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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8304) DNSToSwitchMapping should add interface to resolve individual host besides a list of host
Date Thu, 26 Apr 2012 21:10:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263145#comment-13263145
] 

Eli Collins commented on HADOOP-8304:
-------------------------------------

Good point, forgot that people override DNSToSwitchMapping. Technically DNSToSwitchMapping
is evolving (and should stay that way), but yea no sense in breaking people if we don't have
to.

Junping, how about introducing the fix in a compatible way with the List interface?
                
> DNSToSwitchMapping should add interface to resolve individual host besides a list of
host
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8304
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8304
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 1.0.0, 2.0.0
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 2.0.0
>
>         Attachments: HADOOP-8304-V2.patch, HADOOP-8304-V2.patch, HADOOP-8304.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> DNSToSwitchMapping now has only one API to resolve a host list: public List<String>
resolve(List<String> names). But the two major caller: RackResolver.resolve() and DatanodeManager.resolveNetworkLocation()
are taking single host name but have to wrapper it to an single entry ArrayList. This is not
necessary especially the host has been cached before.

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