GitHub user jtengyp opened a pull request:
https://github.com/apache/spark/pull/17898
Update CartesianRDD.scala
In compute, group each iterator to multiple groups, reducing repeatedly
data fetching.
## What changes were proposed in this pull request?
In compute, group each iterator to multiple groups. Thus in the second
iteration, the data with be fetched (num of data)/groupSize times, rather than
(num of data) times.
## How was this patch tested?
The existing UT.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jtengyp/spark patch-1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17898.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17898
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