code: public void replaceEarlyOpenedFiles(Collection<SSTableReader> toReplace, Collection<SSTableReader> replaceWith)
      {
          for (SSTableReader s : toReplace)
              assert s.openReason.equals(SSTableReader.OpenReason.EARLY);
          // note that we can replace an early opened file with a real one
          replaceReaders(toReplace, replaceWith, false);
      }
docs: Adds the early opened files to the data tracker, but does not tell compaction strategies about it
  
  note that we dont track the live size of these sstables
  @param toReplace
  @param replaceWith