Github user yangyangyyy commented on the issue:
https://github.com/apache/spark/pull/17697
btw @srowen when I run either the current version or the patched version
of the topByKey(), I get the mappers running almost 99% of the time in kyro
serialization, do you have any ideas why ? the tasks run for 10minutes for only
a 50MB input, due to the kyro cost
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