Affects Version/s: None
Fix Version/s: None
Hadoop Flags:Incompatible change
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).
|Target Version/s||0.23.3 [ 12320059 ]|
|Assignee||Eli Collins [ eli2 ]||Eli Collins [ eli ]|