Observed with CASTOR @ CERN and discussed with @simonmichal:
By using the standard xrootd logrotation script and starting xrootd with an instance name and the fifo option as follows:
[root@host]# grep Exec !$
grep Exec /etc/systemd/system/xrootd\@.service.d/xrootd.conf
ExecStart=
ExecStart=/usr/bin/xrootd -I v4 -l /var/log/xrootd/xrootd.log -c /etc/xrd.cf.%i -k fifo -s /var/run/xrootd/xrootd-%i.pid -n %i
It may happen that at log rotation time the xrootd process does not pick up the ping message and keeps logging on the (now deleted) log:
[root@host]# lsof -p 13852 | grep var
xrootd 13852 stage cwd DIR 253,1 4096 37298201 /var/spool/xrootd/server
xrootd 13852 stage 2w REG 253,1 2199257567 46776392 /var/log/xrootd/server/xrootd.log-20180612 (deleted)
At that point, only a manual operation like echo x >> /var/log/xrootd/server/.xrootd.log unblocks the situation.
Unfortunately, we don't seem to find a way to reproduce the problem, so comments are much appreciated.
For internal reference, this is also tracked at https://its.cern.ch/jira/browse/CASTOR-5520 (behind CERN SSO)
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