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https://issues.apache.org/jira/browse/FLINK-7684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski updated FLINK-7684:
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Issue Type: Improvement (was: New Feature)
> Avoid multiple data copies in MergingWindowSet
> ----------------------------------------------
>
> Key: FLINK-7684
> URL: https://issues.apache.org/jira/browse/FLINK-7684
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.2.0, 1.3.0, 1.2.1, 1.3.1, 1.3.2
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
>
> Currently MergingWindowSet uses ListState of tuples to persists it's mapping.
> This is inefficient because this ListState of tuples must be converted to a
> HashMap on each access.
> Furthermore, for some cases it might be inefficient to check whether mapping
> has changed before saving it on state.
> Those two issues are causing multiple data copies and constructing multiple
> Lists/Maps per each processed element, which is a reason for noticeable
> performance issues.
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