They are both true. The Apache text is talking about the compatibility of the Producer/Consumer API and the Confluent text is talking about the Streams API.
-hans > On Mar 31, 2017, at 11:46 PM, Roger Vandusen > <roger.vandu...@ticketmaster.com> wrote: > > Read below and answer: So which is the source of truth ? > Is 0.10.2.0 compatible to 0.10.0 or 0.10.1? > > Which site needs correction? > > > From current Kafka docs. > Statement from Kafka site: > https://kafka.apache.org/documentation/#upgrade > > 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. Before 0.10.2, Kafka > is backward compatible, > which means that clients from Kafka 0.8.x releases (CP 1.0.x) will work with > brokers from Kafka 0.9.x, 0.10.0, 0.10.1 and 0.10.2 > releases (CP 2.0.x, 3.0.x, 3.1.x and 3.2.x), but not vice-versa. > This means you always need to plan upgrades such that all brokers are > upgraded before clients. > > > Hmm...do some more reading and research on Confluent site found this which > seems to contradict the above statement: > http://docs.confluent.io/3.2.0/streams/upgrade-guide.html > > > Upgrading from CP 3.1.x (Kafka 0.10.1.x-cp2) to CP 3.2.0 (Kafka 0.10.2.0-cp1) > Compatibility > Kafka Streams applications built with CP 3.2.0 (Kafka 0.10.2.0-cp1) are > forward and backward compatible with certain Kafka clusters. > > Compatibility Matrix: > > > Kafka Broker (columns) > > Streams API (rows) > > 3.0.x / 0.10.0.x > > 3.1.x / 0.10.1.x > > 3.2.0 / 0.10.2.0 > > 3.0.x / 0.10.0.x > > compatible > > compatible > > compatible > > 3.1.x / 0.10.1.x > > > > compatible > > compatible > > 3.2.0 / 0.10.2.0 > > > > compatible > > compatible > > > EMPHASIS ON CONTRADICTION BELOW from site desciption: > > Backward-compatible to CP 3.1.x clusters (Kafka 0.10.1.x-cp2): > This is the first release allowing to upgrade your Kafka Streams application > without a broker upgrade. > New Kafka Streams applications built with CP 3.2.0 (Kafka 0.10.2.x-cp1) will > work with older Kafka clusters running CP 3.1.x (Kafka 0.10.1.x-cp2). > Kafka clusters running CP 3.0.x (Kafka 0.10.0.x-cp1) are not compatible with > new CP 3.2.0 Kafka Streams applications though. > > -Roger >
