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From "Nicholas Wertzberger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1366) Detecting async logger overflows using a sequence number
Date Fri, 15 Apr 2016 19:13:25 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15243432#comment-15243432
] 

Nicholas Wertzberger commented on LOG4J2-1366:
----------------------------------------------

I've read up on filters, this would be another case where i would WANT the sequence number
to increment even if the log didn't go out. My goal is to know when my logs may not be fully
intact due to bursty services.

> Detecting async logger overflows using a sequence number
> --------------------------------------------------------
>
>                 Key: LOG4J2-1366
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1366
>             Project: Log4j 2
>          Issue Type: Wish
>          Components: Appenders
>    Affects Versions: 2.5
>            Reporter: Nicholas Wertzberger
>            Priority: Minor
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> I'm trying to build log drop detection into our system. It's OK to lose messages, and
I'd rather lose messages that drop service, but it's NOT OK to not know that log messages
were dropped.
> While looking around, i see that log4j2 has this concept of a sequence number in its
PatternLayout. After browsing the source code, it seems that the event has to make it all
the way to the appender doing the pattern layout to get the sequence id to increment.
> As a potential solution, I propose that this sequence id is moved to be a static member
of the AbstractLogger class, and increment on every call to log.  This would allow me to detect
dropped log messages by looking for gaps in the sequence.



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