Hi Victor, Thanks for reviewing the KIP.
Yes, to minimize the backward compatibility impact, there would be no harm in letting a stand-alone consumer consume messages under a "" group id (as long as there is no offset commit). It would have to knowingly seek to an offset or rely on the auto.offset.reset config for the starting offset. This way the existing functionality would be preserved for the most part (with the argument that using the default group id for offset commit should not be the user's intention in practice). Does it seem reasonable? Thanks. --Vahid From: Viktor Somogyi <viktorsomo...@gmail.com> To: dev <dev@kafka.apache.org> Date: 05/25/2018 04:56 AM Subject: Re: [DISCUSS] KIP-289: Improve the default group id behavior in KafkaConsumer Hi Vahid, When reading your KIP I coldn't fully understand why did you decide at failing with "offset_commit" in case #2? Can't we fail with an empty group id even in "fetch" or "fetch_offset"? What was the reason for deciding to fail at "offset_commit"? Was it because of upgrade compatibility reasons? Thanks, Viktor On Thu, May 24, 2018 at 12:06 AM, Ted Yu <yuzhih...@gmail.com> wrote: > Looks good to me. > -------- Original message --------From: Vahid S Hashemian < > vahidhashem...@us.ibm.com> Date: 5/23/18 11:19 AM (GMT-08:00) To: > dev@kafka.apache.org Subject: Re: [DISCUSS] KIP-289: Improve the default > group id behavior in KafkaConsumer > Hi Ted, > > Thanks for reviewing the KIP. I updated the KIP and introduced an error > code for the scenario described. > > --Vahid > > > > > From: Ted Yu <yuzhih...@gmail.com> > To: dev@kafka.apache.org > Date: 04/27/2018 04:31 PM > Subject: Re: [DISCUSS] KIP-289: Improve the default group id > behavior in KafkaConsumer > > > > bq. If they attempt an offset commit they will receive an error. > > Can you outline what specific error would be encountered ? > > Thanks > > On Fri, Apr 27, 2018 at 2:17 PM, Vahid S Hashemian < > vahidhashem...@us.ibm.com> wrote: > > > Hi all, > > > > I have drafted a proposal for improving the behavior of KafkaConsumer > when > > using the default group id: > > > https://cwiki.apache.org/confluence/display/KAFKA/KIP- > > > 289%3A+Improve+the+default+group+id+behavior+in+KafkaConsumer > > The proposal based on the issue and suggestion reported in KAFKA-6774. > > > > Your feedback is welcome! > > > > Thanks. > > --Vahid > > > > > > > > >
