[jira] [Updated] (BOOKKEEPER-196) Define interface between bookie and ledger storage

["Ivan Kelly (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BOOKKEEPER-196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Kelly updated BOOKKEEPER-196:
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    Attachment: BOOKKEEPER-196.diff
    
> 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
>
>
> 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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