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https://issues.apache.org/jira/browse/BOOKKEEPER-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229077#comment-13229077
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Flavio Junqueira commented on BOOKKEEPER-168:
---------------------------------------------

Although Ivan's argument sounds right to me, I also agree with Stu that a 
time-based collection can be useful in some scenarios. For example, in the case 
I tell my users that their messages will be there for at least a month. In 
fact, I believe we have considered a time-based mechanism at some point. 

If you guys think this is a useful feature, we can try to work it out perhaps 
in a separate jira. 
                
> Message bounding on subscriptions
> ---------------------------------
>
>                 Key: BOOKKEEPER-168
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-168
>             Project: Bookkeeper
>          Issue Type: New Feature
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 4.1.0
>
>         Attachments: BOOKKEEPER-168.diff, BOOKKEEPER-168.diff, 
> BOOKKEEPER-168.diff
>
>
> In hedwig, messages for a subscription will queue up forever if the 
> subscriber is offline. In some usecases, this is undesirable, as it will 
> eventually mean resource exhaustion. In this JIRA we propose an optional 
> change to the subscription contract, which allows the user to set a bound on 
> the number of messages which will be queued for its subscription while it is 
> offline.

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