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Posted to jira@kafka.apache.org by "shizhenzhen (Jira)" <ji...@apache.org> on 2021/10/28 12:49:00 UTC
[jira] [Updated] (KAFKA-13226) Partition expansion may cause uneven
distribution
[ https://issues.apache.org/jira/browse/KAFKA-13226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
shizhenzhen updated KAFKA-13226:
--------------------------------
Reviewer: Guozhang Wang (was: Zhanxiang (Patrick) Huang)
> 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: 2.5.0, 2.8.0, 2.7.1, 2.6.2
> Environment: mac
> kafka-2.5.0
> Reporter: shizhenzhen
> Priority: Major
>
>
> {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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