Matei Zaharia created SPARK-3356:
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Summary: 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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