The commit commands are emitted to the underlying KafkaConsumer in right order. It is waiting for the results of the commits that are done in parallel, and will possibly increase total throughput. We observed better throughput in performance tests.
It would be great to clarify this in docs. You are not the first one to ask. Would you like to open a pull request? /Patrik lör 27 aug. 2016 kl. 00:35 skrev Drew Kutcharian <d...@venarc.com>: > Hi, > > In the "Offset Storage in Kafka” on > http://doc.akka.io/docs/akka-stream-kafka/current/consumer.html#offset-storage-in-kafka > there > is the following example: > > .groupedWithin(10, 5.seconds) > .map(group => group.foldLeft(CommittableOffsetBatch.empty) { (batch, elem) > => batch.updated(elem) }) > .mapAsync(3)(_.commitScaladsl()) > > Wouldn’t the ".mapAsync(3)(_.commitScaladsl())” cause the offsets to be > committed to Kafka out of order? Shouldn’t it be "mapAsync(1)”? > > Best, > > Drew > > -- > >>>>>>>>>> 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. > -- >>>>>>>>>> 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.
