The document discusses updates in Spring for Apache Kafka, highlighting the KIP-62 improvement that allows consumers to send heartbeats from a background thread, thus reducing the risk of unexpected rebalances in version 2.0. It outlines the threading model transition from two threads to one, simplifying the process while enhancing support for slow listeners. The changes have been back-ported to version 1.3 to accommodate the Kafka 0.11.x.x framework.

1. What’s New in Spring for Apache
Kafka
By Gary Russell
@gprussell
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2. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Compatibility Matrix (project page)
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3. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 3

4. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 4

5. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
KIP-62 == Freedom!!
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KIP-62 (https://cwiki.apache.org/confluence/display/KAFKA/KIP-
62%3A+Allow+consumer+to+send+heartbeats+from+a+background+thread)
• removed the danger of an unexpected rebalance due to a slow listener
• (poll() not called often enough)
• allowed threading model to be rewritten in 2.0
• before 2.0 - 2 threads - consumer + listener
• pause/resume for slow listeners
• 2.0 - 1 thread (consumer) - client takes care of heartbeats
• Back-ported to 1.3 when we decided to create a 1.x version to support
0.11.x.x (driven by the implementation of the kafka11 binder for Spring Cloud
Stream)

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