Trident executes a batch every 500ms (by default). A batch involves a bunch of coordination messages going out to all the bolts to coordinate the batch (even if the batch is empty). So that's what you're seeing.
On Fri, Sep 26, 2014 at 12:32 PM, Deepak Subhramanian < deepak.subhraman...@gmail.com> wrote: > Hi, > I deployed a basic trident topology in HDP storm cluster. I am using > > TransactionalTridentKafkaSpout to process messages from Kafka Queue . For > some reason the ack count in Storm GUI in spout and bolt increases by 20 > every second even if there is no messages in Kafka queue . > > Is there any reason ack is called by Trident even though no messages are > getting processed > Thanks, D > > > -- Twitter: @nathanmarz http://nathanmarz.com
