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

[Grant Henke (JIRA)]

Grant Henke created KAFKA-2336:
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             Summary: 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


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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