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Posted to dev@crunch.apache.org by "Gabriel Reid (JIRA)" <ji...@apache.org> on 2012/07/07 08:00:46 UTC

[jira] [Resolved] (CRUNCH-3) Replicated ("map-side") joins

     [ https://issues.apache.org/jira/browse/CRUNCH-3?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabriel Reid resolved CRUNCH-3.
-------------------------------

    Resolution: Fixed
    
> Replicated ("map-side") joins
> -----------------------------
>
>                 Key: CRUNCH-3
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-3
>             Project: Crunch
>          Issue Type: New Feature
>          Components: MapReduce Patterns
>            Reporter: Josh Wills
>            Assignee: Gabriel Reid
>             Fix For: 0.3.0
>
>         Attachments: mapside-joins.patch
>
>
> Replicated joins are a common way to improve performance when joining a large dataset with a small one. The smaller dataset is loaded into memory in the mapper/reducer tasks, and is then joined with the larger dataset as the large one is processed by the MapReduce job itself.

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