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https://issues.apache.org/jira/browse/SPARK-3655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708410#comment-14708410
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Nick Xie commented on SPARK-3655:
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I wanted to add a session id to each detail record, but only way I can do that
with mapStreamByKey is to create a LinkedList of detail records and return the
lists' iterator which will take up extra memory as opposed to just modifying
the record. I ended up just creating a linkedlist of only session records. It
seems to work on my test machine. I will test it on the cluster next week.
> Support sorting of values in addition to keys (i.e. secondary sort)
> -------------------------------------------------------------------
>
> Key: SPARK-3655
> URL: https://issues.apache.org/jira/browse/SPARK-3655
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Affects Versions: 1.1.0, 1.2.0
> Reporter: koert kuipers
> Assignee: Koert Kuipers
>
> Now that spark has a sort based shuffle, can we expect a secondary sort soon?
> There are some use cases where getting a sorted iterator of values per key is
> helpful.
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