Details
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Improvement
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Status: Resolved
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Minor
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Resolution: Fixed
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None
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Description
From this code comments, it is said that Kafka client Producer's DefaultPartitioner will do round robin if "no partition or key is present",
https://github.com/apache/kafka/blob/41e676d29587042994a72baa5000a8861a075c8c/clients/src/main/java/org/apache/kafka/clients/producer/internals/DefaultPartitioner.java#L34
from the code it looks trying to do round robin as well, as it maintained a counter and try to increase it every time and then will decide which partition to go to;
However the issue here is the counter is a global counter that is shared by all the topics, so it is actually not round robin per topic and sometimes caused unbalanced routing among different partitions.
Although we can pass a custom implementation of interface "org.apache.kafka.clients.producer.Partitioner", it might be still good to make the default implementation true round robin as comment.
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