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https://issues.apache.org/jira/browse/HADOOP-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672825#action_12672825
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Flavio Paiva Junqueira commented on HADOOP-5189:
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Dhruba, The BookKeeper API does not restrict the application to read in a given
order. The API allows an application to request a sequence of entries x1..xn,
so if the application requests such sequences in order, it will receive entries
in order.
> Integration with BookKeeper logging system
> ------------------------------------------
>
> Key: HADOOP-5189
> URL: https://issues.apache.org/jira/browse/HADOOP-5189
> Project: Hadoop Core
> Issue Type: New Feature
> Affects Versions: 0.19.0
> Reporter: Luca Telloli
> Attachments: create.png, HADOOP-5189.patch
>
>
> 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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