Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/3694#issuecomment-75903702
i do not think that a global default ratio is right. because in a job the
size of each stage is different and they are not Increasing or decreasing. if
we define a partition's ratio for per shuffle operation, there are no different
between setting a ration and setting partition number for per shuffle operation.
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