hadoop之mapreduse在Eclipse下的调试环境篇
搭建完成环境后，开始调试mapreduse程序。但是遇到不停的报错。本人很讨厌在自己的操作系统环境变量里设置来设置去，包括linux也是。通常喜欢把环境变量设置在启动程序的脚本中，让脚本自己运行的环境中有合适的环境变量即可。在Eclipse里，我预计需要设置ha
搭建完成环境后，开始调试mapreduse程序。但是遇到不停的报错。本人很讨厌在自己的操作系统环境变量里设置来设置去，包括linux也是。通常喜欢把环境变量设置在启动程序的脚本中，让脚本自己运行的环境中有合适的环境变量值即可。在Eclipse里，我预计需要设置hadoop_home变量的值，设置后，不管怎么调试。都报错：
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z
百度了一下，很多人遇到这类问题。是windows的hadoop安装目录下，bin目录中缺少hadoop.dll和winutils.exe等动态库。不过我在之前的环节已经放了这些文件，可是还是不成功。经过数天的查找，最后发现，hadoop的常规安装过程中，还要增加bin目录到path路径。于是在Eclipse调试环境中，加上path的设置。调试顺利通过。
不多说，注意看图：
选择Debug配置项，设置环境参数。
OK进入调试一切正常。
这样做过之后，如果要打包发布程序，最好记得在脚本里配置上述环境变量，否则各种异常奇葩错误像你袭来！！
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