Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2595#issuecomment-57415215
@chouqin The performance gain is already significant. The aggregation time
reduced to 3s from ~30s in my experiment. I just want to see whether we can
optimize the `mapPartitions` block (line 529), which is orthogonal to this PR.
We use generated data (https://github.com/databricks/spark-perf) and
`mnist8m`
(http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass.html) to
test performance.
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