mysqlbinlog lastest backupfile size is 0

In centos7.3,7.4 , mariadb (10.1.28,10.1.29,10.2.11，)has the following problem:

comand like this:
/usr/bin/mysqlbinlog --raw --read-from-remote-server --stop-never --host=localhost --port=3306 --user=root --password=root --result-file=/backup/binlog/ mysql-bin.000001

lastest backupfile size is 0:

1. ll

rw-rw-r- 1 mysql mysql 441 Dec 7 09:22 mysql-bin.000076
rw-rw-r- 1 mysql mysql 3230 Dec 8 03:20 mysql-bin.000077
rw-rw-r- 1 mysql mysql 0 Dec 8 03:20 mysql-bin.000078

OTHER:
mariadb10.1.29 In Cent6.8, percona5.7,mysql5.7 in centos7.3,cent7.4 , There is no such problem