code: public boolean setReplication(Path src, short replication) throws IOException {
      boolean value = fs.setReplication(src, replication);
      if (!value)
        return false;
  
      Path checkFile = getChecksumFile(src);
      if (exists(checkFile))
        fs.setReplication(checkFile, replication);
  
      return true;
    }
docs: Set replication for an existing file.
  Implement the abstract <tt>setReplication</tt> of <tt>FileSystem</tt>
  @param src file name
  @param replication new replication
  @throws IOException
  @return true if successful;
  false if file does not exist or is a directory