hadoop单机错误解决方法a

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在hadoop上传文件、格式化出现如下错误


1、mkdir: Call From java.net.UnknownHostException: master: master: unknown erro


2、report: Call From localhost/127.0.0.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused


3、SHUTDOWN_MSG: Shutting down DataNode at java.net.UnknownHostException: master


3 的解决方法:错误原因是由于/etc/hosts下要配置master、localhost

hadoop下的配置文件最好都用127.0.0.1不要用localhost  ,master和localhost都要配置


然后要重新格式化hadoop,开启hadoop

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