Assigning consumers to a topic partition

Kafka clients allows you to implement your own partition assignment strategies for consumers.

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If you have a topic with multiple consumers and want to assign a consumer to a specific partition topic, you can use the assignPartitions method, available on the ConsumerBuilder instance:

$partition = 1; // The partition number you want to assign

$consumer = \Junges\Kafka\Facades\Kafka::consumer()
    ->assignPartitions([
        new \RdKafka\TopicPartition('your-topic-name', $partition)
    ]);

The assignPartitions method accepts an array of \RdKafka\TopicPartition objects. You can assign multiple partitions to the same consumer by adding more entries to the assignPartitions parameter:

$consumer = \Junges\Kafka\Facades\Kafka::consumer()
    ->assignPartitions([
        new \RdKafka\TopicPartition('your-topic-name', 1),
        new \RdKafka\TopicPartition('your-topic-name', 2),
        new \RdKafka\TopicPartition('your-topic-name', 3)
    ]);

If you don't know the partition numbers in advance (which is common when using consumer groups), you can use the partition discovery features:

$consumer = \Junges\Kafka\Facades\Kafka::consumer(['your-topic-name'], 'your-group')
    ->withPartitionAssignmentCallback(function ($partitions) {
        echo "Assigned " . count($partitions) . " partitions\n";
        
        foreach ($partitions as $partition) {
            echo "Partition: {$partition->getPartition()}\n";
        }
    })
    ->withHandler(function ($message) {
        // Handle message
    });

For more advanced partition discovery and dynamic offset assignment, see the Partition Discovery documentation .

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