In my opinion: - rolling is an issue - not using an OS-wide lock is an issue, because the behavior can be OS-dependant and/or FS-dependant (NFS doesn't natively support append as far as I know so it will be racy at least on NFS)
It can be possible to do a modified version of a standard appender that use a OS filelock to synchronize this, but it will surely have an impact on performance, and it should never be used directly (use a async logger or async appender before). Since it can be tricky, I'm wondering why do you need to have the same log file for several processes ? Is there a better way to address your need than sharing a common file log ? 2016-06-25 9:08 GMT+02:00 Remko Popma <remko.po...@gmail.com>: > I would suggest trying without file locking first. > > On Sat, Jun 25, 2016 at 4:01 PM, Ralph Goers <ralph.go...@dslextreme.com> > wrote: > > > In order for multiple processes to share a log file os file locking has > to > > be used, which impacts performance considerably. Furthermore, only a > > regular FileAppender can be used. You really can’t share a rolling file > > safely as both processes may try to roll the file at the same time. > > Furthermore, if one of the processes fails to specify file locking should > > be used then the file will likely get corrupted on some systems. > > > > Ralph > > > > > On Jun 24, 2016, at 11:28 PM, Jochen Wiedmann < > jochen.wiedm...@gmail.com> > > wrote: > > > > > > Hi, > > > > > > is it possible. that multiple proceses share a common log file. (The > > > processes aree command line executables, ,which will be started at > > > unpredictable times. > > > > > > Thanks, > > > > > > Jochen > > > > > > > > > -- > > > The next time you hear: "Don't reinvent the wheel!" > > > > > > > > > http://www.keystonedevelopment.co.uk/wp-content/uploads/2014/10/evolution-of-the-wheel-300x85.jpg > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org > > > For additional commands, e-mail: log4j-user-h...@logging.apache.org > > > > > > > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org > > For additional commands, e-mail: log4j-user-h...@logging.apache.org > > > > >
