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https://issues.apache.org/jira/browse/BEAM-260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15275128#comment-15275128
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Aljoscha Krettek commented on BEAM-260:
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I thought about this as well while working on the Flink Streaming side input
support. Could it be enough to have something like
{{WindowFn.getSideInputCleanupTime(BoundedWindow)}} that tells you when you can
GC a side input window based on the main-input watermark. This would be called
on the WindowFn of the side input, since it knows how the main-input windows
are mapped to side inputs.
> Know the getSideInputWindow upper bound so can gc side input state
> ------------------------------------------------------------------
>
> Key: BEAM-260
> URL: https://issues.apache.org/jira/browse/BEAM-260
> Project: Beam
> Issue Type: Bug
> Components: beam-model
> Reporter: Mark Shields
> Assignee: Frances Perry
>
> We currently have no static knowledge about the getSideInputWindow function,
> and runners are thus forced to hold on to all side input state / elements in
> case a future element reaches back into an earlier side input element.
> Maybe we need an upper bound on lag from current to result of
> getSideInputWindow so we can have a progressing gc horizon as we do for GKB
> window state.
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