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

[odunybrad]

Thanks for providing the container!
I am doing a research aiming at finding issues in configuration files. After pulling your image we notice that dfs.namenode.datanode.registration.ip-hostname-check is set to false in your hdfs-site.xml.

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.

[n0madic]

Image is designed to run tests in docker where problems with reverse name resolution are possible...

[odunybrad]

Thank you for your reply !
So do you mean it is better to set to True since "problems with reverse name resolution are possible" ?

[n0madic]

The problem is possible if set to True