vertx / io.vertx.kafka.client.consumer / KafkaReadStream / assign

# assign

`abstract fun assign(partitions: MutableSet<TopicPartition>): KafkaReadStream<K, V>`

Manually assign a set of partitions to this consumer.

### Parameters

`partitions` - partitions which want assigned

Return
current KafkaReadStream instance

`abstract fun assign(partitions: MutableSet<TopicPartition>, completionHandler: Handler<AsyncResult<Void>>): KafkaReadStream<K, V>`

Manually assign a set of partitions to this consumer.

Due to internal buffering of messages, when reassigning the old set of partitions may remain in effect (as observed by the #handler(Handler) record handler)} until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `#batchHandler(Handler)` will only see messages consistent with the new set of partitions.

### Parameters

`partitions` - partitions which want assigned

`completionHandler` - handler called on operation completed

Return
current KafkaReadStream instance