[jira] [Created] (KAFKA-6749) TopologyTestDriver fails when topoloy under test uses EXACTLY_ONCE

["Frederic Arno (JIRA)" <ji...@apache.org>]

Frederic Arno created KAFKA-6749:
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             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]



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