+1 here As a workaround we seek to the current offset which resets the current clients internal states and everything continues.
Regards, Bruno Rassaerts | Freelance Java Developer Novazone, Edingsesteenweg 302, B-1755 Gooik, Belgium T: +32(0)54/26.02.03 - M:+32(0)477/39.01.15 bruno.rassae...@novazone.be -www.novazone.be > On 23 Jan 2016, at 17:52, Ismael Juma <ism...@juma.me.uk> wrote: > > Hi, > > Can you please file an issue in JIRA so that we make sure this is > investigated? > > Ismael > >> On Fri, Jan 22, 2016 at 3:13 PM, Han JU <ju.han.fe...@gmail.com> wrote: >> >> Hi, >> >> I'm prototyping with the new consumer API of kafka 0.9 and I'm particularly >> interested in the `ConsumerRebalanceListener`. >> >> My test setup is like the following: >> - 5M messages pre-loaded in one node kafka 0.9 >> - 12 partitions, auto offset commit set to false >> - in `onPartitionsRevoked`, commit offset and flush the local state >> >> The test run is like the following: >> - launch one process with 2 consumers and let it consume for a while >> - launch another process with 2 consumers, this triggers a rebalancing, >> and let these 2 processes run until messages are all consumed >> >> The code is here: https://gist.github.com/darkjh/fe1e5a5387bf13b4d4dd >> >> So at first, the 2 consumers of the first process each got 6 partitions. >> And after the rebalancing, each consumer got 3 partitions. It's confirmed >> by logging inside the `onPartitionAssigned` callback. >> >> But after the rebalancing, one of the 2 consumers of the first process stop >> receiving messages, even if it has partitions assigned to: >> >> balance-1 pulled 7237 msgs ... >> balance-0 pulled 7263 msgs ... >> 2016-01-22 15:50:37,533 [INFO] [pool-1-thread-2] >> o.a.k.c.c.i.AbstractCoordinator - Attempt to heart beat failed since the >> group is rebalancing, try to re-join group. >> balance-1 flush @ 536637 >> balance-1 committed offset for List(balance-11, balance-10, balance-9, >> balance-8, balance-7, balance-6) >> 2016-01-22 15:50:37,575 [INFO] [pool-1-thread-1] >> o.a.k.c.c.i.AbstractCoordinator - Attempt to heart beat failed since the >> group is rebalancing, try to re-join group. >> balance-0 flush @ 543845 >> balance-0 committed offset for List(balance-5, balance-4, balance-3, >> balance-2, balance-1, balance-0) >> balance-0 got assigned List(balance-5, balance-4, balance-3) >> balance-1 got assigned List(balance-11, balance-10, balance-9) >> balance-1 pulled 3625 msgs ... >> balance-0 pulled 3621 msgs ... >> balance-0 pulled 3631 msgs ... >> balance-0 pulled 3631 msgs ... >> balance-1 pulled 0 msgs ... >> balance-0 pulled 3643 msgs ... >> balance-0 pulled 3643 msgs ... >> balance-1 pulled 0 msgs ... >> balance-0 pulled 3622 msgs ... >> balance-0 pulled 3632 msgs ... >> balance-1 pulled 0 msgs ... >> balance-0 pulled 3637 msgs ... >> balance-0 pulled 3641 msgs ... >> balance-0 pulled 3640 msgs ... >> balance-1 pulled 0 msgs ... >> balance-0 pulled 3632 msgs ... >> balance-0 pulled 3630 msgs ... >> balance-1 pulled 0 msgs ... >> ...... >> >> `balance-0` and `balance-1` are the names of the consumer thread. So after >> the rebalancing, thread `balance-1` continues to poll but no message >> arrive, given that it has got 3 partitions assigned to after the >> rebalancing. >> >> Finally other 3 consumers pulls all their partitions' message, the >> situation is like >> >> GROUP, TOPIC, PARTITION, CURRENT OFFSET, LOG END OFFSET, LAG, OWNER >> balance-test, balance, 9, 417467, 417467, 0, consumer-2_/127.0.0.1 >> balance-test, balance, 10, 417467, 417467, 0, consumer-2_/127.0.0.1 >> balance-test, balance, 11, 417467, 417467, 0, consumer-2_/127.0.0.1 >> balance-test, balance, 6, 180269, 417467, 237198, consumer-2_/127.0.0.1 >> balance-test, balance, 7, 180036, 417468, 237432, consumer-2_/127.0.0.1 >> balance-test, balance, 8, 180197, 417467, 237270, consumer-2_/127.0.0.1 >> balance-test, balance, 3, 417467, 417467, 0, consumer-1_/127.0.0.1 >> balance-test, balance, 4, 417468, 417468, 0, consumer-1_/127.0.0.1 >> balance-test, balance, 5, 417468, 417468, 0, consumer-1_/127.0.0.1 >> balance-test, balance, 0, 417467, 417467, 0, consumer-1_/127.0.0.1 >> balance-test, balance, 1, 417467, 417467, 0, consumer-1_/127.0.0.1 >> balance-test, balance, 2, 417467, 417467, 0, consumer-1_/127.0.0.1 >> >> So you can see, partition [6, 7, 8] still has messages, but the consumer >> can't pull them after the rebalancing. >> >> I've tried 0.9.0.0 release, trunk and 0.9.0 branch, for both server/broker >> and client. >> >> I hope the code is clear enough to illustrate/reproduce the problem. It's >> quite a surprise for me because this is the main feature of the new >> consumer API, but it does not seem to work properly. >> Feel free to talk to me for any details. >> -- >> *JU Han* >> >> Software Engineer @ Teads.tv >> >> +33 0619608888 >>
