dajac opened a new pull request, #16088:
URL: https://github.com/apache/kafka/pull/16088
This patch optimizes uniform (homogenous) assignor by avoiding creating a
copy of all the assignments. Instead, the assignor creates a copy only if the
assignment is updated. It is a sort of copy-on-write. This change reduces the
overhead of the TargetAssignmentBuilder when ran with the uniform (homogenous)
assignor.
Trunk:
```
Benchmark (memberCount)
(partitionsToMemberRatio) (topicCount) Mode Cnt Score Error Units
TargetAssignmentBuilderBenchmark.build 10000
10 100 avgt 5 24.535 ± 1.583 ms/op
TargetAssignmentBuilderBenchmark.build 10000
10 1000 avgt 5 24.094 ± 0.223 ms/op
JMH benchmarks done
```
```
Benchmark (assignmentType)
(assignorType) (isRackAware) (memberCount) (partitionsToMemberRatio)
(subscriptionType) (topicCount) Mode Cnt Score Error Units
ServerSideAssignorBenchmark.doAssignment INCREMENTAL
UNIFORM false 10000 10
HOMOGENEOUS 100 avgt 5 14.697 ± 0.133 ms/op
ServerSideAssignorBenchmark.doAssignment INCREMENTAL
UNIFORM false 10000 10
HOMOGENEOUS 1000 avgt 5 15.073 ± 0.135 ms/op
JMH benchmarks done
```
Patch:
```
Benchmark (memberCount)
(partitionsToMemberRatio) (topicCount) Mode Cnt Score Error Units
TargetAssignmentBuilderBenchmark.build 10000
10 100 avgt 5 3.376 ± 0.577 ms/op
TargetAssignmentBuilderBenchmark.build 10000
10 1000 avgt 5 3.731 ± 0.359 ms/op
JMH benchmarks done
```
```
Benchmark (assignmentType)
(assignorType) (isRackAware) (memberCount) (partitionsToMemberRatio)
(subscriptionType) (topicCount) Mode Cnt Score Error Units
ServerSideAssignorBenchmark.doAssignment INCREMENTAL
UNIFORM false 10000 10
HOMOGENEOUS 100 avgt 5 1.975 ± 0.086 ms/op
ServerSideAssignorBenchmark.doAssignment INCREMENTAL
UNIFORM false 10000 10
HOMOGENEOUS 1000 avgt 5 2.026 ± 0.190 ms/op
JMH benchmarks done
```
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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