Github user knusbaum commented on the pull request:

    https://github.com/apache/storm/pull/874#issuecomment-155838704
  
    @HeartSaVioR 
    Yes, I remembered that the external parts I split off the storm-core build 
are dependent on the storm-core jar, so they must be done after storm-core. 
There isn't any benefit to doing the external, etc. in parallel with each other 
either, since they are so small that the startup cost overwhelms the 
parallelization benefit.
    
    The caching is still valid, but it only shaves a few seconds off.


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