Upload file to HDFS using DFSClient on Java
Can't say anything about copying files with DFSClient but you can use FileSystem's methods for that purposes:
copyFromLocalFile(Path src, Path dst)- copy file from local filesystem to HDFSmoveFromLocalFile(Path src, Path dst)- move file fromlocal file system to HDFS
For example:
FileSystem fs = FileSystem.get(conf);fs.copyFromLocalFile(new Path("/home/user/test.txt"), new Path("/hadoop/test.txt"));Also you can write files via output stream:
FSDataOutputStream outStream = fs.create(new Path("/hadoop/test.txt"));outStream.write(buffer);outStream.close();Futhermore there are many useful methods for file copying between local and distributed file systems in classes FileSystem and FileUtil.