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From Hans Jespersen <h...@confluent.io>
Subject Re: Which is True? Kafka site vs Confluent 3.2 site upgrade doc details contradiction regarding 0.10.2 clients backward compatible to resp. 0.10.0 vs 0.10.1?
Date Sat, 01 Apr 2017 07:27:13 GMT
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.vandusen@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
> 

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