hadoop - 如何使用与客户端进程不同的所有者创建 HDFS 文件

Question

HDFS Administrator Guide州

"When a file or directory is created, its owner is the user identity of the client process, and its group is the group of the parent directory (the BSD rule)."

此规则有任何异常(exception)吗？以用户“clientA”身份运行进程是否有任何方法可以创建具有不同所有者的文件？

我正在使用 hadoop.security.authentication=simple 运行。看来我可以调用setOwner事后，这是一个完全有效的后备解决方案。

Answer 1

它看起来很正常吗？？

public static void main(String[] args) throws IOException, URISyntaxException, InterruptedException {
        // TODO Auto-generated method stub

        Configuration conf = new Configuration();
        conf.addResource(new Path("/hadoop/projects/hadoop-1.0.4/conf/core-site.xml"));
        conf.addResource(new Path("/hadoop/projects/hadoop-1.0.4/conf/hdfs-site.xml"));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter the directory URI...");
        String dirPath = br.readLine();
        URI uri = new URI(dirPath);
        System.out.println("Enter the user...");
        String user = br.readLine();
        FileSystem fs = FileSystem.get(uri, conf, user);
        fs.mkdirs(new Path(uri.toString()), FsPermission.getDefault());
        FSDataOutputStream fsDataOutputStream = fs.create(new Path(uri.toString()+"/file.txt"));
        fsDataOutputStream.writeBytes("This is a demo file..!!!!");
    }