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SerializedShuffleHandle is a ShuffleHandle to identify the choice of a serialized shuffle.

SerializedShuffleHandle is used to create an UnsafeShuffleWriter.

Creating Instance

SerializedShuffleHandle takes the following to be created:

SerializedShuffleHandle is created when SortShuffleManager is requested for a ShuffleHandle (for a ShuffleDependency). SortShuffleManager determines what shuffle handle to use by first checking out the requirements of BypassMergeSortShuffleHandle before SerializedShuffleHandle's.