1. hdfs-site.xml
namenode and datanode folder need to create in advance, all the content in these two folder should be deleted every time do
hadoop namenode -format
otherwise clusterID for namenode and datanode will not match
http://stackoverflow.com/questions/26907878/hadoop-multinode-cluster-data-node-not-working-properly
<configuration> <property> <name>dfs.replication</name> <value>1</value> </property> <property> <name>dfs.namenode.name.dir</name> <value>file:/home/steve/hdfs/namenode</value> </property> <property> <name>dfs.datanode.data.dir</name> <value>/home/steve/hdfs/datanode</value> </property> </configuration>
2. core-site.xml
<configuration> <property> <name>fs.default.name</name> <value>hdfs://localhost:9000</value> </property> </configuration>
3. yarn-site.xml
<configuration> <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> </configuration>
4. mapred-site.xml
<configuration> <property> <name>mapreduce.framework.name</name> <value>yarn</value> </property> </configuration>
原文：http://www.cnblogs.com/phoenix13suns/p/4464548.html