hadoop 伪分布式配置关键点-优快云博客

配置hadoop 的环境变量（所有的环境变量都是必须的）
su
vim /etc/profile
export HADOOP_INSTALL=/usr/opt/hadoop
export PATH=${HADOOP_INSTALL}/bin:${HADOOP_INSTALL}/sbin${PATH}
export HADOOP_MAPRED_HOME=${HADOOP_INSTALL}
export HADOOP_COMMON_HOME=${HADOOP_INSTALL}
export HADOOP_HDFS_HOME=${HADOOP_INSTALL}
export YARN_HOME=${HADOOP_INSTALLL}
export HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_INSTALL}/lib/natvie

export HADOOP_OPTS="-Djava.library.path=${HADOOP_INSTALL}/lib:${HADOOP_INSTALL}/lib/native"

设置hadoop-env.sh中的java环境变量
cd /usr/opt/hadoop
vim ./etc/hadoop/hadoop-env.sh
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export JAVA_HOME= {你的java环境变量}

export HADOOP_OPTS="-Djava.library.path=$HADOOP_PREFIX/lib:$HADOOP_PREFIX/lib/native"

hadoop的配置文件主要有core-site.xml 、 hdfs-site.xml 、 yarn-site.xml 三个文件

core-site.xml

<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/opt/hadoop/tmp</value> 
</property>
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

hdfs.xml

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/usr/opt/hadoop/dfs/name</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:/usr/opt/hadoop/dfs/data</value>
</property>
<property> <！--这个属性节点是为了防止后面eclipse存在拒绝读写设置的 -->
<name>dfs.permissions</name>
<value>false</value>
</property>
</configuration>

yarn-site.xml

<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>

<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>

创建需要的文件夹

cd /usr/local/hadoop
mkdir tmp dfs dfs/name dfs/data

配置都已经完成。

6.运行
首先格式化文件系统

.bin/hdfs namenode -format
启动

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./sbin/start-dfs.sh
./sbin/start-yarn.sh