[Core][Spill manager refactor 2] Implements ISpillWorkerPool with IOWorkerPool

[scv119]

Implements ISpillWorkerPoll interface using IOWorkerPool. Since IOWorkerPool is not thread safe we post it onto the IOWorkerPool io_context to execute.

TODO

• add tests and comments

[MissiontoMars]

Do we need CancelXXX ?

[rkooo567]

Pretty much same comment as previous PR. We only seem to have Start*, but not like Dispatch* APIs. Is StartSpillWorker if we need to start workers, and otherwise it will only dispatch work to it?

[bveeramani]

‼️ ACTION REQUIRED ‼️

We've switched our code formatter from YAPF to Black (see #21311).

To prevent issues with merging your code, here's what you'll need to do:

1. Install Black

pip install -I black==21.12b0

2. Format changed files with Black

curl -o format-changed.sh https://gist.githubusercontent.com/bveeramani/42ef0e9e387b755a8a735b084af976f2/raw/7631276790765d555c423b8db2b679fd957b984a/format-changed.sh
chmod +x ./format-changed.sh
./format-changed.sh
rm format-changed.sh

3. Commit your changes.

git add --all
git commit -m "Format Python code with Black"

4. Merge master into your branch.

git pull upstream master

5. Resolve merge conflicts (if necessary).

After running these steps, you'll have the updated format.sh.

[kfstorm]

‼️ ACTION REQUIRED ‼️

We've updated our formatting configuration for C++ code. (see #22725)

This PR includes C++ code change. To prevent issues with merging your code, here's what you'll need to do:

1. Merge the latest changes from upstream/master branch into your branch.

git pull upstream master
git merge upstream/master

2. Resolve merge conflicts (if necessary).

After running these steps, you'll have the updated C++ formatting configuration.

3. Format changed files.

scripts/format.sh

4. Commit your changes.

git add --all
git commit -m "Format C++ code"

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

• If you'd like to keep this open, just leave any comment, and the stale label will be removed.

[stale]

Hi again! The issue will be closed because there has been no more activity in the 14 days since the last message.

Please feel free to reopen or open a new issue if you'd still like it to be addressed.

Again, you can always ask for help on our discussion forum or Ray's public slack channel.

Thanks again for opening the issue!