[ https://issues.apache.org/jira/browse/FLINK-7684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Piotr Nowojski reassigned FLINK-7684: ------------------------------------- Assignee: Piotr Nowojski Affects Version/s: 1.2.0 1.3.0 1.2.1 1.3.1 1.3.2 Component/s: Streaming > Avoid multiple data copies in MergingWindowSet > ---------------------------------------------- > > Key: FLINK-7684 > URL: https://issues.apache.org/jira/browse/FLINK-7684 > Project: Flink > Issue Type: New Feature > 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)