Change the value of dfs.namenode.datanode.registration.ip-hostname-check to true?

[ghost]

In the config file, dfs.namenode.datanode.registration.ip-hostname-check is set to false.

However, the Hadoop official document recommends to set dfs.namenode.datanode.registration.ip-hostname-check to true.
"It is recommended that this setting be left on to prevent accidental registration of datanodes listed by hostname in the excludes file during a DNS outage. Only set this to false in environments where there is no infrastructure to support reverse DNS lookup. ".

Maybe it's better to set that to true in the config file? Thanks.