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https://issues.apache.org/jira/browse/STORM-886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhuo Liu updated STORM-886:
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    Attachment: an simple example for backpressure.png

> Automatic Back Pressure
> -----------------------
>
>                 Key: STORM-886
>                 URL: https://issues.apache.org/jira/browse/STORM-886
>             Project: Apache Storm
>          Issue Type: Improvement
>            Reporter: Robert Joseph Evans
>            Assignee: Zhuo Liu
>         Attachments: an simple example for backpressure.png, backpressure.png
>
>
> Heron proposed a form of back pressure that  does not rely on acking or max 
> spout pending.  Instead spouts throttle not only when max.spout.pending is 
> hit, but also if any bolt has gone over a high water mark in their input 
> queue, and has not yet gone below a low water mark again.  There is a lot of 
> room for potential improvement here around control theory and having spouts 
> only respond to downstream bolts backing up, but a simple bang-bang 
> controller like this is a great start.



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