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https://issues.apache.org/jira/browse/KAFKA-13763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Egerton resolved KAFKA-13763.
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Resolution: Done
> Improve unit testing coverage and flexibility 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
> Priority: Minor
>
> 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)
> But other improvements may be added in a pull request that addresses the
> above as they come up.
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