Are you upgrading your Kafka servers or your applications' client
libraries? We upgraded our client libraries and then ran into an
incompatibility when the upgraded client ran with an older broker cluster.
But the issue was fixed by simply adding an ACL for IdempotentWrite on the
brokers. This page was a very valuable explanation of this issue:

https://kpow.io/articles/kafka-producer-breaking-change/

-- 

Patrick Taylor

Sr. Principal Software Engineer
ptay...@snaplogic.com
Mobile: 303-594-8979
Boulder, Colorado (US Mountain Time)


<http://www.snaplogic.com/about-us/jobs>



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