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https://issues.apache.org/jira/browse/LOG4J2-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14956256#comment-14956256
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Ralph Goers commented on LOG4J2-1087:
-------------------------------------
In order to reconfigure safely Log4j uses "managers" for the appenders. In some
cases the managers will span reconfigurations in order not to require
significant locking or the loss of events. In the case of the
RollingFileAppender the "key" for the manager is the filename only. So when a
reconfiguration occurs the manager is not recreated and is reused instead. The
parameters on the manager are all final, again to avoid locking and to insure
it is thread-safe.
So the only way to change the max parameter is to change the filename, let it
reconfigure, then change the filename back and change the max attribute during
one of those two updates.
> Reload of RolloverStrategy doesn't work
> ---------------------------------------
>
> Key: LOG4J2-1087
> URL: https://issues.apache.org/jira/browse/LOG4J2-1087
> Project: Log4j 2
> Issue Type: Bug
> Reporter: Benjamin Jaton
> Attachments: reload.txt
>
>
> I am using this configuration :
> {code}<?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="DEBUG" monitorInterval="2">
> <Appenders>
> <RollingFile name="RollingFile" fileName="/tmp/test/app.log"
> filePattern="/tmp/test/app.log.%i">
> <PatternLayout>
> <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
> </PatternLayout>
> <Policies>
> <SizeBasedTriggeringPolicy size="100KB"/>
> </Policies>
> <DefaultRolloverStrategy max="5"/>
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level="info" includeLocation="false">
> <AppenderRef ref="RollingFile"/>
> </Root>
> </Loggers>
> </Configuration>{code}
> I am changing the DefaultRolloverStrategy "max" attribute from 5 to 10.
> I can see the reloading take place from the StatusLogger (full log attached):
> {code}DEBUG Starting configuration
> XmlConfiguration[location=/usr/local/apps/log4j2-test.xml]
> (...)
> DEBUG Found factory method [createStrategy]: public static
> org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy
> org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy.createStrategy(java.lang.String,java.lang.String,java.lang.String,java.lang.String,org.apache.logging.log4j.core.config.Configuration).
> 2015-07-24 12:08:00,938 DEBUG Calling createStrategy on class
> org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy for
> element DefaultRolloverStrategy with params(name="10", name="null",
> name="null", name="null",
> Configuration(/usr/local/apps/log4j2-test.xml)){code}
> So log4j2 is seeing the changes, but there is still only 5 files produced
> 1->5.
> (I made sure that I was producing enough log data)
> If I change the message pattern, I see it change in the log file, but not the
> RolloverStrategy parameters.
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