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https://issues.apache.org/jira/browse/HBASE-2315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400722#comment-13400722
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Jonathan Hsieh commented on HBASE-2315:
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+1 to what Jesse said. The HLog class is relatively well encapsulated. It
already has its own Reader and Writer interfaces (I'd probably ignore the FS
argument or some how hide BK specific stuff into a constructor), and a Metric
helper class. Excluding its constructors, HLog only has a few hdfs-specific
public methods (hsync, hflush, sync) and some public but static methods.
> BookKeeper for write-ahead logging
> ----------------------------------
>
> Key: HBASE-2315
> URL: https://issues.apache.org/jira/browse/HBASE-2315
> Project: HBase
> Issue Type: New Feature
> Components: regionserver
> Reporter: Flavio Junqueira
> Attachments: HBASE-2315.patch, bookkeeperOverview.pdf,
> zookeeper-dev-bookkeeper.jar
>
>
> BookKeeper, a contrib of the ZooKeeper project, is a fault tolerant and high
> throughput write-ahead logging service. This issue provides an implementation
> of write-ahead logging for hbase using BookKeeper. Apart from expected
> throughput improvements, BookKeeper also has stronger durability guarantees
> compared to the implementation currently used by hbase.
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