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https://issues.apache.org/jira/browse/BEAM-41?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857281#comment-15857281
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Jingsong Lee commented on BEAM-41:
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Yes, `add()` in CombiningState has no return value, so I can't override it
directly. Now `addIfAbsent()` both write and read, as you say, not just a
"blind write". MapState may has more such interfaces.
For Runners, it's a little harder to deal with SetState's readLater. Maybe we
should provide a `readLater(Set<T>)` interface to tell runner?
> State for "Set" data, supporting efficient membership checks
> ------------------------------------------------------------
>
> Key: BEAM-41
> URL: https://issues.apache.org/jira/browse/BEAM-41
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Jingsong Lee
> Priority: Minor
> Labels: State
>
> Analogous to how BagState supports efficient blind writes, a SetState would
> support efficient membership checking without reading the entire set.
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