Github user scwf commented on the issue:
https://github.com/apache/spark/pull/16633
refer to the maillist
>One issue left is how to decide shuffle partition number.
We can have a config of the maximum number of elements for each GlobalLimit
task to process,
then do a factorization to get a number most close to that config.
E.g. the config is 2000:
if limit=10000, 10000 = 2000 * 5, we shuffle to 5 partitions
if limit=9999, 9999 = 1111 * 9, we shuffle to 9 partitions
if limit is a prime number, we just fall back to single partition
You mean for the prime number case?
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