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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2012/07/07 00:08:35 UTC

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

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

Josh Wills reassigned CRUNCH-3:
-------------------------------

    Assignee: Gabriel Reid
    
> 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
>
> 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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