shizhenzhen created KAFKA-13226:
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Summary: Partition expansion may cause uneven distribution
Key: KAFKA-13226
URL: https://issues.apache.org/jira/browse/KAFKA-13226
Project: Kafka
Issue Type: Bug
Components: controller
Affects Versions: 2.6.2, 2.7.1, 2.8.0, 2.5.0
Environment: mac
kafka-2.5.0
Reporter: shizhenzhen
{color:#ff0000}*Partition expansion may cause uneven distribution*{color}
1. Create a Topic , 3-partition 1-replical
!https://img-blog.csdnimg.cn/561112064b114acfb03882aa09100e0e.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_Q1NETiBA55-z6Ie76Ie755qE5p2C6LSn6ZO6,size_55,color_FFFFFF,t_70,g_se,x_16!
2. partition expansion to 5 - partiton
!https://img-blog.csdnimg.cn/f7c3c33b6662457080d9bb5bb190c0c2.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_Q1NETiBA55-z6Ie76Ie755qE5p2C6LSn6ZO6,size_49,color_FFFFFF,t_70,g_se,x_16!
3. Does this meet expectations ？
!https://img-blog.csdnimg.cn/20cc1007c4214c4ebfcb1b2c2eeb98e4.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_Q1NETiBA55-z6Ie76Ie755qE5p2C6LSn6ZO6,size_18,color_FFFFFF,t_70,g_se,x_16!
{color:#ff0000}*so this is a bug ?*{color}
The problem may arise here ;
When we create a new topic . get the broker list is a Object Map ;
*This is disordered*
you can read the code , first it have sortBy brokerId, but finally it convert
to a *disorde Map;*
!https://img-blog.csdnimg.cn/131b9bf0c19e4753a73512af4c9c5854.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_Q1NETiBA55-z6Ie76Ie755qE5p2C6LSn6ZO6,size_66,color_FFFFFF,t_70,g_se,x_16!
The important thing is that it has been sorted when expanding the partition and
parition-reassignment ;
{color:#ff0000}*So why not sort when creating topics?*{color}
If the topic is sorted when create a new topic , this problem will not occur ;
so it maybe is a tiny bug ?
if you can read Chinese ,
You can look at this article. I describe it in detail
We look forward to receiving your reply
如果你能看懂中文,可以看看这篇文章 我描述的很详细!
[This may be a Kafka
bug？|[https://shirenchuang.blog.csdn.net/article/details/119912418]]
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