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https://issues.apache.org/jira/browse/BOOKKEEPER-250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295160#comment-13295160
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Ivan Kelly commented on BOOKKEEPER-250:
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Actually, having looked at BOOKKEEPER-259, I think it would be better to split 
MetadataManager into TopicPersistenceManager and SubscriptionDataManager, and 
then for BOOKKEEPER-259 add TopicOwnerManager.

Also, im not sure how this is all configured from hw_server.conf. Perhaps we 
don't want to provide complete pluggability at the Manager layer, as we'll be 
providing pluggability at the metastore layer anyhow.
                
> Need a ledger manager like interface to manage metadata operations in Hedwig
> ----------------------------------------------------------------------------
>
>                 Key: BOOKKEEPER-250
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-250
>             Project: Bookkeeper
>          Issue Type: Sub-task
>            Reporter: Sijie Guo
>            Assignee: Sijie Guo
>             Fix For: 4.2.0
>
>         Attachments: BOOKKEEPER-250.diff, BOOKKEEPER-250.diff, 
> BOOKKEEPER-250.diff_v2
>
>
> it would be better to a ledger-manager like interface to manage metadata 
> operations in Hedwig, which might be easy for use to adapt to meta store api.

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