Upgrading brokers without client was always supported :) Since 0.10.2, it also works the other way round.
-Matthias On 11/28/17 7:33 AM, Brian Cottingham wrote: > On 11/27/17, 8:36 PM, "Matthias J. Sax" <matth...@confluent.io> wrote: > > Not sure were you exactly copied this. However, second paragraph here > https://kafka.apache.org/documentation/#upgrade_10_2_0 explains: > > > Starting with version 0.10.2, Java clients (producer and consumer) have > acquired the ability to communicate with older brokers. Version 0.10.2 > clients can talk to version 0.10.0 or newer brokers. However, if your brokers > are older than 0.10.0, you must upgrade all the brokers in the Kafka cluster > before upgrading your clients. Version 0.10.2 brokers support 0.8.x and newer > clients. > > Ah. I see. You copied from the KIP. > > The "Motivation" sections describes the state _before_ the change :) > > > I think we may be talking about different goals; if I understand correctly, > you’re discussing upgrading clients without upgrading brokers. I want to do > the opposite: upgrade brokers and leave the clients alone. It sounds like > that should work fine, right? >
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