Github user tgravescs commented on the issue:
https://github.com/apache/spark/pull/15297
I haven't looked through the code in detail but can you clarify the design
a bit on this, the design pretty much just says we are splitting up the fetch
of the map outputs but it doesn't say what happens then or how this really
solves the problem.
You say that instead of doing A join B you are splitting it up to do
something like A1 join B + A2 join B + â¦. An join B. Is it still just one
reduce task fetching it in separate chunks if so how does this fix the problem
or is it treating each one of those fetches as a separate partitions when
processing it?
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