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https://issues.apache.org/jira/browse/ARROW-10625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman reassigned ARROW-10625:
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Assignee: Weston Pace (was: Ben Kietzman)
> [C++] Optimize Future<> creation
> --------------------------------
>
> Key: ARROW-10625
> URL: https://issues.apache.org/jira/browse/ARROW-10625
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 2.0.0
> Reporter: Ben Kietzman
> Assignee: Weston Pace
> Priority: Major
> Fix For: 3.0.0
>
>
> {{Future<>}} is more expensive to construct than necessary. A few
> optimizations could be pursued:
> - Store the future's result in the same allocation which houses the
> ConcreteFutureImpl
> - Apply the small buffer optimization to FnOnce so that small continuations
> do not incur another heap allocation
> - Contention for the global waiter lock is unlikely to be an issue, but it'd
> be good to measure
> - Futures will usually have few callbacks, so a vector may be unnecessary
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