title: Hadoop dfs replicate
body: <p>Sorry guys,just a simple question but I cannot find exact question on google.
  The question about what's dfs.replication mean? If I made one file named filmdata.txt in hdfs, if I set dfs.replication=1,so is it totally one file(one filmdata.txt)?or besides the main file(filmdata.txt) hadoop will create another replication file.
  shortly say:if set dfs.replication=1,there are totally one filmdata.txt,or two filmdata.txt?
  Thanks in Advance </p>