int maxChunkSize = 1024 * 1024;
                int byteLimit = 16 * 1024 * 1024;
                boolean retry = false;
                do {
                    long ooff = 0;
                    while ( ooff < size ) {
                        long wsize = size - ooff;
                        if ( wsize > byteLimit ) {
                            wsize = byteLimit;
                        }