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KAFKA-8880: Docs on upgrade-guide. #7385

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KAFKA-8880: Docs on upgrade-guide. #7385

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Expand Up @@ -40,6 +40,11 @@ <h5><a id="upgrade_240_notable" href="#upgrade_240_notable">Notable changes in 2
it may result in uneven distribution of records across partitions in edge cases. Generally users will not be impacted, but this difference may be noticeable in tests and
other situations producing records for a very short amount of time.
</li>
<li>The blocking <code>KafkaConsumer#committed</code> methods have been extended to allow a list of partitions as input parameters rather than a single partition.
It enables fewer request/response iterations between clients and brokers fetching for the committed offsets for the consumer group.
The old overloaded functions are deprecated and we would recommend users to make their code changes to leverage the new methods (details
can be found in <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-520%3A+Add+overloaded+Consumer%23committed+for+batching+partitions">KIP-520</a>).
</li>
</ul>

<h4><a id="upgrade_2_3_0" href="#upgrade_2_3_0">Upgrading from 0.8.x, 0.9.x, 0.10.0.x, 0.10.1.x, 0.10.2.x, 0.11.0.x, 1.0.x, 1.1.x, 2.0.x or 2.1.x or 2.2.x to 2.3.0</a></h4>
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