Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/12980#issuecomment-217908304
Yep, I did the same question before.
The answer was Jenkins also do the clean build as you mentioned for Travis
CI. In other words, in AMP cluster, there occurs lots of maven traffic.
All CI suffers the same issue, but it's the purpose of CI.
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