編譯Hadoop wordcount教程 - hadoop 2.6.3

以下是我的系統配置：windows8.1，vmware v12,2 centOS虛擬機。我在我的虛擬機上安裝了hadoop，其中一臺作爲主設備，另一臺作爲slave1。服務在兩個節點上正常運行並運行。編譯Hadoop wordcount教程 - hadoop 2.6.3

我想要編譯我的第一個MapReduce的程序，該單詞計數教程：我嘗試使用編譯如下：

[[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

，但我得到的答案是這樣的：

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，大家都說這是因爲$ CLASSPATH。

這是我的/ 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，爲什麼我得到這個錯誤？我看不出有什麼問題... :(

來源

2016-01-24 Sara azd

根據你可以做以下的文檔（我的系統上測試和工程）

export HADOOP_CLASSPATH=${JAVA_HOME}/lib/tools.jar
$HADOOP_HOME/bin/hadoop com.sun.tools.javac.Main WordCount.java 並最終創建使用
jar cf wc.jar WordCount*.class

link to the official doc here

來源

2016-01-24 12:47:28

它的工作！謝謝soooooo多！ –

編譯Hadoop wordcount教程 - hadoop 2.6.3

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