shizhenzhen created KAFKA-13226: ----------------------------------- 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]] -- This message was sent by Atlassian Jira (v8.3.4#803005)