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https://issues.apache.org/jira/browse/KAFKA-17198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuze Yang updated KAFKA-17198:
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Attachment: broker list is ordered.png
broker list is unordered.png
> Partition imbalance after alter due to inconsistent order of broker list
> ------------------------------------------------------------------------
>
> Key: KAFKA-17198
> URL: https://issues.apache.org/jira/browse/KAFKA-17198
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.7.2
> Reporter: Xuze Yang
> Assignee: Xuze Yang
> Priority: Major
> Attachments: broker list is ordered.png, broker list is
> unordered.png, partion distributed not evenly.png
>
>
> Three broker environments. Create a topic with 1 replica and 2 partition, and
> then alter the topic to 3 partitions, which are not evenly distributed across
> 3 brokers.
> command as belows：
> {code:java}
> #Create a topic with 1 replica and 2 partitions
> kafka-topics.sh --create --bootstrap-server xx.xx.xx.xx:9092
> --replication-factor 1 --partitions 2 --topic test
> #Alter to 3 partitions
> kafka-topics.sh --bootstrap-server xx.xx.xx.xx:9092 --alter --topic test
> --partitions 3
> #View the distribution of topic partitions
> kafka-topics.sh --bootstrap-server xx.xx.xx.xx:9092 --describe --topic test
> {code}
> Repeat the above command 5 times to obtain 5 topics: test1, test2, test3,
> test4, and test5. The partition distribution of the 5 topics is shown below:
> !partion distributed not evenly.png!
> It can be seen that each topic's 3 partitions are only distributed on 2
> brokers, instead of the expected 3 brokers.
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