[jira] [Created] (HDFS-4963) Improve multihoming support in namenode

["Arpit Agarwal (JIRA)" <ji...@apache.org>]

Arpit Agarwal created HDFS-4963:
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             Summary: Improve multihoming support in namenode
                 Key: HDFS-4963
                 URL: https://issues.apache.org/jira/browse/HDFS-4963
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 1.3.0
            Reporter: Arpit Agarwal
            Assignee: Arpit Agarwal


HDFS does not work very well on multi-homed machines. A few open Jiras refer to this:
# HDFS-1379
# HADOOP-8198

There are multiple issues involved here and some of them can be worked around by using alternate DNS names and configuring {{slave.host.name}} on Datanodes and task trackers. 

However namenode issues cannot be worked around because it does not respect the {{fs.default.name}} configuration. e.g. {{Namenode#initialize}} performs a gratuitous reverse DNS lookup to regenerate the hostname. Similar issues exist elsewhere.

This Jira is being filed to fix some of the more egregious problems. To avoid affecting existing users a new config setting may be introduced.

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