Yes, if you read the upgrade documentation, you'll see "it is important to upgrade your Kafka clusters before upgrading your clients" mentioned:
http://kafka.apache.org/documentation.html#upgrade It is also a common question in the mailing lists. It should probably be in the FAQ. Ismael On Tue, May 31, 2016 at 8:46 AM, Mikael Ståldal <mikael.stal...@magine.com> wrote: > Is this documented somewhere? > > On Mon, May 30, 2016 at 8:16 PM, Ismael Juma <ism...@juma.me.uk> wrote: > > > Hi Mikael, > > > > This is expected. Older clients work with newer brokers, but newer > clients > > don't work with older brokers. > > > > Ismael > > On 30 May 2016 17:29, "Mikael Ståldal" <mikael.stal...@magine.com> > wrote: > > > > > I am experiencing compatibility issues between different versions of > > Kafka > > > server and kafka-clients library. > > > > > > kafka-client 0.8.2.2 to Kafka server 0.9.0.1 works fine, > > > but when using kafka-client 0.9.0.1 to Kafka server 0.8.2.2 I get > timeout > > > when waiting for the future returned by Producer.send(). The message is > > > properly sent without delay though. > > > > > > Code is here: > > > > > > > > > https://github.com/apache/logging-log4j2/blob/master/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/mom/kafka/KafkaManager.java > > > > > > Problem: > > > java.util.concurrent.TimeoutException: Timeout after waiting for 30000 > > ms. > > > at > > > > > > > > > org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:50) > > > at > > > > > > > > > org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:25) > > > at > > > > > > > > > org.apache.logging.log4j.core.appender.mom.kafka.KafkaManager.send(KafkaManager.java:81) > > > > > > -- > > > [image: MagineTV] > > > > > > *Mikael Ståldal* > > > Senior software developer > > > > > > *Magine TV* > > > mikael.stal...@magine.com > > > Grev Turegatan 3 | 114 46 Stockholm, Sweden | www.magine.com > > > > > > Privileged and/or Confidential Information may be contained in this > > > message. If you are not the addressee indicated in this message > > > (or responsible for delivery of the message to such a person), you may > > not > > > copy or deliver this message to anyone. In such case, > > > you should destroy this message and kindly notify the sender by reply > > > email. > > > > > > > > > -- > [image: MagineTV] > > *Mikael Ståldal* > Senior software developer > > *Magine TV* > mikael.stal...@magine.com > Grev Turegatan 3 | 114 46 Stockholm, Sweden | www.magine.com > > Privileged and/or Confidential Information may be contained in this > message. If you are not the addressee indicated in this message > (or responsible for delivery of the message to such a person), you may not > copy or deliver this message to anyone. In such case, > you should destroy this message and kindly notify the sender by reply > email. >
