On Sun, Sep 7, 2014 at 4:30 PM, Jeff Trawick <trawick@xxxxxxxxx> wrote:
Apache httpd on Unix doesn't use locking. The file is opened in the parent with O_APPEND.
If the writers inherit that descriptor, all is okay for "small" buffers; if a writer opens without O_APPEND, bad.
Thanks Jeff,
In my tests over the last few days it's clear that buffer is about 4K (On CentOS, anyway). I wrote tens of gigs of logs using 50 processes and never say any intermixing of the logs at all with the message < 4K. With a larger log message it was easy to trigger the mixing of logs.
