How to clean the cache when i do performance test in spark

[Zhang, Liyun]

Hi all:
   When I test my spark application, I found that the second 
round(application_1481153226569_0002) is more faster than first 
round(application_1481153226569_0001).  Actually the configuration is same. I 
guess the second round is improved a lot by cache. So how can I clean the cache?




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Best Regards
Kelly Zhang/Zhang,Liyun