Aljoscha Krettek commented on BEAM-260:

The doc looks good, I'm not sure how many people will see this comment on a 
Jira issue so it might make sense to [POPOSE] it on the ML.

> 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: Kenneth Knowles
> 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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