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

    [ https://issues.apache.org/jira/browse/ARROW-13155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616007#comment-17616007 ] 

Apache Arrow JIRA Bot commented on ARROW-13155:
-----------------------------------------------

This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per [project policy|https://arrow.apache.org/docs/dev/developers/bug_reports.html#issue-assignment]. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [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
>            Assignee: 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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