Trading was halted across many of the Chicago Mercantile Exchange's markets on Friday. The massive exchange operator blamed a "cooling issue" at a partner's data center. The issue was resolved, and at 7:30 a.m. local time, trading of futures and options resumed. Trading across the majority of the Chicago Mercantile Exchange's markets ground to a halt for several hours after a cooling problem at one of its data centers. "Due to a cooling issue at CyrusOne data centers, our markets are currently hal ...