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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3680) Allows customized audit logging in HDFS FSNamesystem
Date Fri, 20 Jul 2012 14:14:35 GMT

    [ 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 fa├žade), 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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