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https://issues.apache.org/jira/browse/LOG4NET-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909421#action_12909421
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Julie Sheffield commented on LOG4NET-1:
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I implemented this behavior for the RemotingAppender by having it implement 
IAppenderAttachable (exactly the way ForwardingAppender implements it).  Then I 
could add the backup appender just by specifying appender-ref in 
log4net.config.  Then all I needed to do was in the catch block , before 
calling ErrorHandler.Error(message, ex), I look to see if any appenders have 
been attached and forward the LoggingEvent to them.

Of course, this approach is specific only to the RemotingAppender.  Since 
that's what I need for the project I'm working on, that's what I've tested 
extensively, but it seems like it wouldn't be hard to take a similar approach 
with other potentially error-prone appenders like ADONetAppender if it's too 
disruptive to change the entire IErrorHandler interface.

In the meantime, should I check in my changes to RemotingAppender?  Seems like 
that one is particularly susceptible to potential intermittent interruptions 
and other HA applications might need similar behavior to what I've implemented 
and tested.  Where should I upload my code so people could take a look and see 
if it's worth including?

Thanks!

> Support Fallback Appenders
> --------------------------
>
>                 Key: LOG4NET-1
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-1
>             Project: Log4net
>          Issue Type: New Feature
>          Components: Appenders, Core
>    Affects Versions: 1.2.9
>         Environment: From sourceforge
>            Reporter: Nicko Cadell
>             Fix For: v.Next
>
>
> Basically, I'm looking for the ability to set up a hierarchy of appenders so 
> that if a log to an ADONETAppender fails, log4net could then log to one of 
> more "back-up" appenders, for example, a RollingLogFile or SMTP.
> Thanks,
> Leo
> Leo J. Hart IV

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