Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2108#discussion_r68081660
--- Diff:
flink-streaming-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerBase.java
---
@@ -50,11 +53,13 @@
/**
* Flink Sink to produce data into a Kafka topic.
*
- * Please note that this producer does not have any reliability guarantees.
+ * Please note that this producer provides at-least-once reliability
guarantees when
+ * checkpoints are enabled and setFlushOnCheckpoint(true) is set.
+ * Otherwise, the producer doesn't provide any reliability guarantees.
--- End diff --
Does it make sense to completely remove the old behaviour and always enable
flush on checkpoint? I'm wondering, because who would like to use a
KafkaProducer with not processing guarantees?
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