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https://issues.apache.org/jira/browse/BOOKKEEPER-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197763#comment-13197763
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Ivan Kelly commented on BOOKKEEPER-154:
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The one thing im unclear of in the above design is that "long time" is
undefined. What is a long time in this context? If it is wall time, what
happens if the zk ensemble has its clocks completely out of sync? If it is
znode time, what is something create a lot of writes in a very short period,
and we start GCing very recent messages?
> 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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