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Add time window and window assigner#950
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dai-chen merged 3 commits intoOct 27, 2022
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Signed-off-by: Chen Dai <daichen@amazon.com>
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Signed-off-by: Chen Dai <daichen@amazon.com>
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Signed-off-by: Chen Dai <daichen@amazon.com>
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Signed-off-by: Chen Dai daichen@amazon.com
Description
Add window and window assigner interface along with tumbling and sliding window assigner implementation. This PR is only focus on core
WindowAssignerinterface. The future tasks in #954 will integrate it and other new windowing components with query plan operator.Window
A Window is a time interval which has start timestamp and end timestamp. For convenience, the end timestamp is exclusive and thus the window boundary is actually
[startTime, endTime-1].Window Assigner
A WindowAssigner identifies which window(s) the event belong. This is the first step and foundation of handling unbounded streaming data. As follows, an event may be assigned to a single window or multiple windows according to the windowing function. Here are a few example for common windowing approach.
Tumble window is fixed size without any overlap and start timestamp is aligned by mod window size.
Sliding window is fixed size but overlapped by slide size. The algorithm is referencing https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/assigners/SlidingEventTimeWindows.java#L70
Session windowing dynamic sized and defined by a given gap duration. It is useful for event representing user activity by analyzing user behavior within a session. Note that session window may cause window merging which will be supported in future as needed.
Issues Resolved
#951
Check List
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