Frederic Arno created KAFKA-6749: ------------------------------------ Summary: TopologyTestDriver fails when topoloy under test uses EXACTLY_ONCE Key: KAFKA-6749 URL: https://issues.apache.org/jira/browse/KAFKA-6749 Project: Kafka Issue Type: Bug Components: streams Affects Versions: 1.1.0 Reporter: Frederic Arno
Stream processing topologies which are configured to use `EXACTLY_ONCE` processing guarantee cannot be tested with the `TopologyTestDriver`. Tests usually crash with `java.lang.IllegalStateException: MockProducer hasn't been initialized for transactions` within the second call to `TopologyTestDriver.pipeInput()`, the first call works fine. Changing the processing guarantee to `AT_LEAST_ONCE` makes tests pass. This is a problem because it is expected that proper processor topologies can be successfully tested using `TopologyTestDriver`, however `TopologyTestDriver` can't handle `EXACTLY_ONCE` and crashes during tests. To a developer, this usually means that there is something wrong with their processor topologies. Kafka developpers can reproduce this by adding: {code:java} put(StreamsConfig.PROCESSING_GUARANTEE_CONFIG, StreamsConfig.EXACTLY_ONCE);{code} to line 88 of TopologyTestDriverTest: streams/test-utils/src/test/java/org/apache/kafka/streams/TopologyTestDriverTest.java Originally reported here: [http://mail-archives.apache.org/mod_mbox/kafka-users/201804.mbox/%3C54ab29ad-44e1-35bd-9c16-c1d8d68a88db%40gmail.com%3E] -- This message was sent by Atlassian JIRA (v7.6.3#76005)