About to verify hypothesis on monday, but looks like that in latest tests. Need to double check.
On Fri, Oct 6, 2017 at 11:25 PM, Stas Chizhov <schiz...@gmail.com> wrote: > So no matter in what sequence you shutdown brokers it is only 1 that causes > the major problem? That would indeed be a bit weird. have you checked > offsets of your consumer - right after offsets jump back - does it start > from the topic start or does it go back to some random position? Have you > checked if all offsets are actually being committed by consumers? > > fre 6 okt. 2017 kl. 20:59 skrev Dmitriy Vsekhvalnov < > dvsekhval...@gmail.com > >: > > > Yeah, probably we can dig around. > > > > One more observation, the most lag/re-consumption trouble happening when > we > > kill broker with lowest id (e.g. 100 from [100,101,102]). > > When crashing other brokers - there is nothing special happening, lag > > growing little bit but nothing crazy (e.g. thousands, not millions). > > > > Is it sounds suspicious? > > > > On Fri, Oct 6, 2017 at 9:23 PM, Stas Chizhov <schiz...@gmail.com> wrote: > > > > > Ted: when choosing earliest/latest you are saying: if it happens that > > there > > > is no "valid" offset committed for a consumer (for whatever reason: > > > bug/misconfiguration/no luck) it will be ok to start from the beginning > > or > > > end of the topic. So if you are not ok with that you should choose > none. > > > > > > Dmitriy: Ok. Then it is spring-kafka that maintains this offset per > > > partition state for you. it might also has that problem of leaving > stale > > > offsets lying around, After quickly looking through > > > https://github.com/spring-projects/spring-kafka/blob/ > > > 1945f29d5518e3c4a9950ba82135420dfb61e808/spring-kafka/src/ > > > main/java/org/springframework/kafka/listener/ > > > KafkaMessageListenerContainer.java > > > it looks possible since offsets map is not cleared upon partition > > > revocation, but that is just a hypothesis. I have no experience with > > > spring-kafka. However since you say you consumers were always active I > > find > > > this theory worth investigating. > > > > > > > > > 2017-10-06 18:20 GMT+02:00 Vincent Dautremont < > > > vincent.dautrem...@olamobile.com.invalid>: > > > > > > > is there a way to read messages on a topic partition from a specific > > node > > > > we that we choose (and not by the topic partition leader) ? > > > > I would like to read myself that each of the __consumer_offsets > > partition > > > > replicas have the same consumer group offset written in it in it. > > > > > > > > On Fri, Oct 6, 2017 at 6:08 PM, Dmitriy Vsekhvalnov < > > > > dvsekhval...@gmail.com> > > > > wrote: > > > > > > > > > Stas: > > > > > > > > > > we rely on spring-kafka, it commits offsets "manually" for us > after > > > > event > > > > > handler completed. So it's kind of automatic once there is constant > > > > stream > > > > > of events (no idle time, which is true for us). Though it's not > what > > > pure > > > > > kafka-client calls "automatic" (flush commits at fixed intervals). > > > > > > > > > > On Fri, Oct 6, 2017 at 7:04 PM, Stas Chizhov <schiz...@gmail.com> > > > wrote: > > > > > > > > > > > You don't have autocmmit enables that means you commit offsets > > > > yourself - > > > > > > correct? If you store them per partition somewhere and fail to > > clean > > > it > > > > > up > > > > > > upon rebalance next time the consumer gets this partition > assigned > > > > during > > > > > > next rebalance it can commit old stale offset- can this be the > > case? > > > > > > > > > > > > > > > > > > fre 6 okt. 2017 kl. 17:59 skrev Dmitriy Vsekhvalnov < > > > > > > dvsekhval...@gmail.com > > > > > > >: > > > > > > > > > > > > > Reprocessing same events again - is fine for us (idempotent). > > While > > > > > > loosing > > > > > > > data is more critical. > > > > > > > > > > > > > > What are reasons of such behaviour? Consumers are never idle, > > > always > > > > > > > commiting, probably something wrong with broker setup then? > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 6:58 PM, Ted Yu <yuzhih...@gmail.com> > > > wrote: > > > > > > > > > > > > > > > Stas: > > > > > > > > bq. using anything but none is not really an option > > > > > > > > > > > > > > > > If you have time, can you explain a bit more ? > > > > > > > > > > > > > > > > Thanks > > > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 8:55 AM, Stas Chizhov < > > schiz...@gmail.com > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > If you set auto.offset.reset to none next time it happens > you > > > > will > > > > > be > > > > > > > in > > > > > > > > > much better position to find out what happens. Also in > > general > > > > with > > > > > > > > current > > > > > > > > > semantics of offset reset policy IMO using anything but > none > > is > > > > not > > > > > > > > really > > > > > > > > > an option unless it is ok for consumer to loose some data > > > > (latest) > > > > > or > > > > > > > > > reprocess it second time (earliest). > > > > > > > > > > > > > > > > > > fre 6 okt. 2017 kl. 17:44 skrev Ted Yu < > yuzhih...@gmail.com > > >: > > > > > > > > > > > > > > > > > > > Should Kafka log warning if log.retention.hours is lower > > than > > > > > > number > > > > > > > of > > > > > > > > > > hours specified by offsets.retention.minutes ? > > > > > > > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 8:35 AM, Manikumar < > > > > > > manikumar.re...@gmail.com > > > > > > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > normally, log.retention.hours (168hrs) should be > higher > > > than > > > > > > > > > > > offsets.retention.minutes (336 hrs)? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 8:58 PM, Dmitriy Vsekhvalnov < > > > > > > > > > > > dvsekhval...@gmail.com> > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > Hi Ted, > > > > > > > > > > > > > > > > > > > > > > > > Broker: v0.11.0.0 > > > > > > > > > > > > > > > > > > > > > > > > Consumer: > > > > > > > > > > > > kafka-clients v0.11.0.0 > > > > > > > > > > > > auto.offset.reset = earliest > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 6:24 PM, Ted Yu < > > > > yuzhih...@gmail.com> > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > > > What's the value for auto.offset.reset ? > > > > > > > > > > > > > > > > > > > > > > > > > > Which release are you using ? > > > > > > > > > > > > > > > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > > > > > > > > > > > > > On Fri, Oct 6, 2017 at 7:52 AM, Dmitriy > Vsekhvalnov < > > > > > > > > > > > > > dvsekhval...@gmail.com> > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > Hi all, > > > > > > > > > > > > > > > > > > > > > > > > > > > > we several time faced situation where > > consumer-group > > > > > > started > > > > > > > to > > > > > > > > > > > > > re-consume > > > > > > > > > > > > > > old events from beginning. Here is scenario: > > > > > > > > > > > > > > > > > > > > > > > > > > > > 1. x3 broker kafka cluster on top of x3 node > > > zookeeper > > > > > > > > > > > > > > 2. RF=3 for all topics > > > > > > > > > > > > > > 3. log.retention.hours=168 and > > > > > > > offsets.retention.minutes=20160 > > > > > > > > > > > > > > 4. running sustainable load (pushing events) > > > > > > > > > > > > > > 5. doing disaster testing by randomly shutting > > down 1 > > > > of > > > > > 3 > > > > > > > > broker > > > > > > > > > > > nodes > > > > > > > > > > > > > > (then provision new broker back) > > > > > > > > > > > > > > > > > > > > > > > > > > > > Several times after bouncing broker we faced > > > situation > > > > > > where > > > > > > > > > > consumer > > > > > > > > > > > > > group > > > > > > > > > > > > > > started to re-consume old events. > > > > > > > > > > > > > > > > > > > > > > > > > > > > consumer group: > > > > > > > > > > > > > > > > > > > > > > > > > > > > 1. enable.auto.commit = false > > > > > > > > > > > > > > 2. tried graceful group shutdown, kill -9 and > > > > terminating > > > > > > AWS > > > > > > > > > nodes > > > > > > > > > > > > > > 3. never experienced re-consumption for given > > cases. > > > > > > > > > > > > > > > > > > > > > > > > > > > > What can cause that old events re-consumption? Is > > it > > > > > > related > > > > > > > to > > > > > > > > > > > > bouncing > > > > > > > > > > > > > > one of brokers? What to search in a logs? Any > > broker > > > > > > settings > > > > > > > > to > > > > > > > > > > try? > > > > > > > > > > > > > > > > > > > > > > > > > > > > Thanks in advance. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > The information transmitted is intended only for the person or entity > > to > > > > which it is addressed and may contain confidential and/or privileged > > > > material. Any review, retransmission, dissemination or other use of, > or > > > > taking of any action in reliance upon, this information by persons or > > > > entities other than the intended recipient is prohibited. If you > > received > > > > this in error, please contact the sender and delete the material from > > any > > > > computer. > > > > > > > > > >
