搭建hadoop环境

set_up_hadoop.sh

# set env
export HADOOP_HOME='/home/yzf/Software/hadoop-2.7.2'
export PATH=$HADOOP_HOME/bin:$PATH
export PATH=$HADOOP_HOME/sbin:$PATH
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADDOP_HDFS_HOME=$HADOOP_HOME
export HADOOP_YARN_HOME=$HADOOP_HOME
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

# set JAVA_HOME in etc/hadoop/hadoop-env.sh
export JAVA_HOME=/opt/jdk1.8.0_91

# core-site.xml, add between <configuration></configuration>
<property>
   <name>fs.default.name</name>
   <value>hdfs://localhost:9000</value>
</property>

# yarn-site.xml
<property>
   <name>yarn.nodemanager.aux-services</name>
   <value>mapreduce_shuffle</value>
</property>
<property>
   <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
   <value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>

# mapred-site.xml
<property>
   <name>mapreduce.framework.name</name>
   <value>yarn</value>
</property>

# configure HDFS
mkdir -p data/hdfs/namenode
mkdir -p data/hdfs/datanode

# hdfs-site.xml
<property>
   <name>dfs.replication</name>
   <value>1</value>
 </property>
 <property>
   <name>dfs.namenode.name.dir</name>
   <value>file:/home/hadoopuser/mydata/hdfs/namenode</value>
 </property>
 <property>
   <name>dfs.datanode.data.dir</name>
   <value>file:/home/hadoopuser/mydata/hdfs/datanode</value>
 </property>
 
 # format HDFS
 hdfs namenode -format
 
 # start hadoop
 start-dfs.sh
 start-yarn.sh