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确保被迁移的服务器(HDFS)新创建的文件夹权限是777。2.确保被迁移的服务器namenode、datanode、yarn的进程都在，迁移过程中跑map。3.同一版本迁移：bin/hadoop distcp hdfs:192.168.100.110:8020/carInfo hdfs://192.168.100.122:8020/carInfo 4.针对不同版本Hadoop迁移：bin/hadoop distcp hftp://192.168.100.110:50070/carInfo hdfs://192.168.100.122:8020/carInfo