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https://issues.apache.org/jira/browse/BEAM-9624?focusedWorklogId=412700&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-412700
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ASF GitHub Bot logged work on BEAM-9624:
----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Mar/20 23:47
Start Date: 30/Mar/20 23:47
Worklog Time Spent: 10m
Work Description: acrites 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
The Convert To Accumulators operation is defined here:
https://s.apache.org/beam-runner-api-combine-model#heading=h.h5697l1scd9x
It is used by streaming pipelines where we want to lift the combiner into
the GBK, but don't want to also lift the combiner into a PGBK before the GBK.
This PGBK can behave badly with certain triggers.
This PR also adds an implementation of Convert to Accumulators for the Go,
Java, and Python SDKs.
R: @robertwb, @lukecwik, @lostluck
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 412700)
Remaining Estimate: 0h
Time Spent: 10m
> 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: 10m
> 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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