[jira] [Created] (KAFKA-5322) Resolve AddPartitions response error code inconsistency

["Jason Gustafson (JIRA)" <ji...@apache.org>]

Jason Gustafson created KAFKA-5322:
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             Summary: Resolve AddPartitions response error code inconsistency
                 Key: KAFKA-5322
                 URL: https://issues.apache.org/jira/browse/KAFKA-5322
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson
            Priority: Blocker


The AddPartitions request does not support partial failures. Either all partitions are successfully added to the transaction or none of them are. Currently we return a separate error code for each partition that was added to the transaction, which begs the question of what error code to return if we have not actually encountered a fatal partition-level error for some partition. For example, suppose we send AddPartitions with partitions A and B. If A is not authorized, we will not even attempt to add B to the transaction, but what error code should we use. The current solution is to only include partition A and its error code in the response, but this is a little inconsistent with most other request types. Alternatives that have been proposed:

1. Instead of a partition-level error, use one global error. We can add a global error message to return friendlier details to the user about which partition had a fault. The downside is that we would have to parse the message contents if we wanted to do any partition-specific handling. We could not easily fill the set of topics in {{TopicAuthorizationException}} for example.
2. We can add a new error code to indicate that the broker did not even attempt to add the partition to the transaction. For example: OPERATION_NOT_ATTEMPTED or something like that. 



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