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https://issues.apache.org/jira/browse/SPARK-10816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16647816#comment-16647816
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Jungtaek Lim commented on SPARK-10816:
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I'd add my thought about the approach 2. It would work best when the start of
session doesn't change (which enables us to find origin session and overwrite),
which is not true when watermark is enabled. This fact still requires us to
compare old sessions and new sessions, and overwrite/remove sessions properly.
> EventTime based sessionization
> ------------------------------
>
> Key: SPARK-10816
> URL: https://issues.apache.org/jira/browse/SPARK-10816
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Reporter: Reynold Xin
> Priority: Major
> Attachments: SPARK-10816 Support session window natively.pdf, Session
> Window Support For Structure Streaming.pdf
>
>
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