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From "Tom White (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7030) new topology mapping implementations
Date Thu, 22 Mar 2012 18:28:22 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-7030:
------------------------------

    Attachment: HADOOP-7030.patch

Updated patch to use CachedDNSToSwitchMapping.

bq. on .23+ it will automatically pick up any extra features put into the base class I added.
E.g permitting providing info to callers about whether the config is multi-switch, allowing
callers to get/dump the topology map for diagnostics

As far as I can tell nothing calls these new methods. We don't normally add new methods unless
they are used.
                
> 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: 0.20.1, 0.20.2, 0.21.0
>            Reporter: Patrick Angeles
>            Assignee: Tom White
>         Attachments: HADOOP-7030-2.patch, HADOOP-7030.patch, HADOOP-7030.patch, HADOOP-7030.patch,
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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