TopicCommand.alterTopic in Kakfa 2.4 - apache-kafka

Question

I have an old project (it's not mine) and I'm trying to update it from Kafka 2.1 to 2.4.
I have the following piece of code
public synchronized void increasePartitions(String topic, int partitions) throws InvalidPartitionsException, IllegalArgumentException {
StringBuilder commandString = new StringBuilder();
commandString.append("--alter");
commandString.append(" --topic ").append(topic);
commandString.append(" --zookeeper ").append(config.getOrDefault("zookeeper.connect",
"localhost:2181"));
commandString.append(" --partitions ").append(partitions);
String[] command = commandString.toString().split(" ");
TopicCommand.alterTopic(kafkaZkClient, new TopicCommand.TopicCommandOptions(command));
}
It says that the alterTopic method of TopicCommand doesn't exist. I'm looking at the documentation and I don't know how to solve it.
I need this method to do the exact same thing but with Kafka version 2.4.

Answer 1

You should use the Admin API to perform tasks like this.
In order to add partitions, there's the createPartitions() method.
For example, to increase the number of partitions for my-topic to 10:
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
Admin admin = Admin.create(props);
Map<String, NewPartitions> newPartitions = new HashMap<>();
newPartitions.put("my-topic", NewPartitions.increaseTo(10));
CreatePartitionsResult createPartitions = admin.createPartitions(newPartitions);
createPartitions.all().get();