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https://issues.apache.org/jira/browse/HADOOP-5188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714929#action_12714929
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Flavio Paiva Junqueira commented on HADOOP-5188:
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Luca, I was wondering if you could clarify a few points of your last post:
# I'm not sure I follow the argument about append. More specifically, I'm not
sure if your argument is about implementation complexity or just abstraction.
To implement append with BookKeeper, can't we simply open another ledger upon a
call to append? With respect to abstraction, it sounds rights that it would be
better not to have to implement "append" for bookkeeper logging because no such
operation is supported directly by the service.
# On your argument about not fully using LogDevice, perhaps you want to
elaborate on it a little more. Why is it ok to leave it partially implemented?
I'm specially concerned about someone looking at this code later and having a
hard time understanding it because there is a mix of mechanisms implemented. If
the remainder of the abstraction can be implemented right away, then it might
be ok to postpone in the interest of progress.
# I didn't follow the correlation between the BackupNode and logging with
BookKeeper. Are you saying that if we don't have LogDevice, then we would have
to spawn a new process to perform BookKeeper logging as with the BackupNode?
Independent of the answer to this question, please clarify.
> Modifications to enable multiple types of logging
> --------------------------------------------------
>
> Key: HADOOP-5188
> URL: https://issues.apache.org/jira/browse/HADOOP-5188
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.20.0
> Reporter: Luca Telloli
> Fix For: 0.21.0
>
> Attachments: HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.patch,
> HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.patch, HADOOP-5188.pdf
>
>
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