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From "Luca Telloli (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5189) Integration with BookKeeper logging system
Date Tue, 10 Feb 2009 11:25:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672238#action_12672238

Luca Telloli commented on HADOOP-5189:

hey Dhruba, following your suggestion I thought about having multiple logging systems in parallel
and the simplest solution I could think of is a vector of EditLogs inside FSImage. How does
it sound? 

As I imagine it, this would require a small amount of code changes, would not add too much
overhead, would allow the user to specify multiple types of logging at the same time if needed
and easily fall back to a case with a single logger. I don't see many issues for having it
working without issues, apart from some performance penalty due to the slower synchronization
process. I guess this could still be part of HADOOP-5188?

> 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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