为提高效率，提问时请尽量提供详细背景信息，问题描述清晰可优先响应。以下信息点请尽量提供：
- 【系统版本 & kernel 版本】 CentOS Linux release 7.2.1511 3.10.0-327.el7.x86_64
- 【TiDB 版本】 3.0.2
- 【磁盘型号】 vmware虚拟机
- 【集群节点分布】 6节点， 单机单 TiKV 实例集群
- 【数据量 & region 数量 & 副本数】
- 【问题描述（我做了什么）】 按照官方文档，执行ansible-playbook bootstrap.yml初始化系统环境报错： TASK [check_system_static : Preflight check - Check if the operating system supports EPOLLEXCLUSIVE] ************************************************************************************************************************************** fatal: [192.168.237.11]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.131008”, “end”: “2019-10-11 18:30:51.057320”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:50.926312”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]} fatal: [192.168.237.12]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.149832”, “end”: “2019-10-11 18:30:51.268339”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:51.118507”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]} fatal: [192.168.237.15]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.148565”, “end”: “2019-10-11 18:30:51.340132”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:51.191567”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]} fatal: [192.168.237.13]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.124834”, “end”: “2019-10-11 18:30:51.534696”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:51.409862”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]} fatal: [192.168.237.14]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.166952”, “end”: “2019-10-11 18:30:51.548890”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:51.381938”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]} fatal: [192.168.237.16]: FAILED! => {“changed”: true, “cmd”: “/home/tidb/deploy/epollexclusive”, “delta”: “0:00:00.114845”, “end”: “2019-10-11 18:30:52.132808”, “msg”: “non-zero return code”, “rc”: 1, “start”: “2019-10-11 18:30:52.017963”, “stderr”: “”, “stderr_lines”: [], “stdout”: “epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”, “stdout_lines”: [“epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is evidence of no EPOLLEXCLUSIVE support. Not using epollex polling engine.False: epollexclusive is not available”]}
- 【关键词】 Check if the operating system supports EPOLLEXCLUSIVE