mjsax edited a comment on pull request #10953:
URL: https://github.com/apache/kafka/pull/10953#issuecomment-878687476
Correct, sliding-windows were added later and never had a default grace.
Also, we deprecated `until() / maintainMs()` before we added sliding-windows
and because they do not inherit from `Windows<W>` is never added `until() /
maintainMs()` -- thus, I don't think we need to update them. Note that there is
an interplay between grace period and retention time in the old API.
However, looking into the code I am a little bit confused about
`maintainMs()` in `TimeWindows`:
```
public long maintainMs() {
return Math.max(maintainDurationMs, sizeMs + gracePeriodMs());
}
```
In contrast, `JoinWindows` used `Math.max(maintainDurationMs, size());` and
`SessionWindows` used `Math.max(maintainDurationMs, gapMs);`.
Btw: yes, I believe we need to update JoinWindows, too. However, IIRC, we
never allowed to set retention time using the new API: because for
stream-stream joins, stores are not exposed via IQ, it does not make sense to
set a larger retention time than size+grace (ie, we ignore `maintainMs()` /
`retention()` configuration anyway).
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