[jira] [Created] (KAFKA-9776) Producer should automatically downgrade CommitTxRequest

["Matthias J. Sax (Jira)" <ji...@apache.org>]

Matthias J. Sax created KAFKA-9776:
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             Summary: Producer should automatically downgrade CommitTxRequest
                 Key: KAFKA-9776
                 URL: https://issues.apache.org/jira/browse/KAFKA-9776
             Project: Kafka
          Issue Type: Improvement
          Components: producer 
    Affects Versions: 2.5.0
            Reporter: Matthias J. Sax


When using transactions with a 2.5 producer against 2.4 (or older) brokers, it is not possible to call `producer.commitTransaction(..., ConsumerGroupMetadata)` but only the old API `producer.commitTransaction(..., String applicationId)` is supported.

This implies that a developer needs to know the broker version when writing an application or write additional code to call the one or the other API depending on the broker version (the developer would need to write code to figure out the broker version, too).

We should change the producer to automatically downgrade to the older CommitTxRequest if `commitTransaction(..., ConsumerGroupMetadata)` is used against older brokers to avoid an `UnsupportedVersionException`.



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