Use the existing DomainNameResolver to leverage the pluggable resolution framework. This provides a means to perform a reverse lookup if needed. Update default implementation of DNSDomainNameResolver to protect against returning the IP address as a string from a cached value. Co-authored-by: Steve Vaughan Jr <s_vaughan@apple.com>
HDFS-4043. Namenode Kerberos Login does not use proper hostname for host qualified hdfs principal name (#4785)
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