Call to localhost/127.0.0.1:9001 failed on connection exception: java.net.ConnectException: Connecti
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忘记这个错误什么时候出现的了，大概是一下两种情况会出现：
1、启动eclipse的时候，DFS报错
2、运行Map/Reduce程序的时候
Cannot connect to the Map/Reduce location: hadoop2
Call to localhost/127.0.0.1:9001 failed on connection exception: java.net.ConnectException: Connection refused
解决方法：
发现自己没有启动hadoop，在运行终端上打开进入hadoop的bin安装目录下，执行:./start-all.sh，完整启动hadoop即可解决
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