Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15612
@mridulm yeah, I'am thinking about this, A util class is to avoid polluting
the RDD class as rxin like, and the reason I change parameter
`preferredLocationsRDD` into `useFirstParentPreferredLocations` is because,
the way `preferredLocationsRDD` we need to dispose the reference to the
`preferredLocationsRDD` when the zipPartitionRDD is cleaned, it makes code
fussy. Would restricting the majorRdd to be the first RDD bring some
side-effect ? I think it is equivalent to the previous version only current
version may need user to swap the parameter orders.
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