[jira] Updated: (MAPREDUCE-1128) MRUnit Allows Iteration Twice

["Chris Douglas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Douglas updated MAPREDUCE-1128:
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.22.0
     Hadoop Flags: [Reviewed]
           Status: Resolved  (was: Patch Available)

I committed this. Thanks, Aaron!

> MRUnit Allows Iteration Twice
> -----------------------------
>
>                 Key: MAPREDUCE-1128
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1128
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>         Environment: Java 1.6, Hadoop 0.21.1+133 (cloudera distribution for hadoop)
>            Reporter: Ed Kohlwey
>            Assignee: Aaron Kimball
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1128.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> MRUnit allows one to iterate over a collection of values twice (ie.
> reduce(Key key, Iterable<Value> values, Context context){
>    for(Value : values ) /* iterate once */;
>    for(Value : values ) /* iterate again */;
> }
> Hadoop will allow this as well, however the second iterator will be empty. MRUnit should either match hadoop's behavior or warn the user that their code is likely flawed.

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