Yeah, the Java/Scala clients use the latest protocol version in their requests and that will not work with older brokers if there are incompatible changes (ie 0.9.0.1 clients don't work with 0.8.2.2 brokers, but they do work with 0.9.0.0 brokers). This should be made more explicit in the upgrade notes, it currently says:
"It is important that you upgrade your Kafka cluster before upgrading your clients. If you are using MirrorMaker downstream clusters should be upgraded first as well" Depending on the outcome of KIP-35, things may or may not change in the future. Ismael On 21 Mar 2016 17:52, "Rajiv Kurian" <ra...@signalfx.com> wrote: > They don't work with the old brokers. We made the assumption that they > did and had to roll-back. > > On Mon, Mar 21, 2016 at 10:42 AM, Alexis Midon < > alexis.mi...@airbnb.com.invalid> wrote: > > > Hi Ismael, > > > > could you elaborate on "newer clients don't work with older brokers > > though."? doc pointers are fine. > > I was under the impression that I could the 0.9 clients with 0.8 brokers. > > > > thanks > > > > Alexis > > > > On Mon, Mar 21, 2016 at 2:05 AM Ismael Juma <ism...@juma.me.uk> wrote: > > > > > Hi Allen, > > > > > > Answers inline. > > > > > > On Mon, Mar 21, 2016 at 5:56 AM, allen chan < > > allen.michael.c...@gmail.com> > > > wrote: > > > > > > > 1) I am using the upgrade instructions to upgrade from 0.8 to 0.9. > Can > > > > someone tell me if i need to continue to bump the > > > > inter.broker.protocol.version after each upgrade? Currently the > broker > > > code > > > > is 0.9.0.1 but i have the config file listing as > > > > inter.broker.protocol.versi > > > > on=0.9.0.0 > > > > > > > > > > When it comes to inter.broker.protocol.version, 0.9.0.0 and 0.9.0.1 are > > the > > > same , so you don't have to. Internally, they are both mapped to > 0.9.0.X. > > > > > > > > > > 2) Is it possible to use multiple variations of producers / > consumers? > > > > My broker is on 0.9.0.1 and i am currently using 0.8.x > > > producer/consumer. I > > > > want to test the new producer first then the new consumer. So would > > there > > > > be issues if the setup was: > > > > 0.9.x producer -> 0.9.x broker -> 0.8.x consumer > > > > > > > > > > Newer brokers support older clients, so this is fine. Note that newer > > > clients don't work with older brokers though. > > > > > > Ismael > > > > > >
