Github user squito commented on the issue: https://github.com/apache/spark/pull/15505 @witgo -- right, I'm saying that we should make local mode work to make debugging & development as easy as possible, not to maximize performance. That means we *should* do the extra serialization in local mode, to mimic the behavior of running on a cluster. It doesn't look like task serialization still happens in local mode to me. Tasks only get serialized inside `TaskDescription.encode`, but that is only called by `CoarseGrainedSchedulerBackend`. Before this change, task serialization happened in [`localScheduler.reviveOffers`](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/local/LocalSchedulerBackend.scala#L85), because it happened inside the `TaskSchedulerImpl`.
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