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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 09:56:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235486#comment-13235486
] 

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

Tom, could you have the class extend the cached mapping, the way the scripted one does?

This would mean that 
# the code to manage hash tables are in there
# 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, etc -yet the same code will work for
both branches, and be a better starting point for adding refresh operations.
# those bits of the code that check for the mapping being a cached mapping won't wrap the
mapping in another cache, so making it easier to do updates &C. As you note, that bit
of {{RackResolver}} should be fixed at some point -but subclassing the cached mapper would
do this automatically.
                
> 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, 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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