Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/10554#discussion_r48931786 --- Diff: core/src/main/scala/org/apache/spark/api/java/JavaPairRDD.scala --- @@ -288,17 +288,18 @@ class JavaPairRDD[K, V](val rdd: RDD[(K, V)]) * immediately to the master as a Map. This will also perform the merging locally on each mapper * before sending results to a reducer, similarly to a "combiner" in MapReduce. */ - def reduceByKeyLocally(func: JFunction2[V, V, V]): java.util.Map[K, V] = --- End diff -- fwiw, i actually think spelling out java.util.Map is more clear ...
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