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https://issues.apache.org/jira/browse/ZOOKEEPER-465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992931#comment-12992931
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Flavio Junqueira commented on ZOOKEEPER-465:
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The bookie recovery feature (ZOOKEEPER-712) is to recover ledger fragments upon
a bookie crash. Let's say your ledger is written to 4 bookies, and later bookie
number 4 crashes. To avoid having the ledger going away because of multiple
bookie failures, we have this facility that enables one to recreate the ledger
fragments of a faulty bookie.
The feature you're referring to is ledger recovery (as opposed to bookie
recovery), and it has been there for a while. Both trunk and 3.3 have it.
> Ledger size in bytes
> --------------------
>
> Key: ZOOKEEPER-465
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-465
> Project: ZooKeeper
> Issue Type: New Feature
> Components: contrib-bookkeeper
> Reporter: Flavio Junqueira
> Assignee: Flavio Junqueira
> Fix For: 3.3.3, 3.4.0
>
> Attachments: ZOOKEEPER-465.patch, ZOOKEEPER-465.patch,
> ZOOKEEPER-465.patch, ZOOKEEPER-465.patch
>
>
> It is currently easy to know how many entries a ledger has, but there is no
> easy way to know the total number of bytes in a ledger. The idea of this jira
> is to add a method that gives the number of bytes in a closed ledger. My
> current idea is to simply have the writer counting the number of bytes
> written and store it to ZooKeeper.
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