TASK: [Install {{ package_1 }}] ***********************************************
failed: [192.168.1.11] => {"changed": true, "rc": 1, "results": ["Loaded plugins: branch, fastestmirror, security\nLoading mirror speeds from cached hostfile\nSetting up Install Process\nExamining /tmp/example-package-release13.el5.x86_64.rpm.rpm: example-package-release13.el5.x86_64.rpm\nMarking /tmp/example-package-release13.el5.x86_64.rpm.rpm as an update to example-package-release7.el5.x86_64\nResolving Dependencies\n--> Running transaction check\n---> Package example-package.x86_64 0:1.0.1-release13.el5 set to be updated\n--> Finished Dependency Resolution\n\nDependencies Resolved\n\n================================================================================\n Package\n Arch Version Repository Size\n================================================================================\nUpdating:\n kvm-vcpu-tool\n x86_64 1.0.1-release13.el5 /example-package-release13.el5.x86_64.rpm 110 k\n\nTransaction Summary\n================================================================================\nInstall 0 Package(s)\nUpgrade 1 Package(s)\n\nTotal size: 110 k\nDownloading Packages:\n"]}
msg: There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.参考There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them，这个报错是因为以前的系统yum传输没有完成或中断，所以导致需要执行yum-complete-transaction来完成传输。不过，建议执行yum-complete-transaction --cleanup-only，这个--cleanup参数更为安全。
执行
sudo yum-complete-transaction --cleanup-only显示输出
...
Cleaning up unfinished transaction journals
Cleaning up 2015-11-12.15:10.18原来
2015-11-12日的yum安装没有正确结束导致的问题。
清理之后再执行ansible-playbook就不再报unfinished transactions remaining错误