Github user zuyu commented on the issue:
https://github.com/apache/incubator-quickstep/pull/230
There are several ways to get `Protobuf 3` and `gRPC` in Travis, but
unfortunately all may result in time-out.
* PR #223 upgrades git submodule in the third_party.
* PR #220 downloads `Protobuf 3` source code and builds locally.
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