Xiangrui Meng created SPARK-8695:
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Summary: TreeAggregation shouldn't be triggered for 5 partitions
Key: SPARK-8695
URL: https://issues.apache.org/jira/browse/SPARK-8695
Project: Spark
Issue Type: Improvement
Components: MLlib, Spark Core
Affects Versions: 1.5.0
Reporter: Xiangrui Meng
Assignee: Xiangrui Meng
If an RDD has 5 partitions, tree aggregation doesn't reduce the wall-clock
time. Instead, it introduces scheduling and shuffling overhead. We should
update the condition to use tree aggregation (code attached):
{code}
while (numPartitions > scale + numPartitions / scale) {
{code}
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