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https://issues.apache.org/jira/browse/BOOKKEEPER-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197639#comment-13197639
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Gavin Li commented on BOOKKEEPER-154:
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To recycle the old enough messages is the ideal case we want to achieve. But it
seems very complicated to implement and takes too long. Maybe we can't wait for
that. What is actually enough for us is to consume all the old message for
users that being inactive for long enough time. How long the user has been
inactive can be specified as a parameter.
Actually in this way we can have kind of size based recycle. The SE can firstly
specify a large enough inactive time, say 20 days. Then it can recycle some
space. If it's not enough, SE can run once more with smaller time to free up
more space.
> Garbage collect messages for those subscribers inactive/offline for a long
> time.
> ---------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-154
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-154
> Project: Bookkeeper
> Issue Type: New Feature
> Components: hedwig-client, hedwig-server
> Affects Versions: 4.0.0
> Reporter: Sijie Guo
>
> Currently hedwig tracks subscribers progress for garbage collecting published
> messages. If subscriber subscribe and becomes offline without unsubscribing
> for a long time, those messages published in its topic have no chance to be
> garbage collected.
> A time based garbage collection policy would be suitable for this case.
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