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https://issues.apache.org/jira/browse/BOOKKEEPER-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197704#comment-15197704
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ASF GitHub Bot commented on BOOKKEEPER-895:
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Github user sboobna commented on the pull request:
https://github.com/apache/bookkeeper/pull/25#issuecomment-197434490
@sijie added the apache license
> bookies should not retain ledgers which no longer belong to them
> ----------------------------------------------------------------
>
> Key: BOOKKEEPER-895
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-895
> Project: Bookkeeper
> Issue Type: Improvement
> Components: bookkeeper-server
> Affects Versions: 4.3.2
> Reporter: Siddharth Sunil Boobna
> Assignee: Siddharth Sunil Boobna
>
> The bookies do not clean up ledgers on their disk which exist in zookeeper
> but are not assigned to them by the ensemble definition. This happens if a
> bookie has a ledger, went offline, it was replicated elsewhere, and then the
> bookie comes back up. Then we have an extra copy of the same ledger.
> Solution:
> Bookie should handle this case in the garbage collector. Since we will have
> to read the ledger metadata and go through its ensemble set to determine if
> the bookie exists in the ensemble, this is an expensive operation. Thus, we
> will only run this task once every day.
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