hadoop note

#JAVA_HOME
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/jre
export PATH=$PATH:$JAVA_HOME/bin

#HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-2.10.0
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

https://hadoop.apache.org/docs/r2.10.0/hadoop-project-dist/hadoop-common/SingleCluster.html

# set to the root of your Java installation
  export JAVA_HOME=/usr/java/latest

$ bin/hadoop

  $ mkdir input
  $ cp etc/hadoop/*.xml input
  $ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.10.0.jar grep input output ‘dfs[a-z.]+‘
  $ cat output/*

etc/hadoop/core-site.xml:

etc/hadoop/hdfs-site.xml:

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>

hadoop note

原文：https://www.cnblogs.com/yaoweilei/p/12798222.html