Allow worker-based engine to run some tasks locally

Registered by Ivan Melnikov

Most of times there are some tasks in the flow that are really lightweight and it is not worth to schedule it to some other machine. TaskFlow should provide a way for flow or task developers to mark their tasks as lightweight so that engine will execute and revert them locally.

Blueprint information

Status:
Not started
Approver:
Joshua Harlow
Priority:
Low
Drafter:
Ivan Melnikov
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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There are several possible ways to mark task as 'lightweight':
- decorators
- class attributes
- configuration parameters (e.g. list of lightweight tasks)
It may be also useful to mark 'heavyweight' task, and consider task lightweight by default.

Implementation note: it may be useful to implement this with special TaskExecutor that will check if task is lightweight and schedule it accordingly by delegating the job to WorkerTaskExecutor or ParallelTaskExecutor.

(?)

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