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From "Ahmed Radwan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4105) Yarn RackResolver ignores rack configurations
Date Fri, 06 Apr 2012 22:40:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249012#comment-13249012

Ahmed Radwan commented on MAPREDUCE-4105:

I see your point and agree that  ScriptBasedMapping is configurable because it has The AbstractDNSToSwitchMapping
as a superclass which implements both DNSToSwitchMapping and Configurable interfaces. 

But the RackResolver uses the DNSToSwitchMapping interface to create the new DNSToSwitchMapping:

Constructor<? extends DNSToSwitchMapping> dnsToSwitchMappingConstructor
                       = dnsToSwitchMappingClass.getConstructor();
DNSToSwitchMapping newInstance =

This is why I needed to add the setConf() method to the DNSSwitchMapping interface to just
keep using the interface instead of tying RackResolver to a specific implementation of this
interface. Alternatively I can make DNSToSwitchMapping extends Configurable (which will require
adding the getConf() method to a couple of places). What do you think?
> Yarn RackResolver ignores rack configurations
> ---------------------------------------------
>                 Key: MAPREDUCE-4105
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4105
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Ahmed Radwan
>            Assignee: Ahmed Radwan
>             Fix For: 0.23.2
>         Attachments: MAPREDUCE-4105.patch, MAPREDUCE-4105_rev2.patch
> Incorrect mappings because the Yarn RackResolver ignores rack configurations. This can
be verified by inspecting the resource manager web ui that lists all the nodes, all of them
show up with /default-rack regardless of the output from the script specified using net.topology.script.file.name
configuration property.

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