David G created KAFKA-13359:
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Summary: Round Robin Kafka Producer Routes to only half the
partitions when even number of partitions
Key: KAFKA-13359
URL: https://issues.apache.org/jira/browse/KAFKA-13359
Project: Kafka
Issue Type: Bug
Components: producer
Affects Versions: 3.0.0, 2.7.0
Reporter: David G
When you have 1 message per batch, in the round robin Partitioner. The messages
go only to half the partitions beacuse it always skips 1 partition. This works
out for odd number of partitions because skipping 1 will mean all partitions
get a hit eventually, but with an even number half the partitions never get
selected.
So if you have partitions 1, 2, 3, 4
Message 1: Partion 1
Message 2: Partion 3
Message 3: Partion 1 ... so on. [ Here 2 and 4 are never selected]
If you have partitions 1, 2, 3
Message 1: Partion 1
Message 2: Partion 3
Message 3: Partion 2 .. so on
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