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https://issues.apache.org/jira/browse/BEAM-986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976014#comment-15976014
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Kenneth Knowles commented on BEAM-986:
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This is fully resolved, yes?
> ReduceFnRunner doesn't batch prefetching pane firings
> -----------------------------------------------------
>
> Key: BEAM-986
> URL: https://issues.apache.org/jira/browse/BEAM-986
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Specifically
> - in ProcessElements, if there are multiple windows to consider each is
> processed sequentially with sequential state fetches instead of a bulk
> prefetch
> - onTimer method doesn't evaluate multiple timers at a time meaning that if
> multiple timers are fired at once each is processed sequentially without
> batched prefetching
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