KAFKA-10844: KStream mark as partitioned#22221
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zheguang wants to merge 4 commits intoapache:trunkfrom
Open
KAFKA-10844: KStream mark as partitioned#22221zheguang wants to merge 4 commits intoapache:trunkfrom
zheguang wants to merge 4 commits intoapache:trunkfrom
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This patch implements KIP-759: Unneeded repartition cancelling. The "unneeded" part is entirely by the user's own judgement :)
A stream with key-changing operation can be marked as partitioned as intended to avoid repartition inserted to its topology. The main use case is for aggregation by a "composite key" -- a stream partitioned by key A can readily aggregate by composite key (A, B) without repartition. The reason being given two records, if their (A, B) are equal, then their A is equal.
Test:
markAsPartitionedis no-op when no key changingmarkAsPartitionedshould not repartition in resulting topologymarkAsPartitioned