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Posted to jira@arrow.apache.org by "Apache Arrow JIRA Bot (Jira)" <ji...@apache.org> on 2022/10/11 17:52:00 UTC

[jira] [Assigned] (ARROW-13155) [C++] MapGenerator should optionally forward reentrant pressure

     [ https://issues.apache.org/jira/browse/ARROW-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Arrow JIRA Bot reassigned ARROW-13155:
---------------------------------------------

    Assignee:     (was: Weston Pace)

> [C++] MapGenerator should optionally forward reentrant pressure
> ---------------------------------------------------------------
>
>                 Key: ARROW-13155
>                 URL: https://issues.apache.org/jira/browse/ARROW-13155
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Weston Pace
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Currently the map generator will allow the map function to run in parallel but it will not forward reentrant pressure onto the source generator.  Instead it queues requests.
> In some cases this is the right decision (if source is not async reentrant) but in some cases we want it to forward the pressure (so that the entire chain can run in parallel).
> By making it an option when the mapped generator is created we can allow pressure to be forwarded where appropriate.
>  
> Phrasing it another way.  If we have source, map function A, map function B, map function C, and then a reentrant pull we would currently only run C in parallel.



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