dfa2328e28
Changes proposed: - Adding method to compute treeAggregate depth required to avoid exceeding driver max result size (first commit) - Using it in the computation of grammian of RowMatrix (second commit) Tests: - Unit Test wise, one unit test checking the behavior of the depth computation method - Tested at scale on hadoop cluster by doing PCA on a large dataset (needed depth 3 to succeed) Debatable choice: I'm not sure if RDD API is the right place to put the depth computation method. The advantage of it is that it allows to access driver max result size, and rdd number of partitions, to set default arguments for the method. Semantically, such a method might belong to something like org.apache.spark.util.Utils though. Closes #23983 from gagafunctor/Heuristic_for_treeAggregate_depth. Authored-by: Rafael Renaudin <renaudin.rafael@gmail.com> Signed-off-by: Sean Owen <sean.owen@databricks.com> |
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