hadoop 3.x配置文件编辑

core-site.xml

    <!-- 指定HDFS中NameNode的地址 -->
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://hadoop101:8020</value>
    </property>

    <!-- 指定hadoop运行时产生文件的存储目录 -->
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/opt/module/hadoop-3.2.0/data/tmp</value>
    </property>

hdfs-site.xml

    <!-- 指定HDFS副本的数量 -->
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    <!-- 配置NameNode的web界面 -->
    <property>
        <name>dfs.namenode.http-address</name>
        <value>hadoop101:50070</value>
    </property>
    <!-- 配置secondaryNameNode -->
    <property>
        <name>dfs.namenode.secondary.http-address</name>
        <value>hadoop104:50090</value>
    </property>

yarn-site.xml

    <!-- reducer获取数据的方式 -->
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>

    <!-- 指定YARN的ResourceManager的地址 -->
    <property>
        <name>yarn.resourcemanager.hostname</name>
        <value>hadoop101</value>
    </property>
    <property>
        <name>yarn.application.classpath</name>
        <value>/opt/module/hadoop-3.2.0/etc/hadoop:/opt/module/hadoop-3.2.0/share/hadoop/common/lib/*:/opt/module/hadoop-3.2.0/share/hadoop/common/*:/opt/module/hadoop-3.2.0/share/hadoop/hdfs:/opt/module/hadoop-3.2.0/share/hadoop/hdfs/lib/*:/opt/module/hadoop-3.2.0/share/hadoop/hdfs/*:/opt/module/hadoop-3.2.0/share/hadoop/mapreduce/lib/*:/opt/module/hadoop-3.2.0/share/hadoop/mapreduce/*:/opt/module/hadoop-3.2.0/share/hadoop/yarn:/opt/module/hadoop-3.2.0/share/hadoop/yarn/lib/*:/opt/module/hadoop-3.2.0/share/hadoop/yarn/*
</value>
    </property>

hadoop-env.sh、yarn-env.sh、mapred-env.sh
配置JAVA_HOME路径：

export JAVA_HOME=/opt/module/jdk1.8.0_201