Github user XuTingjun commented on the pull request:

    https://github.com/apache/spark/pull/4548#issuecomment-74040124
  
     val cachedFileName = s"${url.hashCode}${timestamp}_cache"
    
    The cache file is named with url.hashCode and timestamp. No cache file of a 
jar will be the same with it. So  it will not be called for future caller


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