Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/2595#issuecomment-57862630
I got mixed results from testing:
On EC2 cluster with 16 nodes, on both synthetic data and the MNIST8m data,
I found this PR sped things up for large (deep) trees. For smaller trees
(depth 5 or so), it can actually slow things down. But it is probably a good
change if it optimizes for larger trees.
E.g., on MNIST8m, with 1 depth-9 tree, runtimes were:
before: 337.450041744
this PR: 74.306151717
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