[jira] [Created] (KAFKA-5825) Streams not processing when exactly once is set

["Ryan Worsley (JIRA)" <ji...@apache.org>]

Ryan Worsley created KAFKA-5825:
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             Summary: Streams not processing when exactly once is set
                 Key: KAFKA-5825
                 URL: https://issues.apache.org/jira/browse/KAFKA-5825
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.11.0.0
         Environment: EmbeddedKafka running on Windows.  Relevant files attached.
            Reporter: Ryan Worsley
         Attachments: build.sbt, log4j.properties, Tests.scala

+Set-up+
I'm using [EmbeddedKafka https://github.com/manub/scalatest-embedded-kafka/] for ScalaTest.

This spins up a single broker internally on a random port.

I've written two tests - the first without transactions, the second with.  They're nearly identical apart from the config and the transactional semantics.  I've written the transactional version based on Neha's [blog https://www.confluent.io/blog/exactly-once-semantics-are-possible-heres-how-apache-kafka-does-it/] which is the closest thing I could find to instructions.

The tests wait until a single message is processed by the streams topology, they use this message to complete a promise that the test is waiting on.  Once the promise completes the test verifies the value of the promise as being the expected value of the message.

+Observed behaviour+
The first test passes fine, the second test times out, the streams processor never seems to read the transactional message.

+Notes+
I've attached my build.sbt, log4j.properties and my Tests.scala file in order to make it as easy as possible for someone to re-create.  I'm running on Windows and using Scala as this reflects my workplace.  I completely expect there to be some configuration issue that's causing this, but am unable to proceed at this time.
Related information: https://github.com/manub/scalatest-embedded-kafka/issues/82



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