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https://issues.apache.org/jira/browse/BEAM-2453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh resolved BEAM-2453.
-------------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
> The Java DirectRunner should exercise all parts of a CombineFn
> --------------------------------------------------------------
>
> Key: BEAM-2453
> URL: https://issues.apache.org/jira/browse/BEAM-2453
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Reporter: Thomas Groh
> Assignee: Thomas Groh
> Fix For: 2.2.0
>
>
> Specifically it should:
> Create some number of accumulators; add elements to these accumulators, merge
> the created accumulators, and extract the output.
> This can be performed by replacing the {{Combine.perKey}} composite transform
> with a multi-step combine {{CombineBundles -> GroupByKey ->
> MergeAccumulators}}
> Where {{CombineBundles}} is a {{ParDo}} which takes input {{KV<K, InputT>}}
> and produces {{KV<K, AccumT>}}, outputting in {{FinishBundle}} (this can only
> be performed if the Combine takes no side inputs or does not have merging
> windows). {{MergeAccumulators}} takes in {{KV<K, Iterable<AccumT>>}} and
> produces {{KV<K, OutputT>}} by merging all of the accumulators and extracting
> the output.
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