get the broker id and corresponding host.
1: {"jmx_port":-1,"timestamp":"1428512949385","host":"192.168.0.11","version":1,"port":9093}
2: {"jmx_port":-1,"timestamp":"1428512955512","host":"192.168.0.11","version":1,"port":9094}
3: {"jmx_port":-1,"timestamp":"1428512961043","host":"192.168.0.11","version":1,"port":9095}