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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