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Invalid dfs.datanode.data.dir F:\hadoop-2.7.1\hadoop-2.7.1\etc\hadoop\data\namenode : 0: Unknown error
datanode.DataNode: Invalid dfs.datanode.data.dir F:\hadoop-2.7.1\hadoop-2.7.1\etc\hadoop\data\namenode :

0: Unknown error	at org.apache.hadoop.io.nativeio.NativeIO$POSIX.chmod(NativeIO.java:241)	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:724)	at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:502)	at org.apache.hadoop.util.DiskChecker.mkdirsWithExistsAndPermissionCheck(DiskChecker.java:140)	at org.apache.hadoop.util.DiskChecker.checkDir(DiskChecker.java:156)	at org.apache.hadoop.hdfs.server.datanode.DataNode$DataNodeDiskChecker.checkDir(DataNode.java:2344)	at org.apache.hadoop.hdfs.server.datanode.DataNode.checkStorageLocations(DataNode.java:2386)	at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2368)	at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2260)	at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2307)	at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2484)	at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2508)