[jira] [Resolved] (BEAM-801) SplittableParDo must be a pseudo-primitive, not ParDo(OldDoFn)

["Daniel Halperin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Halperin resolved BEAM-801.
----------------------------------
       Resolution: Fixed
    Fix Version/s: Not applicable

> SplittableParDo must be a pseudo-primitive, not ParDo(OldDoFn)
> --------------------------------------------------------------
>
>                 Key: BEAM-801
>                 URL: https://issues.apache.org/jira/browse/BEAM-801
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core, runner-direct
>            Reporter: Kenneth Knowles
>            Assignee: Eugene Kirpichov
>             Fix For: Not applicable
>
>
> Today, runners-core contains an expansion of {{ParDo(DoFn)}} that implements it via unsupported features of {{ParDo(OldDoFn)}}. This expansion is used by the DirectRunner.
> The right approach to provide a ready implementation in runners-core is the one taken by {{GroupAlsoByWindowViaWindowSetDoFn}} where the unsupported features are provided to the constructor of the {{DoFn}}, rather than expected to be passed through the {{ProcessContext}}.
> These features are not guaranteed to be part of the public state & timers API of {{DoFn}}, particularly in the case of watermark holds, so it is not prudent to plan on waiting for the new state & timers API and porting over.
> These issues create real blockers by causing dependency cycles between implementing {{DoFn}} fully (requires no use of unsupported features), implementing new state and timers (requires new {{DoFn}}), and keeping the hack until new {{DoFn}} has state and timers (requires use of unsupported features).
> To break the cycle, the tests that rely on unsupported features are being disabled. They can be re-enabled either by following the design suggested above (probably the most robust approach) or by waiting and porting to new features as they are available.



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