[jira] [Updated] (FLINK-7684) Avoid multiple data copies in MergingWindowSet

["Piotr Nowojski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-7684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Nowojski updated FLINK-7684:
----------------------------------
    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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