How Can we create a topic in Kafka from the IDE using API

In Kafka 0.8.1+ -- the latest version of Kafka as of today -- you can programmatically create a new topic via AdminCommand. The functionality of CreateTopicCommand (part of the older Kafka 0.8.0) that was mentioned in one of the previous answers to this question was moved to AdminCommand.

Scala example for Kafka 0.8.1:

import kafka.admin.AdminUtils
import kafka.utils.ZKStringSerializer
import org.I0Itec.zkclient.ZkClient

// Create a ZooKeeper client
val sessionTimeoutMs = 10000
val connectionTimeoutMs = 10000
// Note: You must initialize the ZkClient with ZKStringSerializer.  If you don't, then
// createTopic() will only seem to work (it will return without error).  The topic will exist in
// only ZooKeeper and will be returned when listing topics, but Kafka itself does not create the
// topic.
val zkClient = new ZkClient("zookeeper1:2181", sessionTimeoutMs, connectionTimeoutMs,
    ZKStringSerializer)

// Create a topic named "myTopic" with 8 partitions and a replication factor of 3
val topicName = "myTopic"
val numPartitions = 8
val replicationFactor = 3
val topicConfig = new Properties
AdminUtils.createTopic(zkClient, topicName, numPartitions, replicationFactor, topicConfig)

Build dependencies, using sbt as example:

libraryDependencies ++= Seq(
  "com.101tec" % "zkclient" % "0.4",
  "org.apache.kafka" % "kafka_2.10" % "0.8.1.1"
    exclude("javax.jms", "jms")
    exclude("com.sun.jdmk", "jmxtools")
    exclude("com.sun.jmx", "jmxri"),
  ...
)

EDIT: Added Java example for Kafka 0.9.0.0 (latest version as of Jan 2016).

Maven dependencies:

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.11</artifactId>
    <version>0.9.0.0</version>
</dependency>
<dependency>
    <groupId>com.101tec</groupId>
    <artifactId>zkclient</artifactId>
    <version>0.7</version>
</dependency>

Code:

import org.I0Itec.zkclient.ZkClient;
import org.I0Itec.zkclient.ZkConnection;

import java.util.Properties;

import kafka.admin.AdminUtils;
import kafka.utils.ZKStringSerializer$;
import kafka.utils.ZkUtils;

public class KafkaJavaExample {

  public static void main(String[] args) {
    String zookeeperConnect = "zkserver1:2181,zkserver2:2181";
    int sessionTimeoutMs = 10 * 1000;
    int connectionTimeoutMs = 8 * 1000;
    // Note: You must initialize the ZkClient with ZKStringSerializer.  If you don't, then
    // createTopic() will only seem to work (it will return without error).  The topic will exist in
    // only ZooKeeper and will be returned when listing topics, but Kafka itself does not create the
    // topic.
    ZkClient zkClient = new ZkClient(
        zookeeperConnect,
        sessionTimeoutMs,
        connectionTimeoutMs,
        ZKStringSerializer$.MODULE$);

    // Security for Kafka was added in Kafka 0.9.0.0
    boolean isSecureKafkaCluster = false;
    ZkUtils zkUtils = new ZkUtils(zkClient, new ZkConnection(zookeeperConnect), isSecureKafkaCluster);

    String topic = "my-topic";
    int partitions = 2;
    int replication = 3;
    Properties topicConfig = new Properties(); // add per-topic configurations settings here
    AdminUtils.createTopic(zkUtils, topic, partitions, replication, topicConfig);
    zkClient.close();
  }

}

EDIT 2: Added Java example for Kafka 0.10.2.0 (latest version as of April 2017).

Maven dependencies:

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.11</artifactId>
    <version>0.10.2.0</version>
</dependency>
<dependency>
    <groupId>com.101tec</groupId>
    <artifactId>zkclient</artifactId>
    <version>0.9</version>
</dependency>

Code:

import org.I0Itec.zkclient.ZkClient;
import org.I0Itec.zkclient.ZkConnection;

import java.util.Properties;

import kafka.admin.AdminUtils;
import kafka.admin.RackAwareMode;
import kafka.utils.ZKStringSerializer$;
import kafka.utils.ZkUtils;

public class KafkaJavaExample {

  public static void main(String[] args) {
    String zookeeperConnect = "zkserver1:2181,zkserver2:2181";
    int sessionTimeoutMs = 10 * 1000;
    int connectionTimeoutMs = 8 * 1000;

    String topic = "my-topic";
    int partitions = 2;
    int replication = 3;
    Properties topicConfig = new Properties(); // add per-topic configurations settings here

    // Note: You must initialize the ZkClient with ZKStringSerializer.  If you don't, then
    // createTopic() will only seem to work (it will return without error).  The topic will exist in
    // only ZooKeeper and will be returned when listing topics, but Kafka itself does not create the
    // topic.
    ZkClient zkClient = new ZkClient(
        zookeeperConnect,
        sessionTimeoutMs,
        connectionTimeoutMs,
        ZKStringSerializer$.MODULE$);

    // Security for Kafka was added in Kafka 0.9.0.0
    boolean isSecureKafkaCluster = false;

    ZkUtils zkUtils = new ZkUtils(zkClient, new ZkConnection(zookeeperConnect), isSecureKafkaCluster);
    AdminUtils.createTopic(zkUtils, topic, partitions, replication, topicConfig, RackAwareMode.Enforced$.MODULE$);
    zkClient.close();
  }

}

As of 0.11.0.0 all you need is:

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>0.11.0.0</version>
</dependency>

This artifact now contains the AdminClient (org.apache.kafka.clients.admin).

AdminClient can handle many Kafka admin tasks, including topic creation:

Properties config = new Properties();
config.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka:9092");

AdminClient admin = AdminClient.create(config);

Map<String, String> configs = new HashMap<>();
int partitions = 1;
int replication = 1;

admin.createTopics(asList(new NewTopic("topic", partitions, replication).configs(configs)));

The output of this command is a CreateTopicsResult, which you can use to get a Future for the whole operation or for each individual topic creation:

to get a future for the whole operation, use CreateTopicsResult#all().
to get Futures for all the topics individually, use CreateTopicsResult#values().

For example:

CreateTopicsResult result = ...
KafkaFuture<Void> all = result.all();

or:

CreateTopicsResult result = ...
for (Map.Entry<String, KafkaFuture<Void>> entry : result.values().entrySet()) {
    try {
        entry.getValue().get();
        log.info("topic {} created", entry.getKey());
    } catch (InterruptedException | ExecutionException e) {
        if (Throwables.getRootCause(e) instanceof TopicExistsException) {
            log.info("topic {} existed", entry.getKey());
        }
    }
}

KafkaFuture is "a flexible future which supports call chaining and other asynchronous programming patterns," and "will eventually become a thin shim on top of Java 8's CompletebleFuture."

For creating a topic through java api and Kafka 0.8+ try the following,

First import below statement

import kafka.utils.ZKStringSerializer$;

Create object for ZkClient in the following way,

ZkClient zkClient = new ZkClient("localhost:2181", 10000, 10000, ZKStringSerializer$.MODULE$);
AdminUtils.createTopic(zkClient, myTopic, 10, 1, new Properties());

You can try with kafka.admin.CreateTopicCommand scala class to create Topic from Java code...providng the necessary arguments.

String [] arguments = new String[8];
arguments[0] = "--zookeeper";
arguments[1] = "10.***.***.***:2181";
arguments[2] = "--replica";
arguments[3] = "1";
arguments[4] = "--partition";
arguments[5] = "1";
arguments[6] = "--topic";
arguments[7] = "test-topic-Biks";

CreateTopicCommand.main(arguments);

NB: You should add the maven dependencies for jopt-simple-4.5 & zkclient-0.1

Based on the latest kafka-client api and Kafka 2.1.1, the working version of code follows:

Import the latest kafka-clients using sbt.

// https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients
libraryDependencies += Seq("org.apache.kafka" % "kafka-clients" % "2.1.1",
"org.apache.kafka" %% "kafka" % "2.1.1")

The code for topic creation in scala:

import java.util.Arrays
import java.util.Properties

import org.apache.kafka.clients.admin.NewTopic
import org.apache.kafka.clients.admin.{AdminClient, AdminClientConfig}

class CreateKafkaTopic {
  def create(): Unit = {
    val config = new Properties()
    config.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "192.30.1.5:9092")

    val localKafkaAdmin = AdminClient.create(config)

    val partitions = 3
    val replication = 1.toShort
    val topic = new NewTopic("integration-02", partitions, replication)
    val topics = Arrays.asList(topic)

    val topicStatus = localKafkaAdmin.createTopics(topics).values()
    //topicStatus.values()
    println(topicStatus.keySet())
  }

}

Validate the new topic using:

./kafka-topics.sh --zookeeper 192.30.1.5:2181 --list

Hope it is helpful to someone. Reference: http://kafka.apache.org/21/javadoc/index.html?org/apache/kafka/clients/admin/AdminClient.html

How Can we create a topic in Kafka from the IDE using API

Related

Recent Posts