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From "Marcelo Vanzin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3680) Allows customized audit logging in HDFS FSNamesystem
Date Thu, 02 Aug 2012 19:42:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427550#comment-13427550
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Marcelo Vanzin commented on HDFS-3680:
--------------------------------------

bq. Sure it is, as noted before, it buffers the NN against 3rd party code calling exit, segfaulting
in JNI, memory and fd leaks, OOM, etc. If the daemon misbehaves or blows up then it shouldn't
compromise the integrity of the namespace.

The consensus seems to be that if you can't log an audit event the NN should blow up (either
fail the request or just shut itself down entirely). So even though the daemon is in a different
address space, in that view it would still affect the functionality of the NN.
                
> 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, hdfs-3680-v3.patch,
hdfs-3680-v4.patch, hdfs-3680-v5.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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