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https://issues.apache.org/jira/browse/BOOKKEEPER-607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645252#comment-13645252
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Sijie Guo commented on BOOKKEEPER-607:
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please ignore my previous comment. this fix would be pretty straightforward, 
just one line: modify the consume seq id in ActiveSubscriberState when 
#sendingFinished for a filtered out message.
                
> Filtered Messages Require ACK from Client Causes User Being Throttled 
> Incorrectly Forever
> -----------------------------------------------------------------------------------------
>
>                 Key: BOOKKEEPER-607
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-607
>             Project: Bookkeeper
>          Issue Type: Bug
>          Components: hedwig-server
>    Affects Versions: 4.2.0, 4.2.1
>            Reporter: Jiannan Wang
>            Assignee: Jiannan Wang
>            Priority: Blocker
>             Fix For: 4.3.0
>
>
> In current FIFODeliveryManager, once a message is filtered in 
> ActiveSubscriberState#messageScanned(), it just call 
> ActiveSubscriberState#sendingFinished() and wait client's acknowledgement. 
> However, the message isn't being delivered to client side, and once the 
> number of such filtered messages larger than the delivery window size, the 
> user cannot receive messages anymore!

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