Chris Egerton created KAFKA-13763:
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Summary: Improve unit testing coverage for
IncrementalCooperativeAssignor
Key: KAFKA-13763
URL: https://issues.apache.org/jira/browse/KAFKA-13763
Project: Kafka
Issue Type: Improvement
Components: KafkaConnect
Reporter: Chris Egerton
Assignee: Chris Egerton
The
[tests|https://github.com/apache/kafka/blob/dcd09de1ed84b43f269eb32fc2baf589a791d468/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/distributed/IncrementalCooperativeAssignorTest.java]
for the {{IncrementalCooperativeAssignor}} class provide a moderate level of
coverage and cover some non-trivial cases, but there are some areas for
improvement that will allow us to iterate on the assignment logic for Kafka
Connect faster and with greater confidence.
These improvements include:
* Adding reusable utility methods to assert that a cluster's assignment is
*balanced* (the difference in the number of connectors and tasks assigned to
any two workers is at most one) and *complete* (all connectors and tasks are
assigned to a worker)
* Removing the existing
[assertAssignment|https://github.com/apache/kafka/blob/dcd09de1ed84b43f269eb32fc2baf589a791d468/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/distributed/IncrementalCooperativeAssignorTest.java#L1373-L1405]
methods and replacing them with a more fine-grained alternative that allows
for more granular assertions about the number of tasks/connectors
assigned/revoked from each worker during a round of rebalance, instead of the
total for the entire cluster
* Adding a reusable utility method to assert the current distribution of
connectors and tasks across the cluster
* Decomposing large portions of repeated code for simulating a round of
rebalancing into a reusable utility method
* Renaming variable names to improve accuracy/readability (the
{{expectedMemberConfigs}} field, for example, is pretty poorly named)
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