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From "Flavio Paiva Junqueira (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5189) Integration with BookKeeper logging system
Date Tue, 10 Feb 2009 22:21:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672429#action_12672429
] 

Flavio Paiva Junqueira commented on HADOOP-5189:
------------------------------------------------

Hi Raghu, The patch for this issue currently includes HADOOP-5188. We couldn't find a clean
way of separating the patches, but we felt it is worth discussing the issues separately. Please
feel free to suggest a different approach if there is a better way of doing it.

With respect to ordering, BookKeeper does respect the order of add calls, even if the calls
are asynchronous. That is, if the namenode adds entry x and later y, the bookkeeper client
won't acknowledge y before x to the namenode.



 

> 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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