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https://issues.apache.org/jira/browse/KAFKA-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14658909#comment-14658909
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Ashish K Singh commented on KAFKA-2406:
---------------------------------------

[~junrao], [~becket_qin] it sounds like we are delaying ISR change propagation 
to fix this issue. Quick intimation of ISR change is a good thing, I believe. 
However, what [~becket_qin] ran into is certainly an issue that needs to be 
fixed. I think the issue will surface only when there are lot of changes 
happening in system, like during rolling bounce. Such scenarios are usually 
started by admins. If we just specify a way to turn off or delay ISR 
notifications only during such operations, we will still react fast to ISR 
changes and won;t hit this issue during rolling bounce like scenarios. Thoughts?

> ISR propagation should be throttled to avoid overwhelming controller.
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-2406
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2406
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jiangjie Qin
>            Assignee: Jiangjie Qin
>            Priority: Blocker
>
> This is a follow up patch for KAFKA-1367.
> We need to throttle the ISR propagation rate to avoid flooding in controller 
> to broker traffic. This might significantly increase time of controlled 
> shutdown or cluster startup.



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