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https://issues.apache.org/jira/browse/BOOKKEEPER-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505739#comment-13505739
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Sijie Guo commented on BOOKKEEPER-464:
--------------------------------------
{quote}
If a bookie starts replicating a ledger fragment because it has been added to
the ensemble of ledger but it doesn't complete the replication process because,
e.g., its disk becomes full, then we remove the partially replicated ledger
fragment.
{quote}
For replication, the sequence is that 1) we picked up a bookie to replicate
entries to it, and then 2) update the ledger ensemble only after those entries
are replicated. if there are failures happened between replicating and updating
ledger ensemble, those replicated entries will become zombies (not referenced
by any ledger ensemble).
I think I wrote a comment in BOOKKEEPER-249 (
https://issues.apache.org/jira/browse/BOOKKEEPER-249?focusedCommentId=13497139&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13497139
) to discuss all the possible cases causing zombie entries (also I gave my
understanding about zombie entry in that comment).
> Provide an improved GC algorithm
> --------------------------------
>
> Key: BOOKKEEPER-464
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-464
> Project: Bookkeeper
> Issue Type: Sub-task
> Components: bookkeeper-server
> Reporter: Sijie Guo
> Assignee: Fangmin Lv
> Fix For: 4.3.0
>
> Attachments: BOOKKEEPER-464.patch
>
>
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