引What is HadoopWhy is hadoopHow to Use Hadoop & Tips环境：部署考虑：实施步骤：Hadoop CommandHadoop基本流程以及简单应用的开发基本流程：代码范例：Hadoop集群测试随想 引       在SIP项目设计的过程中，对于它庞大的日志在早先就考虑使用任务分解的多线程

in@lenovo:~$ su - root口令： Command 'mesg' is available in '/usr/bin/mesg'The command could not be located because '/usr/bin' is not included in the PATH environment variable.-su: mesg：找不到命令ro