Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/2108#discussion_r68082639
--- 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 --
My reasoning here was that we first provide this as an optional feature to
those users who know what they are doing / what they need to give the feature
exposure.
I want to be certain that it works in all environments before we activate
it by default.
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