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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/06/18 16:43:01 UTC

[jira] [Assigned] (SPARK-4644) Implement skewed join

     [ https://issues.apache.org/jira/browse/SPARK-4644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-4644:
-----------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>         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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