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https://issues.apache.org/jira/browse/HDFS-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239791#comment-13239791
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Uma Maheswara Rao G commented on HDFS-234:
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Looks this particular issue, did not merged to HA branch ( but marked fix 
versions to HA branch also). 
It was committed only to trunk. So, 23 branch missing this code.

We have to merge this 23 branch for HA release right.( as this is also one 
option in shared storage).?

@Aaron, are we planning this issue merge to 23?
                
> Integration with BookKeeper logging system
> ------------------------------------------
>
>                 Key: HDFS-234
>                 URL: https://issues.apache.org/jira/browse/HDFS-234
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Luca Telloli
>            Assignee: Ivan Kelly
>             Fix For: HA branch (HDFS-1623), 0.24.0
>
>         Attachments: HADOOP-5189-trunk-preview.patch, 
> HADOOP-5189-trunk-preview.patch, HADOOP-5189-trunk-preview.patch, 
> HADOOP-5189-v.19.patch, HADOOP-5189.patch, HDFS-234.diff, HDFS-234.diff, 
> HDFS-234.diff, HDFS-234.diff, HDFS-234.diff, HDFS-234.patch, create.png, 
> hdfs_tpt_lat.pdf, zookeeper-dev-bookkeeper.jar, zookeeper-dev.jar
>
>
> BookKeeper is a system to reliably log streams of records 
> (https://issues.apache.org/jira/browse/ZOOKEEPER-276). The NameNode is a 
> natural target for such a system for being the metadata repository of the 
> entire file system for HDFS. 

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