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https://issues.apache.org/jira/browse/BEAM-30?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546070#comment-17546070
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Kenneth Knowles commented on BEAM-30:
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This issue has been migrated to https://github.com/apache/beam/issues/17961
> In TriggerRunner, avoid reading the set of finished subtriggers when no
> subtrigger ever finishes.
> -------------------------------------------------------------------------------------------------
>
> Key: BEAM-30
> URL: https://issues.apache.org/jira/browse/BEAM-30
> Project: Beam
> Issue Type: Improvement
> Components: runner-core
> Reporter: Kenneth Knowles
> Priority: P3
> Labels: Triggers
>
> For a trigger expression, TriggerRunner tracks which of the subexpressions
> have finished to track which subexpression is the currently active trigger
> that determines when output is permitted. For some triggers (such as the
> default trigger) this information is not needed. The reads and writes of this
> data can be elided.
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