soceanainn commented on a change in pull request #11470:
URL: https://github.com/apache/kafka/pull/11470#discussion_r745122437
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File path: clients/src/main/java/org/apache/kafka/clients/producer/Callback.java
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@@ -25,10 +25,12 @@
/**
* A callback method the user can implement to provide asynchronous
handling of request completion. This method will
* be called when the record sent to the server has been acknowledged.
When exception is not null in the callback,
- * metadata will contain the special -1 value for all fields except for
topicPartition, which will be valid.
+ * and the exception is a subclass of ApiException, metadata will be null.
For all other exceptions, metadata will
Review comment:
I don't think metadata will always be null, as the updated metadata will
sometimes be passed to the user callback as far as I can see from the
InterceptorCallback implementation (see
[here](https://github.com/apache/kafka/blob/3.1/clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java#L1387-L1390)).
I believe we have been seeing a mixture of null metadata + placeholder
metadata in our Kafka deployment (v2.3.1), which has caused some issues for my
team.
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