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https://issues.apache.org/jira/browse/BEAM-9624?focusedWorklogId=412793&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-412793
]
ASF GitHub Bot logged work on BEAM-9624:
----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Mar/20 02:49
Start Date: 31/Mar/20 02:49
Worklog Time Spent: 10m
Work Description: lukecwik commented on pull request #11271: [BEAM-9624]
Adds Convert to Accumulators operator for use in combiner lifting for streaming
pipelines
URL: https://github.com/apache/beam/pull/11271#discussion_r400610628
##########
File path: sdks/go/pkg/beam/core/runtime/exec/combine.go
##########
@@ -499,3 +499,30 @@ func (n *ExtractOutput) ProcessElement(ctx
context.Context, value *FullValue, va
}
return n.Out.ProcessElement(n.Combine.ctx, &FullValue{Windows:
value.Windows, Elm: value.Elm, Elm2: out, Timestamp: value.Timestamp})
}
+
+// ConvertToAccumulators is an executor for converting an input value to an
accumulator value.
+type ConvertToAccumulators struct {
+ *Combine
+}
+
+func (n *ConvertToAccumulators) String() string {
Review comment:
Please add a test like Combine/LiftedCombine:
https://github.com/apache/beam/blob/c8e200b157b43ad471c9480f8f617d9fbef33070/sdks/go/pkg/beam/core/runtime/exec/combine_test.go#L84
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Issue Time Tracking
-------------------
Worklog Id: (was: 412793)
Time Spent: 0.5h (was: 20m)
> Combine operation should support only converting to accumulators
> ----------------------------------------------------------------
>
> Key: BEAM-9624
> URL: https://issues.apache.org/jira/browse/BEAM-9624
> Project: Beam
> Issue Type: Improvement
> Components: runner-core
> Reporter: Andrew Crites
> Assignee: Andrew Crites
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> For streaming pipelines, we want to be able to lift the combiner into the
> MergeBuckets without having to also do a PartialGroupByKey before the
> shuffle. We don't want to do the PGBK since it could cause non-deterministic
> results when used with some triggers.
> We propose adding a new URN for doing just the convert to accumulators step
> and adding support for it in Java/Python/Go.
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