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https://issues.apache.org/jira/browse/BOOKKEEPER-237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284040#comment-13284040
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Uma Maheswara Rao G commented on BOOKKEEPER-237:
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Here is one more point to address, for example if two bookies goes from the
ensemble. Lets assume, predecessor nodes taking the action of replication.
There there will be a chance that they both may choose the same target for same
entries replication right? We have to consider target choosing also. Since they
both are working independently for replication they may not know, one guy
already choosen him for replication target for particular entries.
> Automatic recovery of under-replicated ledgers and its entries
> --------------------------------------------------------------
>
> Key: BOOKKEEPER-237
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-237
> Project: Bookkeeper
> Issue Type: New Feature
> Components: bookkeeper-client, bookkeeper-server
> Affects Versions: 4.0.0
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: Auto Recovery Detection - distributed chain
> approach.doc, Auto Recovery and Bookie sync-ups.pdf
>
>
> As per the current design of BookKeeper, if one of the BookKeeper server
> dies, there is no automatic mechanism to identify and recover the under
> replicated ledgers and its corresponding entries. This would lead to losing
> the successfully written entries, which will be a critical problem in
> sensitive systems. This document is trying to describe few proposals to
> overcome these limitations.
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