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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/10/29 15:06:02 UTC
[jira] [Work logged] (BEAM-11144)
TriggerStateMachine.prefetchOnElement and other prefetch methods use
incorrect state for subtriggers
[ https://issues.apache.org/jira/browse/BEAM-11144?focusedWorklogId=506239&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-506239 ]
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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