Hao Yang Ang created SPARK-28854:
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Summary: Zipping iterators in mapPartitions will fail
Key: SPARK-28854
URL: https://issues.apache.org/jira/browse/SPARK-28854
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.4.3
Reporter: Hao Yang Ang
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs =>
xs.map(2*).zip(xs)).foreach(println)
warning: there was one feature warning; re-run with -feature for details
19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)
java.util.NoSuchElementException: next on empty iterator
Workaround - implement zip with mapping to tuple:
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2,
x))).collect.foreach(println)
(2,1)
(4,2)
(6,3)
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