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From "Vinod Kumar Vavilapalli (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3834) If multiple hosts for a split belong to the same rack, the rack is added multiple times in the AM request table
Date Wed, 08 Feb 2012 00:28:59 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated MAPREDUCE-3834:
-----------------------------------------------

    Status: Open  (was: Patch Available)

Looks good overall. Very minor nits:
 - I was confused by the test as to how the hosts all get resolved to the same rack. May be
you can comment that they resolve to the default rack.
 - when you do a racks.toArray(new String[0]), you could instead do racks.toArray(new String[racks.size()]).
The underlying code does the resizing immediately, we could as well give the correct size.
                
> If multiple hosts for a split belong to the same rack, the rack is added multiple times
in the AM request table
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3834
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3834
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>            Priority: Critical
>         Attachments: MR3834.txt
>
>
> Should be added only once - so that the RM doesn't think there's multiple rack local
requests for that particular rack.

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