[log4perl-devel] indirect appenders

[Vangelis K. <ib...@ya...>]

Hi

In 
http://search.cpan.org/dist/Log-Log4perl/lib/Log/Log4perl/FAQ.pm#I_keep_getting_duplicate_log_messages!_What%27s_wrong?

there are two examples (line numbers come from FAQ.pm version 1.35):
A) 2 categories both write in the same appender (lines 759-763)
B) 2 categories each writes to separate appender (lines 817-825)

The explanation in lines 789-793 for the example A is crystal clear.

However, I don't understand how it applies to the example B. Perhaps the 
answer lies in "directly or indirectly attached appenders"? I am not 
sure I understand if one of the appenders in example B are indirect and 
why I need to set the 'Threshold' explicitly for the Screen1 appender 
(line 822)

BTW if I follow the solution with 'Threshold' it works fine, I am just 
trying to understand why :)

Regards
Vangelis Katsikaros