centos7在upgrade的时候显示：Delta RPMs disabled because /usr/bin/applydeltarpm not installed

前面安装信息，太多，省略

总计：113 M
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
Running transaction check
Running transaction test

Exiting on user cancel

Error:yum install failed

在网上查了一下运行如下命令

 yum provides ‘*/applydeltarpm‘
 yum install deltarpm