Github user witgo commented on the issue: https://github.com/apache/spark/pull/15505 @kayousterhout Here are my thoughts: move the serialization out of the `TaskSetManager.resourceOffer` method. Split resourceOffer and serialization process, So that we can make the serialization task operation multi-threaded execution. See eb58988948341340432cf9cdde0d11842930ec57 . It can can reduce the scheduling time by three times
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