Starting with 72b181a2a we now clone using ssh instead of http, which requires the server's ssh key in known_hosts. As this doesn't have to be the case on CI nodes, I'd suggest to stick with http instead, as the apache repo on github is read-only anyways.
Currently all tests on builds.apache.org seem to be broken in case they are trying to clone from github using ssh.
Example: https://builds.apache.org/view/A-D/view/Cassandra/job/Cassandra-3.0-dtest/lastCompletedBuild/testReport/batch_test/TestBatch/logged_batch_compatibility_2_test/
Starting with 72b181a2a we now clone using ssh instead of http, which requires the server's ssh key in
known_hosts. As this doesn't have to be the case on CI nodes, I'd suggest to stick with http instead, as the apache repo on github is read-only anyways.