Hi, the `map` when it is followed by `groupByKey` will cause a repartitioning of the data, so you will have your 5 tasks processing the input partitions and 5 tasks processing the partitions from the repartitioning.
On Tue, 31 Oct 2017 at 10:56 pravin kumar <pk007...@gmail.com> wrote: > I have created a stream with topic contains 5 partitions and expected to > create 5 stream tasks ,i got 10 tasks as > 0_0 0_1 0_2 0_3 0_4 1_0 1_1 1_2 1_3 1_4 > > > im doing wordcount in this example, > > here is my topology in this link: 1. > https://gist.github.com/Pk007790/72b0718f26e6963246e83da992b3e725 > 2.https://gist.github.com/Pk007790/a05226007ca90cdd36c362d09d19bda6. > > On Tue, Oct 24, 2017 at 3:29 PM, Damian Guy <damian....@gmail.com> wrote: > > > It would depend on what your topology looks like, which you haven't show > > here. But if there may be internal topics generated due to repartitioning > > which would cause the extra tasks. > > If you provide the topology we would be able to tell you. > > Thanks, > > Damian > > > > On Tue, 24 Oct 2017 at 10:14 pravin kumar <pk007...@gmail.com> wrote: > > > > > I have created a stream with topic contains 5 partitions and expected > to > > > create 5 stream tasks ,i got 10 tasks as > > > 0_0 0_1 0_2 0_3 0_4 1_0 1_1 1_2 1_3 1_4 > > > > > > > > > my doubt is:im expected to have 5 tasks how it produced 10 tasks > > > > > > here are some logs: > > > [2017-10-24 10:27:35,284] INFO Kafka commitId : > > > cb8625948210849f (org.apache.kafka.common.utils.AppInfoParser) > > > [2017-10-24 10:27:35,284] DEBUG Kafka consumer created > > > (org.apache.kafka.clients.consumer.KafkaConsumer) > > > [2017-10-24 10:27:35,304] INFO stream-thread > > > > > > [SingleConsumerMultiConsumerUsingStreamx4-4dc5b303-62b4-4898- > > 9d8f-a1a9a8adfb7d-StreamThread-1] > > > State transition from CREATED to RUNNING. > > > (org.apache.kafka.streams.processor.internals.StreamThread) > > > [2017-10-24 10:27:35,306] DEBUG stream-client > > > > > > [SingleConsumerMultiConsumerUsingStreamx4-4dc5b303-62b4-4898- > > 9d8f-a1a9a8adfb7d] > > > Removing local Kafka Streams application data in > > > > > > /home/admin/Documents/kafka_2.11-0.10.2.1/kafka-streams/ > > SingleConsumerMultiConsumerUsingStreamx4 > > > for application SingleConsumerMultiConsumerUsingStreamx4. > > > (org.apache.kafka.streams.KafkaStreams) > > > [2017-10-24 10:27:35,311] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 0_0 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,311] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 0_0 for task 0_0 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,322] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 0_0 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,322] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 1_0 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,322] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 1_0 for task 1_0 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 1_0 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 0_1 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 0_1 for task 0_1 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 0_1 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 1_1 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,395] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 1_1 for task 1_1 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,396] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 1_1 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,396] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 0_2 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,396] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 0_2 for task 0_2 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,397] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 0_2 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,397] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 1_2 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,397] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 1_2 for task 1_2 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,398] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 1_2 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,398] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 0_3 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,398] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 0_3 for task 0_3 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,398] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 0_3 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,398] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 1_3 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,399] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 1_3 for task 1_3 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,399] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 1_3 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,400] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 0_4 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,400] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 0_4 for task 0_4 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,400] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 0_4 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,400] DEBUG stream-thread [cleanup] Acquired state > > dir > > > lock for task 1_4 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,400] INFO stream-thread [cleanup] Deleting > obsolete > > > state directory 1_4 for task 1_4 as cleanup delay of 0 ms has passed > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,401] DEBUG stream-thread [cleanup] Released state > > dir > > > lock for task 1_4 > > > (org.apache.kafka.streams.processor.internals.StateDirectory) > > > [2017-10-24 10:27:35,401] DEBUG stream-client > > > > > > [SingleConsumerMultiConsumerUsingStreamx4-4dc5b303-62b4-4898- > > 9d8f-a1a9a8adfb7d] > > > Starting Kafka Stream process. (org.apache.kafka.streams.KafkaStreams) > > > [2017-10-24 10:27:35,413] DEBUG Updated cluster metadata version 1 to > > > Cluster(id = null, nodes = [localhost:9092 (id: -1 rack: null)], > > partitions > > > = []) (org.apache.kafka.clients.Metadata) > > > > > >
