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https://issues.apache.org/jira/browse/LOG4J2-904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362034#comment-15362034
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Ralph Goers commented on LOG4J2-904:
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I don't understand why you keep asking about use cases involving multiple
processes. The RollingFileAppender does not support that. I specifically did
not add the option for file locking to the Appender, which is the only safe way
for multiple processes to write to a file, because it is full of problems. Note
that the documentation for the RollingFileAppender clearly says file locking is
not supported.
What you are forgetting is that without file locking writes from process A and
process B can overlap and you will end up with garbage in the file. In
addition, users are going to wonder why they have multiple copies of the files
when they thought they should only have one.
So unless you really want to redesign the RollingFileAppender to use a lock
file or some other such mechanism to allow multiple processes to roll over the
file safely, I am perfectly fine with the solution Bernhard provided.
I should add that I will be implementing another enhancement to have the
RollingFileAppender only write to the "rolled over" file (the one specified via
filePattern), so file renames won't be required. This mechanism is far more
likely to be able to support multiple processes writing to the file but it will
still require some trickery to make it work correctly.
> RollingFile appender doesn't zip and create new files
> -----------------------------------------------------
>
> Key: LOG4J2-904
> URL: https://issues.apache.org/jira/browse/LOG4J2-904
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.1
> Environment: Windows 7
> Reporter: Stephen A. Weinfield
> Fix For: 2.6.2
>
>
> Using TimeBasedTriggeringPolicy, with a filePattern of
> {{f:/Log4J/$$\{date:yyyy-MM}/IIB-%d\{MM-dd-yyyy}-%i.log.zip}} and a fileName
> of f:/Log4J/IIB.log:
> on date change, directory is created but filename is not zipped. Also old
> file is not cleared out, but just appended to.
> Log4j2.xml:
> {code}
> <Configuration status = "warn" name = "Log4j2_Configuration" monitorInterval
> = "60" packages = "">
> <Appenders>
> <RollingFile name = "RollingFile" fileName = "f:/Log4J/IIB.log"
> filePattern = "f:/Log4J/$${date:yyyy-MM}/IIB-%d{MM-dd-yyyy}-%i.log.zip" >
> <PatternLayout>
> <Pattern>%d %p %c{1} %m%n%n</Pattern>
> </PatternLayout>
> <Policies>
> <TimeBasedTriggeringPolicy interval = "1" modulate = "true"/>
> </Policies>
> <DefaultRolloverStrategy fileIndex = "min" max = "7"
> compressionLevel = "5"/>
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level = "trace">
> <AppenderRef ref = "RollingFile" level = "warn"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
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