PidLog specifies a file in which to record the process ID (pid) of the base server process. Some of the server support programs assume that this log is in the server root, in logs/pid.
To shut down your server, kill the base server process listed in the pid log file by using a -TERM signal. To tell your server to reread its configuration files and reopen its log files, use kill with the -HUP signal.
If the PidLog file isn’t writable by the user account that the server uses, the server does not log its process ID anywhere. The server won’t start if it can’t log the process ID.
The file is the full path name and file name where the process ID is stored.
There is no default.