wiki:waue/2010/0115-get

從hdfs下載到local

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;


public class GetFromHdfs {
  // 將檔案從hdfs下載回local, src 為 hdfs的來源, dst 為 local 的目的端
  static boolean getFromHdfs(String src,String dst, Configuration conf) {
    Path dstPath = new Path(src);
    try {
      // 產生操作hdfs的物件
      FileSystem hdfs = dstPath.getFileSystem(conf);
      // 下載
      hdfs.copyToLocalFile(false, new Path(src),new Path(dst));
      
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }
  static public void main(String args[]){
    Configuration conf = new Configuration();
    String src = "/user/waue/input";
    String dst = "/home/waue/input";
    boolean status = getFromHdfs(src, dst, conf);
    System.err.println("create? :" + status);
    
  }
}


Last modified 11 years ago Last modified on Jan 19, 2010, 7:23:30 PM