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https://issues.apache.org/jira/browse/BOOKKEEPER-455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494472#comment-13494472
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Yixue (Andrew) Zhu commented on BOOKKEEPER-455:
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Thanks Sijie,
"I need to clarify that Hedwig actually uses async interface for add entry."
Yes, that is what I referred to as "(Hedwig uses single-queue per topic)".
After looking at code more, Flavio and your comments makes sense.
> Bookie recovery made assumption that entries are persisted in entry id order
> ----------------------------------------------------------------------------
>
> Key: BOOKKEEPER-455
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-455
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Affects Versions: 4.2.0
> Reporter: Yixue (Andrew) Zhu
> Priority: Minor
>
> The entries sent by bookkeeper client can be out of order (due to network).
> The client uses queue to track last-confirmed-entry-id correctly.
> The bookie server will happily persist the entries out of order, i.e. gaps
> are possible. If bookie crash, the recovery can cause last-confirmed-entry-id
> to be set to the last-entry persisted by bookie. The gap is not tracked nor
> detected at server side.
>
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