Changes between Initial Version and Version 1 of waue/2010/0115-get

Timestamp:

Jan 19, 2010, 7:22:51 PM (16 years ago)

Author:

waue

Comment:

--

waue/2010/0115-get

@@ +1 @@
+
+
+{{{
+#!java
+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);
+                
+        }
+}
+
+
+}}}