Github user sryza commented on the pull request: https://github.com/apache/spark/pull/6679#issuecomment-109890835 Ah, yeah, that was the change I was referring to. I'm not sure about the Mesos deployment model, but on Standalone mode at least, it would be possible to manufacture a situation where the behavior changes. That situation is the "Example 2" outlined above. This difference relies on config files with different "client" configs being distributed to the client and to the cluster nodes. I would argue that changing behavior in this way is OK basically because the current behavior is wrong. That is, client configs should come from the client and not from the cluster.
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