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https://issues.apache.org/jira/browse/BOOKKEEPER-196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255449#comment-13255449
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Ivan Kelly commented on BOOKKEEPER-196:
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Committed as r1327027. Thanks for reviewing Sijie.
> Define interface between bookie and ledger storage
> --------------------------------------------------
>
> Key: BOOKKEEPER-196
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-196
> Project: Bookkeeper
> Issue Type: Improvement
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: 4.1.0
>
> Attachments: BOOKKEEPER-196.diff, BOOKKEEPER-196.diff,
> BOOKKEEPER-196.diff
>
>
> EntryLogger and LedgerCache are both part of a very interdependent storage
> mechanism where entries are interleaved in a single log(EntryLogger) and
> index files are maintained (LedgerCache). I'd like to experiment with some
> other schemes (Im not convinced the interleaving is required for high
> performance). ZOOKEEPER-507 brought in these changes, but it also brought in
> a lot of other stuff, and I think its the other stuff (specifically taking
> the writing to separate files out of the critical path) which gave us the
> performance boost. To do this cleanly, we need a well defined storage
> interface for this. This JIRA is to provide this. Future work can move the
> interleaved implementation into another package as
> org.apache.bookkeeper.bookie is getting a little crowded now.
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