GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/3505
[SPARK-4644][Core] Implement skewed join
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. [Design
Doc](https://issues.apache.org/jira/secure/attachment/12684140/Skewed%20Join%20Design%20Doc.pdf)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark skewed-join
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3505.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3505
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commit 80d68a2ed9979fbfd84f99a3bc34beb51ff449cd
Author: zsxwing <[email protected]>
Date: 2014-11-25T02:57:31Z
Implement skewed join
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