编译Hadoop wordcount教程 - hadoop 2.6.3

以下是我的系统配置：windows8.1，vmware v12,2 centOS虚拟机。我在我的虚拟机上安装了hadoop，其中一台作为主设备，另一台作为slave1。服务在两个节点上正常运行并运行。编译Hadoop wordcount教程 - hadoop 2.6.3

我想要编译我的第一个MapReduce的程序，该单词计数教程：我尝试使用编译如下：

[[email protected] ~]$ javac -classpath $HADOOP_HOME/share/common/hadoop-common-2.6.3.jar:$HADOOP-HOME/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.6.3.jar:$HADOOP_HOME/share/common/lib/common-cli-1.2.jar -d /home/hadoop *.java

，但我得到的答案是这样的：

WordCount.java:4: error: package org.apache.hadoop.conf does not exist 
import org.apache.hadoop.conf.Configuration; 
          ^
WordCount.java:5: error: package org.apache.hadoop.fs does not exist 
import org.apache.hadoop.fs.Path; 
         ^
WordCount.java:6: error: package org.apache.hadoop.io does not exist 
import org.apache.hadoop.io.IntWritable; 
         ^
WordCount.java:7: error: package org.apache.hadoop.io does not exist 
import org.apache.hadoop.io.Text; 
         ^
WordCount.java:8: error: package org.apache.hadoop.mapreduce does not exist 
(. 
. 
.)          ^
    symbol: class Path 
    location: class WordCount 
WordCount.java:58: error: cannot find symbol 
    FileOutputFormat.setOutputPath(job, new Path(args[1])); 
    ^
    symbol: variable FileOutputFormat 
    location: class WordCount 
40 errors

我搜索了一下，大家都说这是因为$ CLASSPATH。

这是我的/ etc /的.bashrc文件：

export JAVA_HOME=/opt/jdk 
export JRE_HOME=/opt/jdk/jre 
export PATH=$PATH:/opt/jdk/bin:/opt/jdk/jre/bin 
export HADOOP_CLASSPATH=$JAVA_HOME/lib/tools.jar 
export HADOOP_HOME=/opt/hadoop/ 
export CLASSPATH=$CLASSPATH:$HADOOP_HOME/share/common/hadoop-common-2.6.3.jar:$HADOOP-HOME/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.6.3.jar:$HADOOP_HOME/share/common/lib/common-cli-1.2.jar

任何想法，为什么我得到这个错误？我看不出有什么问题... :(

来源

2016-01-24 Sara azd

根据你可以做以下的文档（我的系统上测试和工程）

export HADOOP_CLASSPATH=${JAVA_HOME}/lib/tools.jar
$HADOOP_HOME/bin/hadoop com.sun.tools.javac.Main WordCount.java 并最终创建使用
jar cf wc.jar WordCount*.class

link to the official doc here

来源

2016-01-24 12:47:28

它的工作！谢谢soooooo多！ –

编译Hadoop wordcount教程 - hadoop 2.6.3

回答

相关问题