Github user srowen commented on the pull request: https://github.com/apache/spark/pull/2508#issuecomment-56651085 @mateiz Got it. On the zip methods, I want to capture the key point from https://issues.apache.org/jira/browse/SPARK-3098 , that the ordering is not only not guaranteed but also may change on reevaluation. I hope that wording is OK to retain and merge into yours. I'll find some place in the programming guide to note this, and remove wording about persist and/or replace with suggestion to sort the RDD.
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