Apache Spark commented on SPARK-17574:

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

> Cache ShuffleExchange RDD when the exchange is reused
> -----------------------------------------------------
>                 Key: SPARK-17574
>                 URL: https://issues.apache.org/jira/browse/SPARK-17574
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Liang-Chi Hsieh
> We have the rule ReuseExchange to reuse exchange in the physical plan. 
> However, for a ShuffleExchange we still need to retrieve remote blocks again 
> when the shuffle exchange is reused. We can cache the RDD of the reused 
> ShuffleExchange to avoid transferring remote blocks again.

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