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格式化namenode後遇到的問題

org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join
java.io.FileNotFoundException: /dfs/nn/current/VERSION (Permission denied)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241)
    at org.apache.hadoop.hdfs
.server.common.StorageInfo.readPropertiesFile(StorageInfo.java:241)

解決方式:修改/dfs/nn/current/VERSION所對應的檔案目錄的許可權