Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6684#discussion_r31869068
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala
---
@@ -179,7 +179,7 @@ abstract class GeneralizedLinearAlgorithm[M <:
GeneralizedLinearModel]
*/
def run(input: RDD[LabeledPoint]): M = {
if (numFeatures < 0) {
- numFeatures = input.map(_.features.size).first()
+ numFeatures = input.first().features.size
--- End diff --
It would only evaluate one element in this case. first() accesses the first
partition and first element of its iterator, so map should only be applied once.
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