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Posted to issues@beam.apache.org by "Sam Whittle (Jira)" <ji...@apache.org> on 2020/10/27 20:17:00 UTC

[jira] [Created] (BEAM-11144) TriggerStateMachine.prefetchOnElement and other prefetch methods use incorrect state for subtriggers

Sam Whittle created BEAM-11144:
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             Summary: 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


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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