New York (CNN Business)Stock market volatility is back in a big way: The Dow is set for a big rally Friday after a two-day meltdown. The broader S&P 500 also looked like it would rally, with futures about 0.9 higher. News late Thursday that President Donald Trump would meet next month with Chinese leader Xi Jinping at the G-20 summit eased some of investors' fears about another trade war escalation. On Friday, China reported its exports rose nearly 15 in September, stronger than expected.