junrao commented on a change in pull request #11470:
URL: https://github.com/apache/kafka/pull/11470#discussion_r745109562
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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:
It seems that the fix in https://github.com/apache/kafka/pull/5798 was
incorrect. The changes for the comment were intended for
InterceptorCallback.onComplete. For Callback.onCompletion, currently, if there
is an exception, it seems that metadata will always be null.
For now, we could probably just revert the comment on Callback.onCompletion.
It's probably useful to make the behavior consistent between
Callback.onCompletion and InterceptorCallback.onComplete. We could file a jira
to track that since it probably needs a KIP.
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