Github user uncleGen commented on the pull request: https://github.com/apache/spark/pull/2679#issuecomment-59037906 @ankurdave I see. And I think it is worthy to provide a memory-based shuffle manager in some cases, like sufficient memory resources, stringent performance requirement, or a lot of reduce tasks with not very large data size. Naturally, we need to provide several implementations to choose based on [Pluggable interface for shuffles](https://issues.apache.org/jira/browse/SPARK-2044). I am doing something about this, and I need to hear your opinions.
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