Call to localhost/127.0.0.1:9000 failed on connection exception:java.net.ConnectException
2013-01-03 22:46
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可能到原因：
1. 没有执行 hadoop namenode -format
2. /etc/hosts文件中有 ::1 localhost6 master ，把这个注释掉
1. 没有执行 hadoop namenode -format
2. /etc/hosts文件中有 ::1 localhost6 master ，把这个注释掉
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