[jira] [Commented] (KAFKA-2336) Changing offsets.topic.num.partitions after the offset topic is created breaks consumer group partition assignment

["Grant Henke (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-2336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629815#comment-14629815 ] 

Grant Henke commented on KAFKA-2336:
------------------------------------

Created reviewboard https://reviews.apache.org/r/36548/diff/
 against branch origin/trunk

> Changing offsets.topic.num.partitions after the offset topic is created breaks consumer group partition assignment 
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-2336
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2336
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8.2.1
>            Reporter: Grant Henke
>            Assignee: Grant Henke
>         Attachments: KAFKA-2336.patch
>
>
> Currently adjusting offsets.topic.num.partitions after the offset topic is created is not supported. Meaning that the number of partitions will not change once the topic has been created.
> However, changing the value in the configuration should not cause issues and instead simply be ignored. Currently this is not the case. 
> When the value of offsets.topic.num.partitions is changed after the offset topic is created the consumer group partition assignment completely changes even though the number of partitions does not change. 
> This is because _kafka.server.OffsetManager.partitionFor(group: String)_ uses the configured value and not the value of the actual topic. 



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