public class HdfsOps {

/**
    * Public static function
    */
    public static FileSystem iniConf() {
        FileSystem fs = null;
            try {
                Configuration configuration = new Configuration();
                fs = FileSystem.get(configuration);
            } catch (Exception e) {

}
             return fs;

}

/**
    * Make dir with permission 
    */
    public static void MkdirHdfs() throws IOException {
        Path path = new Path("/data/test");
        FsPermission permission = new FsPermission(FsAction.ALL, FsAction.ALL, FsAction.ALL);    #  全部权限(777)
        boolean mkdirs = iniConf().mkdirs(path, permission);
        System.out.println(mkdirs);
    }

public static void main(String[] args) throws Exception {

MkdirHdfs();

}

}

#> hdfs dfs -ls /data

会发现/data 目录下的test目录的权限是755(drwxr-xr-x), 填坑由此而来

查看HDFS的umask

#>  hdfs getconf -confkey fs.permissions.umask-mode

打印结果是022, 缘由在此处产生(777-022=755)

1. 1.在公共方法iniConf中添加配置设置代码如下

public static FileSystem iniConf() {
    FileSystem fs = null;
    try {
        Configuration configuration = new Configuration();
        configuration.set("fs.permissions.umask-mode", "000");
        fs = FileSystem.get(configuration);
   } catch (Exception e) {
   }
   return fs;
}

1. 2. 在项目根目录下创建core-site.xml文件,配置umask,配置如下

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<configuration>
    <property>
        <name>fs.permissions.umask-mode</name>
        <value>000</value>
    </property>
</configuration>