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Posted to issues@flink.apache.org by "nyingping (Jira)" <ji...@apache.org> on 2022/07/27 01:15:00 UTC
[jira] [Updated] (FLINK-28681) The number of windows allocated by sliding windows is inaccurate, when the window length is irregular
[ https://issues.apache.org/jira/browse/FLINK-28681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
nyingping updated FLINK-28681:
------------------------------
Description:
In assignWindows, the initial length of the list of Windows is determined by '(int) (size/slide)'.
{code:java}
List<TimeWindow> windows = new ArrayList<>((int) (size / slide)) {code}
This calculation is not accurate when the sliding window length is irregular.
For example, if the size is 10 and the slide is 3, '(int) (size/slide)' gives 3, but the final number of Windows is 4.
Although this does not affect functionality.But I think it would be better.
{code:java}
int len = (int) Math.ceil((double) size / slide);
List windows = new ArrayList<>(len); {code}
was:
In assignWindows, the initial length of the list of Windows is determined by '(int) (size/slide)'.
{code:java}
List<TimeWindow> windows = new ArrayList<>((int) (size / slide)) {code}
This calculation is not accurate when the sliding window length is irregular.
For example, if the size is 10 and the slide is 3, '(int) (size/slide)' gives 3, but the final number of Windows is 4.
Although this does not affect functionality.But I think it would be better.
{code:java}
int len = (int) Math.ceil((double) (size / slide));
List windows = new ArrayList<>(len); {code}
> The number of windows allocated by sliding windows is inaccurate, when the window length is irregular
> -----------------------------------------------------------------------------------------------------
>
> Key: FLINK-28681
> URL: https://issues.apache.org/jira/browse/FLINK-28681
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Runtime
> Affects Versions: 1.15.1
> Reporter: nyingping
> Priority: Minor
>
> In assignWindows, the initial length of the list of Windows is determined by '(int) (size/slide)'.
> {code:java}
> List<TimeWindow> windows = new ArrayList<>((int) (size / slide)) {code}
> This calculation is not accurate when the sliding window length is irregular.
> For example, if the size is 10 and the slide is 3, '(int) (size/slide)' gives 3, but the final number of Windows is 4.
>
> Although this does not affect functionality.But I think it would be better.
> {code:java}
> int len = (int) Math.ceil((double) size / slide);
> List windows = new ArrayList<>(len); {code}
>
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