- Move the URI reference logic from raylet to agent.
- Redefine the runtime env agent RPC to `CreateRuntimeEnvOrGet` and `DeleteRuntimeEnvIfPossible`
- More details https://github.com/ray-project/ray/issues/21695#issuecomment-1032161528
Future works
- We don't remove the `RuntimeEnvUris` from `RuntimeEnv` protobuf in current PR because gcs also uses those URIs to do GC by runtime_env_manager. We should also clear this.
- Ray client server shouldn't interact with agent directly. Or Ray client server should also decrease the reference count.
- Currently, `WorkerPool::HandleJobStarted` will be called multiple times for one job. So we should make sure this function is idempotent. Can we change this logic and make this function be called only once?
