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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7030) new topology mapping implementations
Date Thu, 22 Mar 2012 18:42:23 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235866#comment-13235866
] 

Steve Loughran commented on HADOOP-7030:
----------------------------------------

#the accessors are good for testing.
#I've been slowly putting the changes into the code, but gradually and trying to avoid any
form of problem w/existing custom topologies.

What I do want to do -and they arent a jiras, I should add them are 
* A command line entry point to take a list of hostnames, look at the current config, tell
you what they map to and list the final map. This lets you preflight check the operations.
* A way of getting the dump of the topo map in use by a service, such as through one of the
JSP pages. That way people can see what's gone wrong.

Being able to get into the map is what you need for these. 
                
> 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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