[
https://issues.apache.org/jira/browse/BEAM-11144?focusedWorklogId=506239&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-506239
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ASF GitHub Bot logged work on BEAM-11144:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Oct/20 15:05
Start Date: 29/Oct/20 15:05
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #13221:
URL: https://github.com/apache/beam/pull/13221
is used for the state namespace.
Previously prefetching was fetching non-existent state, possibly adding
unnecessary fetches as well as neglecting to prefetch actual state used.
Another way to accomplish this would be to change the TriggerStateMachine
prefetch methods to take a TriggerContext instead of a raw state accessor.
This would allow for TriggerStateMachine to get the correct state for
subtriggers. That seems more inline with how the nonprefetch methods work
however that is a public interface change.
**Please** add a meaningful description for your change here
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Issue Time Tracking
-------------------
Worklog Id: (was: 506239)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 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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