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https://issues.apache.org/jira/browse/HBASE-2315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898424#action_12898424
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Benjamin Reed commented on HBASE-2315:
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we looked into the problem of figuring out the path to use for the WAL and 
found the following: it appears that the assumption that the WAL is stored in 
HDFS is embedded in HBase. when looking up a WAL, for example, the FileSystem 
object is used to check existence. Deletion of logs also happens outside of the 
WAL interfaces. to be truly pluggable a WAL interface should be used to 
enumerate and delete logs. have you guys thought about doing this?

> 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: bookkeeperOverview.pdf, HBASE-2315.patch, 
> 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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