Github user jerryshao commented on the issue:
    @viirya , this is slightly different from caching RDD. It is more like 
broadcasting, the final state is that each executor will hold the whole data of 
RDD2, the difference is that this is executor-executor sync, not 
driver-executor sync.
    I also have the similar concern. The performance can be varied by 
workloads, we'd better have some different workloads to see general 

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