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https://issues.apache.org/jira/browse/FLINK-5572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Syinchwun Leo updated FLINK-5572:
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Description:
When using ListState in SlidingEventTimeWindow and SlidingProcessingTimeWindow,
an element may be assigned to multiple overlapped windows. It may lead to
storage consuming. for example,
window(SlidingEventTimeWindows.of(Time.seconds(10), Time.seconds(2))).apply(UDF
window function), each element is assigned to 5 windows, When the window size
is very large, it is unacceptable(size/slide is very large).
We plan to make a little optimization, and the doc is in
https://docs.google.com/document/d/1HCt1Si3YNGFwsl2H5SO0f7WD69DdBBPVJA6abd3oFWo/edit?usp=sharing
Comments?
was:
When using ListState in SlidingEventTimeWindow and SlidingProcessingTimeWindow,
an element may be assigned to multiple overlapped windows. It may lead to
storage consuming. for example,
window(SlidingEventTimeWindows.of(Time.seconds(10), Time.seconds(2))).apply(UDF
window function), each element is assigned to 5 windows, shown as the following
Fig. When the window size is very large, it is unacceptable(size/slide is very
large).
We plan to make a little optimization, and the doc is in
https://docs.google.com/document/d/1HCt1Si3YNGFwsl2H5SO0f7WD69DdBBPVJA6abd3oFWo/edit?usp=sharing
Comments?
> ListState in SlidingEventTimeWindow and SlidingProcessingTimeWindow
> optimization
> --------------------------------------------------------------------------------
>
> Key: FLINK-5572
> URL: https://issues.apache.org/jira/browse/FLINK-5572
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.2.0, 1.1.4
> Environment: CentOS 7.2
> Reporter: Syinchwun Leo
>
> When using ListState in SlidingEventTimeWindow and
> SlidingProcessingTimeWindow, an element may be assigned to multiple
> overlapped windows. It may lead to storage consuming. for example,
> window(SlidingEventTimeWindows.of(Time.seconds(10),
> Time.seconds(2))).apply(UDF window function), each element is assigned to 5
> windows, When the window size is very large, it is unacceptable(size/slide is
> very large).
> We plan to make a little optimization, and the doc is in
> https://docs.google.com/document/d/1HCt1Si3YNGFwsl2H5SO0f7WD69DdBBPVJA6abd3oFWo/edit?usp=sharing
>
> Comments?
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