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From renny.ko...@rubixinfotech.com
Subject Re: Question regarding FileAppender...
Date Tue, 14 Sep 2004 01:57:15 GMT

We had also added a patch to log4j in our environment, such that the log 
files are created with process IDs... using a "%P" format specifier.  This 
allows us to run multiple executables, and they will write to unique 

Renny Koshy
President & CEO

RUBIX Information Technologies, Inc.

Mike SG <mike_borsg@yahoo.com>
09/13/2004 09:38 PM
Please respond to "Log4CXX User"

        To:     Log4CXX User <log4cxx-user@logging.apache.org>
        Subject:        Re: Question regarding FileAppender...

Thanks Arnold for the information.

Curt Arnold <carnold@apache.org> wrote:
log4cxx follows log4j and log4j does not attempt to synchronize file 
I/O across multiple processes. This is addressed in Chapter 10 of "The 
complete manual log4j".

Q 10.3 Can multiple Java Virtual Machines log to the same file using 

No, there is no way for log4j to coordinate the access for a system 
resource, for example a file, between multiple JVMs....

The following FAQ describes the common method of addressing situations 
where that is necessary by using SocketAppenders and a daemon that 
receives the log requests and writes to a file: 

On Sep 10, 2004, at 3:46 PM, Mike SG wrote:

> Hi,
> I compiled successfully the log4cxx on solaris and I am trying to run 
> a small example which uses FileAppender. Our project is a multi 
> process system. So I created a small example which has 2 processes 
> writing to a file. I used the FileAppender for this. But when I see 
> the output I see that it not process safe. The output is mixed up. 
> Does this works only for threads in a single application.
> Have I done something wrong? Can I use fileappender in a multiprocess 
> application? Do I need to set something?
> What options do I have?
> Can somebody please help me on this.
> Thanks a lot,
> -Mike.
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