There is no particular need for storing the offsets in zookeeper. In fact with Kafka 0.8, since partitions will be highly available, offsets could be stored in Kafka topics. However, we haven't ironed out the design for this yet.
Thanks, Neha On Fri, May 17, 2013 at 2:19 PM, Scott Clasen <sc...@heroku.com> wrote: > afaik you dont 'have' to store the consumed offsets in zk right, this is > only automatic with some of the clients? > > why not store them in a data store that can write at the rate that you > require? > > > On Fri, May 17, 2013 at 2:15 PM, Withers, Robert <robert.with...@dish.com > >wrote: > > > Update from our OPS team, regarding zookeeper 3.4.x. Given stability, > > adoption of offset batching would be the only remaining bit of work to > do. > > Still, I totally understand the restraint for 0.8... > > > > > > "As exercise in upgradability of zookeeper, I did a "out-of-the"box" > > upgrade on Zookeeper. I downloaded a generic distribution of Apache > > Zookeeper and used it for the upgrade. > > > > Kafka included version of Zookeeper 3.3.3. > > Out of the box Apache Zookeeper 3.4.5 (which I upgraded to) > > > > Running, working great. I did *not* have to wipe out the zookeeper > > databases. All data stayed intact. > > > > I got a new feature, which allows auto-purging of logs. This keeps OPS > > maintenance to a minimum." > > > > > > thanks, > > rob > > > > > > -----Original Message----- > > From: Withers, Robert [mailto:robert.with...@dish.com] > > Sent: Friday, May 17, 2013 7:38 AM > > To: users@kafka.apache.org > > Subject: RE: are commitOffsets botched to zookeeper? > > > > Fair enough, this is something to look forward to. I appreciate the > > restraint you show to stay out of troubled waters. :) > > > > thanks, > > rob > > > > ________________________________________ > > From: Neha Narkhede [neha.narkh...@gmail.com] > > Sent: Friday, May 17, 2013 7:35 AM > > To: users@kafka.apache.org > > Subject: RE: are commitOffsets botched to zookeeper? > > > > Upgrading to a new zookeeper version is not an easy change. Also > zookeeper > > 3.3.4 is much more stable compared to 3.4.x. We think it is better not to > > club 2 big changes together. So most likely this will be a post 08 item > for > > stability purposes. > > > > Thanks, > > Neha > > On May 17, 2013 6:31 AM, "Withers, Robert" <robert.with...@dish.com> > > wrote: > > > > > Awesome! Thanks for the clarification. I would like to offer my > > > strong vote that this get tackled before a beta, to get it firmly into > > 0.8. > > > Stabilize everything else to the existing use, but make offset updates > > > batched. > > > > > > thanks, > > > rob > > > ________________________________________ > > > From: Neha Narkhede [neha.narkh...@gmail.com] > > > Sent: Friday, May 17, 2013 7:17 AM > > > To: users@kafka.apache.org > > > Subject: RE: are commitOffsets botched to zookeeper? > > > > > > Sorry I wasn't clear. Zookeeper 3.4.x has this feature. As soon as 08 > > > is stable and released it will be worth looking into when we can use > > > zookeeper 3.4.x. > > > > > > Thanks, > > > Neha > > > On May 16, 2013 10:32 PM, "Rob Withers" <reefed...@gmail.com> wrote: > > > > > > > Can a request be made to zookeeper for this feature? > > > > > > > > Thanks, > > > > rob > > > > > > > > > -----Original Message----- > > > > > From: Neha Narkhede [mailto:neha.narkh...@gmail.com] > > > > > Sent: Thursday, May 16, 2013 9:53 PM > > > > > To: users@kafka.apache.org > > > > > Subject: Re: are commitOffsets botched to zookeeper? > > > > > > > > > > Currently Kafka depends on zookeeper 3.3.4 that doesn't have a > > > > > batch > > > > write > > > > > api. So if you commit after every message at a high rate, it will > > > > > be > > > slow > > > > and > > > > > inefficient. Besides it will cause zookeeper performance to > degrade. > > > > > > > > > > Thanks, > > > > > Neha > > > > > On May 16, 2013 6:54 PM, "Rob Withers" <reefed...@gmail.com> > wrote: > > > > > > > > > > > We are calling commitOffsets after every message consumption. > > > > > > It looks to be ~60% slower, with 29 partitions. If a single > > > > > > KafkaStream thread is from a connector, and there are 29 > > > > > > partitions, then commitOffsets sends 29 offset updates, correct? > > > > > > Are these offset updates batched in one send to zookeeper? > > > > > > > > > > > > thanks, > > > > > > rob > > > > > > > > > > > > > >
