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https://issues.apache.org/jira/browse/KAFKA-2336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630094#comment-14630094
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Grant Henke commented on KAFKA-2336:
------------------------------------
Updated 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, KAFKA-2336.patch,
> KAFKA-2336_2015-07-16_13:04:02.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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