原因分析 查看DBService的备份页面错误信息，有如下错误信息提示： Clear temporary files at backup checkpoint DBService_test_DBService_DBService_20180326155921 that fialed last time.
Temporary files at backup checkpoint DBService_test_DBService_DBService20180326155921 that failed last time are cleared successfully. 查看/var/log/Bigdata/dbservice/scriptlog/backup.log文件，发现日志停止打印，并没有备份相关信息。 查看主
OMS 节点 /var/log/Bigdata/controller/backupplugin.log日志发现如下错误信息： result error is ssh:connect to host 172.16.4.200 port 22 : Connection refused (172.16.4.200是DBService的浮动IP)
DBService backup failed.
