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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5189) Integration with BookKeeper logging system
Date Tue, 10 Feb 2009 23:45:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672454#action_12672454

Raghu Angadi commented on HADOOP-5189:


Regd ordering,  I guess acks are internal to BookKeeper adapter. All NameNode needs is that
the records are read/returned in the order it wrote.

About HADOOP-5188, it not very clear if the current interface is terribly inadequate (that
does not mean it cann't be improved). Roughly, the BookKeeper adapter needs to extend 'EditLogInputStream'
and 'EditLogOutputStream'. For. e.g. 'setReadyToFlush()" might be no-op and 'flushAndSync()'
just waits for ack for the latest record (at the time of the call)... Note that NN is writing
more records in parallel even while it is waiting for flushAndSync()'. 

> 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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