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https://issues.apache.org/jira/browse/HDFS-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419169#comment-13419169
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Daryn Sharp commented on HDFS-3680:
-----------------------------------
I quickly scanned the patch, and agree the implementation should probably use a
chain of {{FSAccessLoggers}} instead of hardcoding log4j + one more. OTOH, I
think implementing additional loggers is fraught with peril. For instance, it
makes it too easy for someone to write a custom logger which imposes an
artificial performance penalty (like blocking on a db, instead of queueing
message for another thread to update in the db). Sub-par loggers may be
attributed as NN performance problems which may tarnish hadoop's reputation...
> Allows customized audit logging in HDFS FSNamesystem
> ----------------------------------------------------
>
> Key: HDFS-3680
> URL: https://issues.apache.org/jira/browse/HDFS-3680
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 2.0.0-alpha
> Reporter: Marcelo Vanzin
> Assignee: Marcelo Vanzin
> Priority: Minor
> Attachments: accesslogger-v1.patch, accesslogger-v2.patch
>
>
> Currently, FSNamesystem writes audit logs to a logger; that makes it easy to
> get audit logs in some log file. But it makes it kinda tricky to store audit
> logs in any other way (let's say a database), because it would require the
> code to implement a log appender (and thus know what logging system is
> actually being used underneath the façade), and parse the textual log message
> generated by FSNamesystem.
> I'm attaching a patch that introduces a cleaner interface for this use case.
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