Hadoop进程启动

• Hadoop端口：

50070   ======》namenode http port

50075  =======》datanode http port 

50090 ========》2namenode http port

8020  ========》namenode rpc port

50010 ========》datanode rpc port

• hadoop 四大模块

common   =======》普通模块

hdfs         ========》namenode+datanode+secondarynamenode

mapred

yarn        =========》resourcemanager + nodemanager

• 启动脚本

1》start-all.sh   ===>启动所有进程

2》stop-all.sh =====>关闭所有进程

3》start-dfs.sh/stop-dfs.sh =====>启动/关闭hdfs节点

4》start-yarn.sh/stop-yarn.sh =====>启动/关闭yarn节点