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https://issues.apache.org/jira/browse/SPARK-3356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14144755#comment-14144755
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Apache Spark commented on SPARK-3356:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/2508
> Document when RDD elements' ordering within partitions is nondeterministic
> --------------------------------------------------------------------------
>
> Key: SPARK-3356
> URL: https://issues.apache.org/jira/browse/SPARK-3356
> Project: Spark
> Issue Type: Documentation
> Components: Documentation
> Reporter: Matei Zaharia
>
> As reported in SPARK-3098 for example, for users using zipWithIndex,
> zipWithUniqueId, etc, (and maybe even things like mapPartitions) it's
> confusing that the order of elements in each partition after a shuffle
> operation is nondeterministic (unless the operation was sortByKey). We should
> explain this in the docs for the zip and partition-wise operations.
> Another subtle issue is that the order of values for each key in groupBy /
> join / etc can be nondeterministic -- we need to explain that too.
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