How to annotate extrinsic as non transactional?

Question

it looks like that in version of 28 polkadot was change that extrinsics are by default transactional.

Before that we used attribute #[transactional] for specific extrinsic in order to have transactional extrinsics.

But now it looks like that all extrinsic by default are transactional and in our case we do not want to have all the extrinsics transactional.

Is there attribute in order to annotate extrinsic as non-transactional ?

Answer 1

Pasting context from #10806 itself, very well documented, please check.

Annotation for safe without storage layer

Now that the default behavior of extrinsics will be to spawn at least one transactional layer, we can introduce an opt-in optimization where a user can state that a function is safe to be executed without its own transactional layer.

For example:

    /// This function is safe to execute without an additional transactional storage layer.
    #[without_transactional]
    fn set_value(x: u32) -> DispatchResult {
        Self::check_value(x)?;
        MyStorage::set(x);
        Ok(())
    }

When this function is called directly, a transactional layer should not spawn for it.

If a user called dispatch_with_transactional to this function, a transactional layer also does not need to spawn.