Remove ability to specify a custom nameserver for an interface in DNS.java
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Key: HADOOP-8156
URL: https://issues.apache.org/jira/browse/HADOOP-8156
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Reporter: Eli Collins
Assignee: Eli Collins
A long time ago HADOOP-497 introduced the option to specify a specific
nameserver to use when looking up the hostname of an interface specified in the
config (eg by {{dfs.datanode.dns.interface}}). This feature is not in MR2, and
I dont't think it makes sense for HDFS since HDFS stopped advertising DNs by
hostname a long time ago (HADOOP-985). Also per HADOOP-8134 and HBASE-4109, I
don't think this feature works, as it returns the PTR record verbatim instead
of the hostname (eg PTR record may have a trailing ".", ".lan" etc that may not
resolve).
How about we remove this feature from trunk and 23? We can deprecate in 1.0,
though I doubt anyone is using it. This is an incompatible change. DNS is
annotated LimitedPrivate and Unstable but HBase uses it so will file need to
file a jira there (they use this via HBASE-1279 and HBASE-1279).
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