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https://issues.apache.org/jira/browse/BOOKKEEPER-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228564#comment-13228564
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Ivan Kelly commented on BOOKKEEPER-168:
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Time based bounding would also be a lot more complex to implement, as it would
require a garbage collecting thread, going over each message, checking it
against the bound and if so deleting it.
The nice thing about the number based message bound is that it does the cleanup
just in time, and it allows administrators to reason about how much storage
their system will take without having to worry about tuning garbage collection.
> 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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