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https://issues.apache.org/jira/browse/KAFKA-13226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435385#comment-17435385
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shizhenzhen commented on KAFKA-13226:
-------------------------------------
我在尝试修复它的时候, 我发现就算修复了KafkaZkClient#getAllBrokerAndEpochsInCluster 那里的toMap
不排序的问题, 仍然是不能够解决这个问题的,因为在UPDATAMETADATA
请求的时候也做了更新,会导致将之前已经排序的覆盖掉,所以UPDATAMETADATA也需要做处理,
但是整个集群就算不是排序的,也没有什么问题,除了createTopic的时候,所以我在解决这个bug的时候,只是在createTopic那里做了一下排序,这样改动最小,可以完美的解决问题
> 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, 2.8.1, 3.0.0
> 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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