tmp.writeVLong(i);
        }
        for (int i = 0; i < entries / 2; i++) {
            tmp.writeVLong(Long.MAX_VALUE - i);
        }
        BytesReference bytesArray = tmp.copyBytes();
        if (bytesArray instanceof BytesArray == false) {
            throw new AssertionError("expected BytesArray but saw [" + bytesArray.getClass() + "]");
        }
        this.streamInput = bytesArray.streamInput();

        final long bytes = new ByteSizeValue(dataMb, ByteSizeUnit.MB).getBytes();
        for (int i = 0; i < bytes / 8; i++) {
            tmp.writeLong(i);
        }
        bytesArray = tmp.copyBytes();
        if (bytesArray instanceof BytesArray == false) {
            throw new AssertionError("expected BytesArray but saw [" + bytesArray.getClass() + "]");
        }
        streamInput = bytesArray.streamInput();
    }