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From "Patrick Angeles (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7030) new topology mapping implementations
Date Fri, 12 Nov 2010 05:09:14 GMT
new topology mapping implementations
------------------------------------

                 Key: HADOOP-7030
                 URL: https://issues.apache.org/jira/browse/HADOOP-7030
             Project: Hadoop Common
          Issue Type: New Feature
    Affects Versions: 0.21.0, 0.20.2, 0.20.1
            Reporter: Patrick Angeles
         Attachments: topology.patch

The default ScriptBasedMapping implementation of DNSToSwitchMapping for determining cluster
topology has some drawbacks. Principally, it forks to an OS-specific script.

This issue proposes two new Java implementations of DNSToSwitchMapping. TableMapping reads
a two column text file that maps an IP or hostname to a rack ID. Ip4RangeMapping reads a three
column text file where each line represents a start and end IP range plus a rack ID.




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