<description> The file name for a topology file, which is used when the
net.topology.script.file.name property is set to
org.apache.hadoop.net.TableMapping. The file format is a two column text
file, with columns separated by whitespace. The first column is a DNS or
IP address and the second column specifies the rack where the address maps.
If no entry corresponding to a host in the cluster is found, then
/default-rack is assumed.
Marked property name(net.topology.script.file.name) should be