felipecrv commented on issue #40301:
URL: https://github.com/apache/arrow/issues/40301#issuecomment-2048302870
> tasks are not submitted to a specific thread, they are appended to a
shared queue which all existing worker pop from.
Seem fare to assume that a very eager loop like
```
for (int i = 0; i < num_tasks; ++i) {
ARROW_ASSIGN_OR_RAISE(futures[i], executor->Submit(func, i));
}
```
will reach capacity threads very quickly unless completing a task takes less
time than the cost of making `capacity` iterations of this loop.
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