vertx / io.vertx.rxjava.kafka.client.consumer / KafkaConsumer / seekToBeginning

# seekToBeginning

`open fun seekToBeginning(topicPartition: TopicPartition): KafkaConsumer<K, V>`

Seek to the first offset for each of the given partition.

### Parameters

`topicPartition` - topic partition for which seek

Return
current KafkaConsumer instance

`open fun seekToBeginning(topicPartitions: MutableSet<TopicPartition>): KafkaConsumer<K, V>`

Seek to the first offset for each of the given partitions.

### Parameters

`topicPartitions` - topic partition for which seek

Return
current KafkaConsumer instance

`open fun seekToBeginning(topicPartition: TopicPartition, completionHandler: Handler<AsyncResult<Void>>): KafkaConsumer<K, V>`

Seek to the first offset for each of the given partition.

Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `io.vertx.rxjava.kafka.client.consumer.KafkaConsumer#batchHandler` will only see messages consistent with the new offset.

### Parameters

`topicPartition` - topic partition for which seek

`completionHandler` - handler called on operation completed

Return
current KafkaConsumer instance

`open fun seekToBeginning(topicPartitions: MutableSet<TopicPartition>, completionHandler: Handler<AsyncResult<Void>>): KafkaConsumer<K, V>`

Seek to the first offset for each of the given partitions.

Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `io.vertx.rxjava.kafka.client.consumer.KafkaConsumer#batchHandler` will only see messages consistent with the new offset.

### Parameters

`topicPartitions` - topic partition for which seek

`completionHandler` - handler called on operation completed

Return
current KafkaConsumer instance