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https://issues.apache.org/jira/browse/HDFS-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419407#comment-13419407
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Aaron T. Myers commented on HDFS-3680:
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bq. While conceptually this jira is good idea, this is in a very critical
portion of the NN that risks dire performance impacts. I'm inclined to
think/propose other audit loggers should post-process the audit file in a
separate process.
While I understand very well the desire to not let users shoot themselves in
the performance foot, I don't think that the case of writing a custom logger
implementation is a place where users need to have their hand held. Not a ton
of folks will want to write a custom logger implementation, and those who do
should understand the potential impacts this will have on the daemons where
they're installed.
> 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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