CDH报错未检测到Java JDK

##报错信息
General Error(s) 主机上未检测到 Java JDK。

##结果方式
查看agent日志
tail -f /var/log/cloudera-scm-agent/cloudera-scm-agent.log
查看运行状态
systemctl status cloudera-scm-agent
重启agent节点
systemctl status cloudera-scm-agent

##其它报错
too many open files

##解决方式
cat /etc/security/limits.conf

echo ‘root soft nofile 65535’ >> /etc/security/limits.conf
echo ‘root hard nofile 65535’ >> /etc/security/limits.conf
echo ‘* soft nofile 65535’ >> /etc/security/limits.conf
echo ‘* hard nofile 65535’ >> /etc/security/limits.conf