Yanbo Liang deleted SPARK-19203:

> Optimize CartesianRDD to avoid partition re-computation and re-serialization
> ----------------------------------------------------------------------------
>                 Key: SPARK-19203
>                 URL: https://issues.apache.org/jira/browse/SPARK-19203
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Weichen Xu
>            Priority: Minor
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> Current CartesianRDD implementation, suppose RDDA cartisian RDDB, generating 
> each RDDA partition will be reading by multiple RDDC partition, and RDDB has 
> similar problem.
> This will cause, when RDDC partition computing, each partition's data in RDDA 
> or RDDB will be repeatedly serialized (then transfer through network), if 
> RDDA or RDDB haven't been persist, it will cause RDD recomputation repeatedly.

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