You are using the EPEL 5 version of the repo instead of 6, go into your /etc/yum.repos.d/epel.repo file and change:
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-5&arch=$basearch
to
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-6&arch=$basearch
Then run
yum clean all
and then try and install again.
yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager
安装master节点：
rpm -Uvh http://mysql-master-ha.googlecode.com/files/mha4mysql-manager-0.52-0.noarch.rpm
yum update atomic-release
You have to bypass Yum by installing the latest version like this:
wget -q -O - https://www.atomicorp.com/installers/atomic | sh
完毕。