Github user zeb209 commented on the pull request:
https://github.com/apache/trafficserver/pull/189#issuecomment-96041018
No, you do not have to atomically add the new key. What you can do is you
push a new key to a cluster, then you wait a few minutes, say 20, until all of
them receive the new key. Then you do a `traffic_line -x' to the boxes. There
is no such a thing called "atomically" in a ATS cluster.
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