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https://issues.apache.org/jira/browse/BOOKKEEPER-417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470183#comment-13470183
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Ivan Kelly commented on BOOKKEEPER-417:
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Yes, when I was running some benchmarks, this really slowed down recovery time
if the number of ledgers being recovered was large (10,000+).
> Hierarchical zk underreplication manager should clean up its hierarchy when
> done to allow for fast acquisition of underreplicated entries
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-417
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-417
> Project: Bookkeeper
> Issue Type: Sub-task
> Components: bookkeeper-auto-recovery
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: 4.2.0
>
>
> As we traverse the hierarchy to find a underreplicated fragment, leaving the
> hierarchy will cause the traversal to search in many empty znodes.
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