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Posted to issues@spark.apache.org by "Tony Stevenson (JIRA)" <ji...@apache.org> on 2015/01/15 10:09:44 UTC
[jira] [Updated] (SPARK-3356) Document when RDD elements' ordering
within partitions is nondeterministic
[ https://issues.apache.org/jira/browse/SPARK-3356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tony Stevenson updated SPARK-3356:
----------------------------------
Assignee: Sean Owen (was: Sean Owen)
> 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
> Assignee: Sean Owen
> Fix For: 1.2.0
>
>
> 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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