Fix queue management in jest-worker #7934
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packages/jest-worker/src/Farm.ts
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| private _enqueue(task: QueueChildMessage, workerId: number): Farm { | ||
| const item = {task, next: null}; |
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The core of the fix is only this line; where instead of pushing to all queues the task object, we create one specifically for each queue, (meaning that when doing .next in the tail of a linked list, we don't affect all others).
The rest of the PR are "cosmetic" changes, and the test.
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| lock(workerId: number): void { | ||
| private _lock(workerId: number): void { |
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technically breaking, but I guess these shouldn't be called anyways by consumers?
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Yeah, playing with worker locks is a recipe for disaster :D
| - `[jest-validate]` Fix validating async functions ([#7894](https://github.com/facebook/jest/issues/7894)) | ||
| - `[jest-circus]` Fix bug with test.only ([#7888](https://github.com/facebook/jest/pull/7888)) | ||
| - `[jest-transform]` Normalize config and remove unecessary checks, convert `TestUtils.js` to TypeScript ([#7801](https://github.com/facebook/jest/pull/7801) | ||
| - `[jest-transform]` Normalize config and remove unecessary checks, convert `TestUtils.js` to TypeScript ([#7801](https://github.com/facebook/jest/pull/7801)) |
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took me forever to spot the fixed missing paren :P
| private _numOfWorkers: number; | ||
| private _offset: number; | ||
| private _queue: Array<QueueChildMessage | null>; | ||
| private _queue: Array<QueueItem | null>; |
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| private _queue: Array<QueueItem | null>; | |
| private _queue: Array<QueueItem>; |
right? there can never be nulls in the queue now?
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The queue can be empty, and that's signaled by a null item.
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so Array<QueueItem> | [null]? I guess it doesn't matter in practice
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The array index refers to each of the workers (I.e. this._queue.length is numOfWorkers, not the list of jobs); so each item in the array is either the first element of the linked list, or null.
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Nodes in a linked list were shared among all lists for each worker; which is not what we would like to do. The expected part to be shared is only the request object (which uses the first position as a lock between jobs); but the wrapper object for the linked list needs to be unique.
I also added a test that would crash without the fix.