Github user guowei2 commented on the pull request:
https://github.com/apache/spark/pull/2029#issuecomment-55858585
I've run a micro benchmark in my local with 50000 records,1500 keys.
Type | OnHeapAggregate | ExternalAggregate (happens 10 spills)
------------ | ------------- | --------------
First run | 876ms | 16.9s
Stablized runs | 150ms | 15.0s
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