Hadoop问题（一）--集群群起报waring以及无法启动:

Hadoop问题（一）--集群群起报waring以及无法启动:

Hadoop问题（一）--集群群起报waring以及无法启动:

1, ERROR: Attempting to operate on hdfs namenode as root

ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.

Starting datanodes

上一次登录：三 12月  8 16:23:14 CST 2021pts/0 上

hadoop1000: datanode is running as process 5514.  Stop it first.

Starting secondary namenodes [hadoop1002]

ERROR: Attempting to operate on hdfs secondarynamenode as root

ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

这个问题主要是因为：start-dfs.sh文件配置没有添加

HDFS_DATANODE_USER=root

HDFS_DATANODE_SECURE_USER=hdfs

HDFS_NAMENODE_USER=root

HDFS_SECONDARYNAMENODE_USER=root

这四句代码或者这四句有误导致的。

其中第二句话 如果为

HADOOP_SECURE_DN_USER=hdfs 

就会报waring: : HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.

所以要把这句话改为HDFS_DATANODE_SECURE_USER=hdfs

就好了！