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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 Tue, 08 May 2012 16:39:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270586#comment-13270586
] 

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

bq. Do you see any scenario to resolve a list of host? (not counting the unit test)

DatanodeManager does that today with a list obtained from the hosts files.

bq. I don't understand the question of last comment there as I just want to fix the interface
here

You mentioned earlier "identify a potential bug that a hostname start with number may not
been resolved properly" - doesn't that issue still need to be addressed?
                
> 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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