[jira] [Created] (KAFKA-10888) Sticky partition leads to uneven product msg, resulting in abnormal delays in some partations

["jr (Jira)" <ji...@apache.org>]

jr created KAFKA-10888:
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             Summary:  Sticky partition leads to uneven product msg, resulting in abnormal delays in some partations
                 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
         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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