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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4963) Improve multihoming support in namenode
Date Tue, 06 Aug 2013 04:39:56 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-4963:
--------------------------------

    Issue Type: Improvement  (was: Bug)
    
> Improve multihoming support in namenode
> ---------------------------------------
>
>                 Key: HDFS-4963
>                 URL: https://issues.apache.org/jira/browse/HDFS-4963
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 1.3.0
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-4963.branch-1.001.patch, HDFS-4963.branch-1.002.patch, HDFS-4963.branch-1.patch
>
>
> 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 serious problems. To avoid affecting
existing users a new config setting may be introduced.

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