Github user isaias commented on the pull request: https://github.com/apache/spark/pull/2055#issuecomment-53256206 Hi @ScrapCodes, I am starting to contribute with Spark and knowing the source code/structure now, but I think that the use of Actor are limited to internal developers, so the Unhandled messages are not often sent to an Actor System, maybe if the actors were exposed to public call, unhandled messages could be more frequents. But we can change the level to Trace too. I think this log is useful for developers and shouldn't to impact the end users. But it is just a first impression, another opnion will be very useful. BR
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