Call From master/192.168.170.128 to master:8020 failed on connection exception: java.net.ConnectExce
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在执行一个Hadoop的文件读写任务是发生这个错误：Call From master/192.168.170.128 to master:8020 failed on connection exception: java.net.ConnectException: Connection。
意思大致是无法连接到master的8020端口。该问题造成的主要原因是和Hadoop以及Linux系统的版本有关，dfs.defaultFS的默认端口号为8020，但一般 在配置core-site.xml时大家都会配成9000（具体为什么我也不知道，网上只教怎么配，没说为什么），但是在Ubuntu系统中9000端口好像不起作用。将其重新改回8020即可。
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