What are the considerations for hadoop3.x installation

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You need to configure the following hadoop_conf_dir in the environment variable

Export HADOOP_HOME=/opt/software/hadoop-3.2.1-bak

Export PATH=$PATH:$HADOOP_HOME/bin

Export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

HADOOP_CONF_DIR is mainly HADOOP_CONF_DIR, otherwise all scripts will be reported to command not found.

Add in hadoop-env.sh

Export HDFS_NAMENODE_USER= "root"

Export HDFS_DATANODE_USER= "root"

Export HDFS_SECONDARYNAMENODE_USER= "root"

Export YARN_RESOURCEMANAGER_USER= "root"

Export YARN_NODEMANAGER_USER= "root"

If you do not add it, it will cause all startup commands to fail.

When using hadoop, the script command is not to do this, sh hdfs, but. / hdfs

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