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https://issues.apache.org/jira/browse/HADOOP-5188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luca Telloli updated HADOOP-5188:
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Attachment: HADOOP-5188.patch
It would be good to have a better abstraction for logging. I had this need when
trying to integrate BookKeeper
(https://issues.apache.org/jira/browse/ZOOKEEPER-276) with HDFS.
My biggest problem during integration was related to the LogSync() method,
which I had to modify to take advantage of BookKeeper features. The approach I
took was to create an abstract class EditLog, incorporating most of the logic
of FSEditLog, and FSEditLog to extend it. I'm not sure this is the best
solution in the long term so any design comment is welcome. In particular, some
methods that are implemented as synchronised in the EditLog class might be used
in a non-synchronised way if using BookKeeper, so the actual synchronisation
might be left to implement by the subclass and not by the superclass.
Since after this patch multiple logging types might be available, I added an
abstract method getLogNameType() to return the name of the Logging system in
use.
== USAGE ==
Applies against hadoop-19.0 release
(http://svn.apache.org/repos/asf/hadoop/core/tags/release-0.19.0/)
> 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: 0.19.0
> Reporter: Luca Telloli
> Attachments: HADOOP-5188.patch
>
>
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