In my testing i got this simple source->map->sink working,
Source<CommittableMessage<SpecificRecord, SpecificRecord>, Control> s = Consumer.committableSource(consumerSettings, Subscriptions.topics("sanitation")).asJava(); s.map(new Function<ConsumerMessage.CommittableMessage<SpecificRecord,SpecificRecord>, ProducerMessage.Message<SpecificRecord,SpecificRecord, ConsumerMessage.Committable>>() { public Message<SpecificRecord, SpecificRecord, Committable> apply( CommittableMessage<SpecificRecord, SpecificRecord> msg) throws Exception { System.out.println(Thread.currentThread().getName()"msg----------------" + msg); return new ProducerMessage.Message<SpecificRecord, SpecificRecord, ConsumerMessage.Committable>( new ProducerRecord<SpecificRecord, SpecificRecord>("akkatest", msg.record().key(), msg.record().value()), msg.committableOffset()); } }).runWith(Producer.commitableSink(producerSettings), materializer); now i want to test parallel by partition, i dont know what to put in the CompletionStage, can someone help or point me some doc/examples? TopicPartition par = new TopicPartition("test", 3); Source<Tuple2<TopicPartition, akka.stream.scaladsl.Source<CommittableMessage<SpecificRecord, SpecificRecord>, NotUsed>>, Control> s = Consumer.committablePartitionedSource(consumerSettings, Subscriptions.topics("test")).asJava(); s.mapAsync(3, new Function<Tuple2<TopicPartition,Source<CommittableMessage<SpecificRecord,SpecificRecord>,NotUsed>>, CompletionStage<ProducerMessage.Message<SpecificRecord,SpecificRecord, ConsumerMessage.Committable>>>() { public CompletionStage<Message<SpecificRecord, SpecificRecord, Committable>> apply( Tuple2<TopicPartition, Source<CommittableMessage<SpecificRecord, SpecificRecord>, NotUsed>> param) throws Exception { // TODO Auto-generated method stub return null; } }); Thanks Shannon -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to akka-user+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at https://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.