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From Olivier Jaquemet <olivier.jaque...@jalios.com>
Subject Time and Size based rolling (using log4j companions extras)
Date Tue, 05 Jul 2011 15:28:38 GMT

I am trying to get log4j to roll log file on a timely basis (weekly), 
while also splitting log files which grow too big.
Exactly the same thing provided in logback through SizeAndTimeBasedFNATP :

In order to do that I tried 2 different approach, both fails for 
different reasons.

1. Using a TimeBasedRollingPolicy, with an added SizeBasedTriggeringPolicy
Problem: The SizeBasedTriggeringPolicy does indeed request a rollover, 
but because the filename does not change for the TimeBasedRollingPolicy, 
nothing happens (even though the rollover() method is called).

<appender name="ROLLFILE" 
<rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<param name="FileNamePattern" value="/wombat/folder/foo.%d{yyyy-MM-dd}.gz"/>
<param name="MaxFileSize" value="10240"/>

This simple approach fails because I am not using the 
TimeBasedRollingPolicy as it was conceived. I can understand that, so 
let just forget about this one and just move on to the second approach...

2. Using a FixedWindowRollingPolicy, and using a composite triggering 
policy with both a TimeBasedRollingPolicy and a SizeBasedTriggeringPolicy.

Problem : The TimeBasedRollingPolicy does not work when used as a 
TriggeringPolicy. The implementation of isTriggeringEvent(..) depends on 
a 'nextCheck' variable which is only updated through rollover() method 
(not invoked because it is not being used as the the rolling policy).
-> If TimeBasedRollingPolicy implements the TriggeringPolicy, I think it 
should support being used only this way.
Also, as a side note, it would have been nice if the 
CompositeTriggeringPolicy java was providing an XML example of the 
declaration, I add to find the commit of this class to know how to use 
it (and indicate that warnings during the XML parsing is normal, or 
better find a way to remove those warnings).

<appender name="ROLLFILE" 
<rollingPolicy class="org.apache.log4j.rolling.FixedWindowRollingPolicy">
<param name="ActiveFileName" value="/wombat/folder/foo.log"/>
<param name="FileNamePattern" value="/wombat/folder/foo.%i.log.gz"/>

<triggeringPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<param name="FileNamePattern" value="%d{yyyy-MM-dd}"/>
<param name="MaxFileSize" value="10240"/>

Is there any log4j commiter that could check my analysis and potentially 
provide a fix/workaround ?
Otherwise, is there any other way to do time+size rolling ?

Any help is really appreciated.


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