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ASF GitHub Bot commented on KAFKA-6749: --------------------------------------- jadireddi opened a new pull request #4912: KAFKA-6749: Fixed TopologyTestDriver to process stream processing guarantee as exactly once URL: https://github.com/apache/kafka/pull/4912 https://issues.apache.org/jira/browse/KAFKA-6749 Fixed Stream processing topologies which are configured to use EXACTLY_ONCE processing guarantee can be tested with the `TopologyTestDriver`. *More detailed description of your change, if necessary. The PR title and PR message become the squashed commit message, so use a separate comment to ping reviewers.* *Summary of testing strategy (including rationale) for the feature or bug fix. Unit and/or integration tests are expected for any behaviour change and system tests should be considered for larger changes.* ### Committer Checklist (excluded from commit message) - [ ] Verify design and implementation - [ ] Verify test coverage and CI build status - [ ] Verify documentation (including upgrade notes) ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > 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 > Assignee: Jagadesh Adireddi > Priority: Minor > Labels: newbie > > 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 on the > ML|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)