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https://issues.apache.org/jira/browse/KAFKA-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373589#comment-16373589
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ASF GitHub Bot commented on KAFKA-4696:
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ConcurrencyPractitioner opened a new pull request #4615: [KAFKA-4696] Streams 
standby task assignment should be state-store aware
URL: https://github.com/apache/kafka/pull/4615
 
 
   

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> Streams standby task assignment should be state-store aware
> -----------------------------------------------------------
>
>                 Key: KAFKA-4696
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4696
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions: 0.10.2.0, 0.11.0.0
>            Reporter: Damian Guy
>            Priority: Major
>
> Task Assignment is currently not aware of which tasks have State Stores. This 
> can result in uneven balance of standby task assignment as all tasks are 
> assigned, but only those tasks with state-stores are ever created by 
> {{StreamThread}}. So what seems like an optimal strategy during assignment 
> time could be sub-optimal post-assignment.
> For example, lets say we have 4 tasks (2 with state-stores), 2 clients, 
> numStandbyReplicas = 1. Each client would get 2 active and 2 standby tasks.  
> One of the clients may end up with both state-store tasks, while the other 
> has none.
> Further to this, standby task configuration is currently "all or nothing". It 
> might make sense to allow more fine grained configuration, i.e., the ability 
> to specify the number of standby replicas individually for each stateful 
> operator.



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