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Motivation

Right now, in master DS will use one single thread to dispatch the tasks. The problem is all tasks are stored at one waiting queue, if a task dispatch failed then it will be moved to the end of waiting queue.

There exist a case, if a worker is overload at one worker group, and A, B ,C are using the worker, the priority is A > B > C, if the A dispatched failed, then begin to dispatch B, but the worker changed from overload to normal, then B will be dispatched successfully, this will caused problem, since priority of A is higher than B.

Design Detail

Different worker group use different waiting queue.

We need to make one waiting queue should only be handled by one dispatch thread. Once a task dispatched failed it should be put back to its worker group queue.

Compatibility, Deprecation, and Migration Plan

No response

Test Plan

No response

Code of Conduct

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