public void close(C1NChunk c, int cidx, Futures fs) {
    assert _len==-1;            // Not closed
    c._vec = this;              // Attach chunk to this vec.
    DKV.put(chunkKey(cidx),c,fs); // Write updated chunk back into K/V
    long l = _nchunks-1L;
    _len = l*_chunkSize +c._len;
  }
public void close ( C1NChunk c , int cidx , Futures fs ) { assert _len == - 1 ; c . _vec = this ; DKV . put ( chunkKey ( cidx ) , c , fs ) ; long l = _nchunks - 1L ; _len = l * _chunkSize + c . _len ; }
Close, and possible replace the prior chunk with a new, larger Chunk