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[SPARK-3886] [PySpark] use AutoBatchedSerializer by default
Use AutoBatchedSerializer by default, which will choose the proper batch size based on size of serialized objects, let the size of serialized batch fall in into [64k - 640k]. In JVM, the serializer will also track the objects in batch to figure out duplicated objects, larger batch may cause OOM in JVM. Author: Davies Liu <davies.liu@gmail.com> Closes apache#2740 from davies/batchsize and squashes the following commits: 52cdb88 [Davies Liu] update docs 185f2b9 [Davies Liu] use AutoBatchedSerializer by default
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