[jira] [Updated] (BEAM-2453) The Java DirectRunner should exercise all parts of a CombineFn

["Robert Bradshaw (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-2453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Bradshaw updated BEAM-2453:
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    Summary: The Java DirectRunner should exercise all parts of a CombineFn  (was: The DirectRunner should exercise all parts of a CombineFn)

> 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
>
> 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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