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Enlarge batch size from 128 to 256 to reduce network round trip.
tikv: enlarge batch size
do we have any test on how the batch size affect the cpu/mem performance ?
@zz-jason DDL worker will get 256 rows for each time. So cache 100 rows is not suitable.
tikv: enlarge batch size (#4315)
tikv: enlarge batch size (pingcap#4315)