Eslam Mohamed created KAFKA-18873:
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Summary: Incorrect error message for
max.in.flight.requests.per.connection when using transactional producer.
Key: KAFKA-18873
URL: https://issues.apache.org/jira/browse/KAFKA-18873
Project: Kafka
Issue Type: Bug
Components: clients
Reporter: Eslam Mohamed
Assignee: Eslam Mohamed
{code:java}
KafkaProducerTest.testInflightRequestsAndIdempotenceForIdempotentProduces{code}
{{Above unit test }}checks for configuration validation errors when
instantiating a {{ProducerConfig}} with invalid properties. One of the
assertions in this test "invalidProps4" is designed to validate the constraint
that {{max.in.flight.requests.per.connection}} must be at most {{5}} when using
a transactional producer. However, the error message thrown by the
{{ProducerConfig}} constructor in this scenario is incorrect.
* *Observed Behavior:*
When {{max.in.flight.requests.per.connection}} is set to {{6}} for a
transactional producer, the test expects an exception with the message:
{{"Must set max.in.flight.requests.per.connection to at most 5 when using the
transactional producer."}}
Instead, the error message states:
{{"Must set retries to non-zero when using the idempotent producer."}}
* *Expected Behavior:*
The error message should explicitly indicate the violation of the
{{max.in.flight.requests.per.connection}} constraint for transactional
producers:
{{"Must set max.in.flight.requests.per.connection to at most 5 when using the
transactional producer."}}
The mismatch in the error message can lead to confusion for developers
debugging the configuration error, as it incorrectly hints at a {{retries}}
configuration issue instead of the actual
{{max.in.flight.requests.per.connection}} issue.
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