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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