if [ ! -z ${USE_REAL_DATASET} ] ; then
  echo "Using real dataset"
#  NUM_MAPS=492
  NUM_MAPS=2
  # 2TB data compressing to approx 500GB
#  COMPRESSED_DATA_BYTES=2147483648000
    COMPRESSED_DATA_BYTES=21
  # 500GB
 # UNCOMPRESSED_DATA_BYTES=536870912000
 UNCOMPRESSED_DATA_BYTES=53
fi