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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