Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/10024#issuecomment-212793811
@davies I also have run unit tests with big number N.
How about add a config "spark.shuffle.spill.reservedMemory"? its default is
true. It does not force to spilling when its value is true. Maybe 2.1 version
the config can be deleted.
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