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https://issues.apache.org/jira/browse/BEAM-11144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17289572#comment-17289572
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Sam Whittle commented on BEAM-11144:
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Yes, thanks!
> TriggerStateMachine.prefetchOnElement and other prefetch methods use
> incorrect state for subtriggers
> ----------------------------------------------------------------------------------------------------
>
> Key: BEAM-11144
> URL: https://issues.apache.org/jira/browse/BEAM-11144
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Fix For: 2.26.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> prefetchOnElement takes a single StateAccessor corresponding to the root
> trigger. It uses that state accessor to perform prefetches for the
> subtrigger state. However that will use the root trigger namespace for the
> tags in the subtriggers. This makes prefetching ineffective, introducing
> possibly an additional round-trip once the data is actually read.
> https://github.com/apache/beam/blob/68d6c8e6243b1d8f392840273f886276e2a8baff/runners/core-java/src/main/java/org/apache/beam/runners/core/triggers/TriggerStateMachine.java#L296
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