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From "Apache Spark (JIRA)" <>
Subject [jira] [Commented] (SPARK-4644) Implement skewed join
Date Thu, 18 Jun 2015 14:43:00 GMT


Apache Spark commented on SPARK-4644:

User 'koertkuipers' has created a pull request for this issue:

> Implement skewed join
> ---------------------
>                 Key: SPARK-4644
>                 URL:
>             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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