Andrew Schofield created KAFKA-17541:
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Summary: Improve handling of delivery count
Key: KAFKA-17541
URL: https://issues.apache.org/jira/browse/KAFKA-17541
Project: Kafka
Issue Type: Sub-task
Reporter: Andrew Schofield
Assignee: Andrew Schofield
There are two situations in which the delivery count handling needs to be more
intelligent.
First, for records which are automatically released as a result of closing a
share session normally, the delivery count should not be incremented. These
records were fetched but they were not actually delivered to the client since
the disposition of the delivery records is carried in the ShareAcknowledge
which closes the share session. Any remaining records were not delivered, only
fetched.
Second, for records which have a delivery count which is more than 1 or 2,
there is a suspicion that the records are not being delivered due to a problem
rather than just natural retrying. The batching of these records should be
reduced, even down to a single record as a time so we do not have the failure
to deliver a poisoned record actually causing adjacent records to be considered
unsuccessful and potentially reach the delivery count limit without proper
reason.
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