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Posted to common-issues@hadoop.apache.org by "Eli Collins (Updated) (JIRA)" <ji...@apache.org> on 2012/03/09 01:11:58 UTC
[jira] [Updated] (HADOOP-8156) Remove ability to specify a custom
nameserver for an interface in DNS.java
[ https://issues.apache.org/jira/browse/HADOOP-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eli Collins updated HADOOP-8156:
--------------------------------
Attachment: hadoop-8156.txt
Patch attached. Depends on HADOOP-8154 and HADOOP-7806.
> Remove ability to specify a custom nameserver for an interface in DNS.java
> --------------------------------------------------------------------------
>
> 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
> Attachments: hadoop-8156.txt
>
>
> 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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