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Posted to issues@arrow.apache.org by "Weston Pace (Jira)" <ji...@apache.org> on 2021/03/25 18:54:00 UTC

[jira] [Created] (ARROW-12091) [C++] Allow AddCallback/Then to take in an optional Executor.

Weston Pace created ARROW-12091:
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             Summary: [C++] Allow AddCallback/Then to take in an optional Executor.
                 Key: ARROW-12091
                 URL: https://issues.apache.org/jira/browse/ARROW-12091
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace


Right now `Executor::Transfer` isn't perfectly reliable since callbacks added after the future has been completed will be run synchronously and so the thread task would be spawned at the wrong time.  With this feature `Executor::Transfer` could be fixed.

This would need to be added to both `Then` and `AddCallback`.

Ideally the methods would detect if the current thread is already on the desired executor and do nothing in that situation.  Spinning up unnecessary thread tasks would do more harm than good.



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