memcached file logger should flush it's buffered logs periodically

Could be caused by buffering inside libz but on old node I'm seeing zero sized log file. And that seems to be case on all other nodes I've seen.

[root@orange-2903 log]# lsof -np 2057 | grep log
memcached 2057 couchbase mem REG 253,0 235494 1201898 /opt/couchbase/lib/memcached/file_logger.so
memcached 2057 couchbase 3w REG 253,0 0 1210879 /opt/couchbase/var/lib/couchbase/log/memcached.log.3.gz
[root@orange-2903 log]# ls -l /opt/couchbase/var/lib/couchbase/log/memcached.log.3.gz
rw-rr- 1 couchbase couchbase 0 Aug 17 18:55 /opt/couchbase/var/lib/couchbase/log/memcached.log.3.gz
[root@orange-2903 log]#

That kind of sucks