启动Hadoop失败
报错信息
Starting namenodes on [master]
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 [master]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
大致意思就是 root 用户不被推荐操作 hadoop
解决办法
找到hadoop安装路径下的 sbin目录中的 start-dfs.sh stop-dfs.sh文件
我这里是 /root/software/hadoop-3.3.0/sbin
在里面添加配置文件
HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
重新启动Hadoop即可。
访问Hadoop Web管理页面
http://192.168.2.128:9870/dfshealth.html#tab-overview
ip地址+端口号9870（3.x默认端口号）
启动YARN失败
报错信息
Starting namenodes on [master]
Starting datanodes
Starting secondary namenodes [master]
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
找到Hadoop安装目录下的 sbin 文件夹
我这里是 /root/software/hadoop-3.3.0/sbin
在start-dfs.sh，stop-dfs.sh （start-all.sh，stop-all.sh也可以加上）文件中加入如下参数：
HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
YARN_RESOURCEMANAGER_USER=root
YARN_NODEMANAGER_USER=root
在 start-yarn.sh，stop-yarn.sh加上：
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root
然后启动Hadoop 即可
start-dfs.sh
我这里是安装了Hbase 所以 会多出几个服务进程
Hbase 启动失败
报错信息
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/root/software/hadoop-3.3.0/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/root/software/hbase-2.2.4/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/root/software/hadoop-3.3.0/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/root/software/hbase-2.2.4/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
localhost: running zookeeper, logging to /root/software/hbase-2.2.4/bin/…/logs/hbase-root-zookeeper-master.out
localhost: stopping zookeeper.
错误原因是 Hadoop 和 Hbase 的 SLF4J Jar包冲突了。
在网上看了一堆，有说把冲突的jar移动到其他位置，在拷贝一个jar包过来，就是把Hadoop和Hbase的jar包保持版本一致。另一种就是删除jar，在从Hadoop 或者Hbase拷贝一份（自测）。
我测试过了，仍然报错。这里就不一一赘述了。
解决办法
找到HBase的安装路径下的hbase-env.sh文件，就是之前配置JAVA_HOME的那个文件。
我这里是
/root/software/hbase-2.2.4/conf
把文件末尾的 # export HBASE_DISABLE_HADOOP_CLASSPATH_LOOKUP=“true” 前面的注释删去即可。
export HBASE_DISABLE_HADOOP_CLASSPATH_LOOKUP="true"
export JAVA_HOME=/root/software/jdk1.8.0_261
然后在启动Hbase。
Web管理地址：
http://192.168.2.128:16010/
记得换成自己的IP地址
