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Posted to jira@kafka.apache.org by "sebastienviale (via GitHub)" <gi...@apache.org> on 2026/06/24 16:12:15 UTC
[PR] KFK-19871: A, Add Builder and Runtime for Multipartition for TopologyTestDriver [kafka]
sebastienviale opened a new pull request, #22665:
URL: https://github.com/apache/kafka/pull/22665
**Motivation**
As part of [KIP-1238: Multi-partition support in
TopologyTestDriver.](https://cwiki.apache.org/confluence/display/KAFKA/KIP-1238%3A+Multipartition+for+TopologyTestDriver+in+Kafka+Streams)
`TopologyTestDriver` currently only supports input and output topics with a single partition, making it impossible to test repartition operations without falling back to EmbeddedKafkaCluster-based integration tests.
This follow-up to the `TestRecord` partition support PR introduces the multi-partition execution path itself: a builder to declare topic partition counts, a planner that resolves partition counts across the topology, and a runtime that builds one task per partition and drives routing and processing.
**Changes**
- `TopologyTestDriverBuilder`: new entry point with declareTopic(name, partitions) and build(). Multi-partition mode activates automatically when any declared topic has more than one partition; otherwise the legacy single-task path is preserved.
- `MultiPartitionTopologyPlan`: resolves the partition count of every topic, including internal repartition topics, and validates co-partitioning.
- `MultiPartitionRuntime`: builds one task per (subtopology, partition) and routes/processes records accordingly.
- `TopologyTestDriver`: existing constructors are deprecated in favor of `TopologyTestDriverBuilder`
**Compatibility**
Fully backward compatible — no existing test requires changes. Single-partition mode (no declared topics, or all declared with 1 partition) behaves exactly as today.
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Re: [PR] KFK-19871: A, Add Builder and Runtime for Multipartition for TopologyTestDriver [kafka]
Posted by "sebastienviale (via GitHub)" <gi...@apache.org>.
sebastienviale closed pull request #22665: KFK-19871: A, Add Builder and Runtime for Multipartition for TopologyTestDriver
URL: https://github.com/apache/kafka/pull/22665
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