java 编译hadoop java文件
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Compiling hadoop java files
提问by BinaryMee
I need to compile Java Hadoop programs.
我需要编译 Java Hadoop 程序。
I have compiled and got .class files for mapper and reducer.
我已经编译并获得了映射器和减速器的 .class 文件。
But when I compile mainjava file, i keep getting this error.
但是当我编译 mainjava 文件时，我不断收到这个错误。
that is it can't point mapper and reducer class files.
那就是它不能指向 mapper 和 reducer 类文件。
How can I resolve this issue?
我该如何解决这个问题？
回答by Alper
You have to give all of your source files to javac
您必须将所有源文件都提供给 javac
Example:
例子：
javac -classpath /usr/local/hadoop/hadoop-core-1.0.4.jar -sourcepath src/ -d build/ MyMain.java MyMapper.java MyReducer.java
回答by Chong Tang
hadoop-core-${VERSION}.jar is in ${HADOOP_HOME}/share/common directory.
hadoop-core-${VERSION}.jar 位于 ${HADOOP_HOME}/share/common 目录中。
javac --classpath=${HADOOP_HOME}/share/common/hadoop-core-${HADOOP_VERSION}.jar YourClass.java
will do the work.
会做的工作。
