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From "Shixiong Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4644) Implement skewed join
Date Tue, 02 Dec 2014 03:31:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230920#comment-14230920
] 

Shixiong Zhu commented on SPARK-4644:
-------------------------------------

[~pwendell] Fair enough. I'll see what I can do for `groupByKey`.

> Implement skewed join
> ---------------------
>
>                 Key: SPARK-4644
>                 URL: https://issues.apache.org/jira/browse/SPARK-4644
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Shixiong Zhu
>         Attachments: Skewed Join Design Doc.pdf
>
>
> Skewed data is not rare. For example, a book recommendation site may have several books
which are liked by most of the users. Running ALS on such skewed data will raise a OutOfMemory
error, if some book has too many users which cannot be fit into memory. To solve it, we propose
a skewed join implementation.



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