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https://issues.apache.org/jira/browse/KAFKA-10888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao resolved KAFKA-10888.
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Fix Version/s: 3.3.0
Resolution: Fixed
merged the PR to trunk. Thanks [~alivshits] for the design, implementation and
the testing.
> Sticky partition leads to uneven product msg, resulting in abnormal delays
> in some partitions
> ----------------------------------------------------------------------------------------------
>
> Key: KAFKA-10888
> URL: https://issues.apache.org/jira/browse/KAFKA-10888
> Project: Kafka
> Issue Type: Bug
> Components: clients, producer
> Affects Versions: 2.4.1
> Reporter: jr
> Assignee: Artem Livshits
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: image-2020-12-24-21-05-02-800.png,
> image-2020-12-24-21-09-47-692.png, image-2020-12-24-21-10-24-407.png
>
>
> 110 producers ,550 partitions ,550 consumers , 5 nodes Kafka cluster
> The producer uses the nullkey+stick partitioner, the total production rate
> is about 100w tps
> Observed partition delay is abnormal and message distribution is uneven,
> which leads to the maximum production and consumption delay of the partition
> with more messages
> abnormal.
> I cannot find reason that stick will make the message distribution uneven
> at this production rate.
> I can't switch to the round-robin partitioner, which will increase the
> delay and cpu cost. Is thathe stick partationer design cause uneven message
> distribution, or this is abnormal. How to solve it?
> !image-2020-12-24-21-09-47-692.png!
> As shown in the picture, the uneven distribution is concentrated on some
> partitions and some brokers, there seems to be some rules.
> This problem does not only occur in one cluster, but in many high tps
> clusters,
> The problem is more obvious on the test cluster we built.
> !image-2020-12-24-21-10-24-407.png!
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