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https://issues.apache.org/jira/browse/ZOOKEEPER-1016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008649#comment-13008649
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Jitendra Nath Pandey commented on ZOOKEEPER-1016:
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+1 for storing edit logs in book-keeper.
>... However, systems such as the HDFS namenode, this delay can be unacceptable.
Suppose we limit the ledger size to a few thousand transactions. How much
read throughput can Book-keeper provide? If it is only a matter of a few
seconds, it might be an acceptable delay.
HDFS-1073 is making changes such that image and edit logs will be named with
the transaction ids. Does Book-keeper support named ledgers? An API which can
give all the ledgers starting from a given transaction id would be important.
> TeaKeeper: Hot standby support using bookkeeper
> -----------------------------------------------
>
> Key: ZOOKEEPER-1016
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1016
> Project: ZooKeeper
> Issue Type: Improvement
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Priority: Minor
> Attachments: tledger.pdf
>
>
> Currently Bookkeeper provides functionality for cold backups. If the entity
> logging to bookkeeper fails, its replacement must recover the ledgers which
> had been used for backup before becoming available. This is acceptable in
> some cases, such as HBase Wals where a small delay in recovery only results
> in a small percentage of data being unavailable.
> However, systems such as the HDFS namenode, this delay can be unacceptable,
> such as cases where data is being served to customers. Secondary namenodes
> should be ready to go the instant the primary goes down.
> TeaKeeper proposes a wrapper library around Bookkeeper providing T-Junction
> like functionality for logging. It also provides for primary/secondary
> election and automated hot failover.
> HDFS namenode is primary target of this work.
> The attached design doc contains more details.
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