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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2012/09/13 16:16:08 UTC

[jira] [Resolved] (CRUNCH-58) Implement PObject in Crunch/Scrunch

     [ https://issues.apache.org/jira/browse/CRUNCH-58?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Wills resolved CRUNCH-58.
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.4.0

Committed. Thanks Kiyan!
                
> Implement PObject in Crunch/Scrunch
> -----------------------------------
>
>                 Key: CRUNCH-58
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-58
>             Project: Crunch
>          Issue Type: New Feature
>    Affects Versions: 0.3.0
>            Reporter: Kiyan Ahmadizadeh
>            Assignee: Kiyan Ahmadizadeh
>             Fix For: 0.4.0
>
>         Attachments: CRUNCH-58.patch
>
>
> FlumeJava has the concept of a PObject<T>, a container for a singleton of type T.  It is meant represent the result of a distributed computation that yields a singleton value (for example max, min, and length methods on PCollection<T>).  Generally speaking, the result of any computation that combines/reduces a PCollection into a singleton value could be represented by a PObject.  
> Like PCollection, a PObject defers distributed computation until its value is actually used.  

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