-------------------------------- file format: mar_agg_az_info2: id, rank, domain, public ip, internal ip (private ip),region, rtt, zone number note: the zone number is assigned in Alphabetical order; one exception is EC2 Asia Tokyo region. The reason is that after Jan 2012, we can not set up instances in this region's zone b. So in this region, 1--a and 3--c, there is no zone numbered as 2. rtt_cart_info.txt: rank, subdomain, public ip, internal ip (private ip),region, rtt, zone number rtt_cart_info.txt is generated by mar_agg_az_info2 because we have the mapings between public ip and subdomain.