Hadoop2.4.0环境搭建常见问题解答（虚拟机，ubuntu系统）

1、如果系统为64位，无法启动启动hdfs: ./sbin/start-dfs.sh。并有以下错误：

sed: -e expression #1, char 6: unknown option to `s'
HotSpot(TM): ssh: Could not resolve hostname HotSpot(TM): Name or service not known
64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known
Java: ssh: Could not resolve hostname Java: Name or service not known
Server: ssh: Could not resolve hostname Server: Name or service not known
VM: ssh: Could not resolve hostname VM: Name or service not known

解决方法为：

vi etc/hadoop/hadoop-env.sh

加入：

exportHADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_PREFIX}/lib/native  

修改：

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

2、常用命令跟之前的2.2.0版本不同，例如：

（1）、格式化namenode

./bin/hadoop namenode -format 

（2）、查看系统状态

./bin/hadoop dfsadmin -report

3、更友好的界面：