安装hadoop3.0版本踩坑

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安装hadoop3.0版本踩坑

1、hdfs的web页面默认端口是9870 yarn的web页面端口是8088
2、配置文件中的slaves文件没了，变成了workers文件，在里面配置datanode节点
3、在进行namenode格式化是有几个Fail，不要因此怀疑自己，只要common.Storage: Storage directory /usr/local/hadoop-3.0.2/hdfs/name has been successfully formatted. 这个提醒是存在的就没有问题
4、在启动时，start-dfs.sh start-yarn.sh时报错

Starting namenodes on [namenode]
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
Starting datanodes
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [datanode1]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
Starting resourcemanager
ERROR: Attempting to operate on yarn resourcemanager as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.
Starting nodemanagers
ERROR: Attempting to operate on yarn nodemanager as root
ERROR: but there is no YARN_NODEMANAGER_USER defined. Aborting operation.

解决办法：

注意是在文件开始空白处

在start-dfs.sh中：

HDFS_DATANODE_USER=root