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https://issues.apache.org/jira/browse/KAFKA-7042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-7042.
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Resolution: Not A Problem
> Fall back to the old behavior when the broker is too old to recognize
> LIST_OFFSET versions
> ------------------------------------------------------------------------------------------
>
> Key: KAFKA-7042
> URL: https://issues.apache.org/jira/browse/KAFKA-7042
> Project: Kafka
> Issue Type: Improvement
> Components: consumer
> Reporter: Guozhang Wang
> Priority: Major
>
> When READ_COMMITTED is turned on (since 0.11.0), LIST_OFFSET requires
> min_version to be 2 on the consumer client side. On the other hand, if broker
> is no newer than 0.10.2 it can only recognize the version of LIST_OFFSET up
> to 1. In this case the consumer talking to such an old broker will throw an
> exception right away.
> What we can improve though, is that when the consumer realized broker does
> not recognize LIST_OFFSET of at least 2, it can fall back to the old behavior
> of READ_UNCOMMITTED since the data on that broker should not have any txn
> markers anyways. By doing this we would lift the hard restriction that
> consumers with READ_COMMITTED cannot work with an older version of broker
> (remember we are trying to achieve broker compatibility since 0.10.0).
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