Oct 21 (Reuters) - Supply chain disruptions and labor market constraints, coupled with strong consumer demand, could keep inflation high into 2022, and the U.S. central bank may need to raise rates in the second half of the year, Atlanta Federal Reserve Bank President Raphael Bostic said on Thursday. “I was thinking late third, maybe early 4th quarter for 2022,” Bostic said in an CNBC, when asked when he had penciled in an interest rate hike. Reporting by Ann Saphir; Editing by Andrea Ricci