Thomas Schulz created KAFKA-4473:
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Summary: KafkaStreams does *not* guarantee at-least-once delivery
Key: KAFKA-4473
URL: https://issues.apache.org/jira/browse/KAFKA-4473
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.1.0
Reporter: Thomas Schulz
Priority: Critical
see: https://groups.google.com/forum/#!topic/confluent-platform/DT5bk1oCVk8
There is probably a bug in the RecordCollector as described in my detailed
Cluster test published in the aforementioned post.
The class RecordCollector has the following behavior:
- if there is no exception, add the message offset to a map
- otherwise, do not add the message offset and instead log the above statement
Is it possible that this offset map contains the latest offset to commit? If
so, a message that fails might be overriden be a successful (later) message and
the consumer commits every message up to the latest offset?
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