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https://issues.apache.org/jira/browse/LOG4J2-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Johle updated LOG4J2-117:
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Attachment: doubleroll.xml
File: test case XML config
> Double-rollover occuring, loosing logs
> --------------------------------------
>
> Key: LOG4J2-117
> URL: https://issues.apache.org/jira/browse/LOG4J2-117
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders, Core
> Affects Versions: 2.0-alpha2
> Environment: Java 1.6.x
> Tomcat 7.0.x
> Reporter: David Johle
> Attachments: doubleroll.xml
>
>
> I've noticed an interesting double-rollover happening, which I think is
> related to having two references to the same appender. It seems to keep
> track of the triggering events for each one separately or something.
> Backstory:
> The general setup in this case is that I have some JSP based websites running
> under Tomcat. I also have a library of utility code that they all share.
> Some of the utilities are used during the startup phase, and as a result the
> logging is a disparate mess due to different code being loaded by different
> classloaders and so on.
> My eventual solution to all this, which works well, is to have all Loggers
> managed under a single centralized configuration and under the common
> classloader, including Tomcat's logging itself. I then use a servlet filter
> on each webapp to set a value in the MDC/ThreadContext, and a Routing logger
> to send the webapp-generated log events (be it from a JSP or a shared utility
> library) to appropriate location. Anything else is just dumped in the
> central log file.
> Also, the JSP code still has several legacy components which are using old
> System.out.println() style calls that are still being replaced with proper
> logging calls via log4j. In the meantime, I still want to capture those
> events inline, so I use Tomcat's swallowOutput feature to have it intercept
> them.
> Because the System.out calls are handled by the container directly, they
> don't carry the MDC/ThreadContext key. As a result, I have to manually route
> them to the appropriate appender. Fortunately Tomcat assigns a logger name
> that is webapp specific, so I have something to identify them by.
> Behavior:
> Since I'm doing daily rolling, set system time to 11:59 PM
> Start server up
> Hit a test JSP which performs a log4j call, see entry in the webapp specific
> log file
> Hit another test JSP which performs a System.out call, see entry in the same
> webapp specific log file
> Wait for a minute so that system time is now in next day
> Hit one of the test JSP files again
> See logfile rollover happen, old file archived, and entry in the newly
> created file
> Hit that same test JSP again, entry just below previous
> (all good so far)
> Hit the other test JSP
> See logfile rollover happen again (!!), entry in the newly created file, and
> the recently-created file is archived which overwrites the properly archived
> one in the process (!!)
> (I've lost a whole day of logs, this is very bad)
> Further hits to either JSP continue in current file as they should, until the
> next day's double-rollover happens
> Attached is my (slightly simplified for readability and test case purposes)
> config file.
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