[jira] [Created] (YARN-5404) Add the ability to split reverse zone subnets

["Shane Kumpf (JIRA)" <ji...@apache.org>]

Shane Kumpf created YARN-5404:
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             Summary: Add the ability to split reverse zone subnets
                 Key: YARN-5404
                 URL: https://issues.apache.org/jira/browse/YARN-5404
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Shane Kumpf
            Assignee: Shane Kumpf


In some environments, the entire container subnet may not be used exclusively by containers (ie the YARN nodemanager host IPs may also be part of the larger subnet). 

As a result, the reverse lookup zones created by the YARN Registry DNS server may not match those created on the forwarders.

For example:

Network: 172.27.0.0
Subnet: 255.255.248.0

Hosts:
0.27.172.in-addr.arpa
1.27.172.in-addr.arpa
2.27.172.in-addr.arpa
3.27.172.in-addr.arpa

Containers
4.27.172.in-addr.arpa
5.27.172.in-addr.arpa
6.27.172.in-addr.arpa
7.27.172.in-addr.arpa

YARN Registry DNS only allows for creating (as the total IP count is greater than 256):
27.172.in-addr.arpa

Provide configuration to further subdivide the subnets.



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