Github user tzulitai commented on a diff in the pull request: https://github.com/apache/flink/pull/3278#discussion_r100482362 --- Diff: flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerBaseTest.java --- @@ -293,6 +293,61 @@ public void run() { testHarness.close(); } + /** + * This test is meant to assure that testAtLeastOnceProducer is valid by testing that if flushing is disabled, + * the snapshot method does indeed finishes without waiting for pending records; + * we set a timeout because the test will not finish if the logic is broken + */ + @Test(timeout=5000) + public void testDoesNotWaitForPendingRecordsIfFlushingDisabled() throws Throwable { + final OneShotLatch inputLatch = new OneShotLatch(); + + final DummyFlinkKafkaProducer<String> producer = new DummyFlinkKafkaProducer<>( --- End diff -- Turns out that we must have an extension of `KafkaProducer` provided to `FlinkKafkaProducerBase`. The reason is that the producer base requires implementing an abstract `flush` method, which doesn't exist on the `KafkaProducer`'s interface. So it'll be more straightforward to extend `KafkaProducer` and implement a `flush` method ourselves, and let `FlinkKafkaProducerBase` call that.
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