运行命令hadoop fs -copyFromLocal ~/log hdfs://localhost/user/wrf/log后，出现Call to localhost/127.0.0.1:8020 failed on connection exception：Connection refused的错误运行命令hadoop fs -copyFromLocal ~/log hdfs://local
阅读背景：
【Hadoop】Call to localhost/127.0.0.1:8020 failed on connection exception
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