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https://issues.apache.org/jira/browse/KAFKA-347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554458#comment-13554458
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Maxime Brugidou commented on KAFKA-347:
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Agreed. Except you also have to think about people not using keyed
partitioning. It would be very convenient to add (maybe not remove) partitions
as your topic gets larger and you increase your cluster size. And that could be
done online since the number of partitions in this case is only used for
scaling and distribution.
(and I think the auto partition balancing is off-topic and I should probably
open another JIRA)
> change number of partitions of a topic online
> ---------------------------------------------
>
> Key: KAFKA-347
> URL: https://issues.apache.org/jira/browse/KAFKA-347
> Project: Kafka
> Issue Type: Sub-task
> Components: core
> Affects Versions: 0.8
> Reporter: Jun Rao
> Labels: features
>
> We will need an admin tool to change the number of partitions of a topic
> online.
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