Prevent stale legacy root from clearing a container (DRAFT) #18792

bvaughn · 2020-04-30T18:10:16Z

Fixes the legacy root bug we observed after the recent sync (caused by #18730).

Alternate fix to #18781.

codesandbox-ci · 2020-04-30T18:12:26Z

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sizebot · 2020-04-30T18:15:43Z

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Comparing: 53d68b3...b6312ff

react-test-renderer

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react-native-renderer

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react-reconciler

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sizebot · 2020-04-30T18:17:51Z

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Comparing: 53d68b3...b6312ff

react-dom

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react-test-renderer

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bvaughn · 2020-04-30T18:55:13Z

The thing I'm not able to repro in a test yet (but that we're seeing within Facebook) is completeWork() running for the initial root after the new root has been committed. The sequence in both cases is:

unmountComponentAtNode() root 1
unmountComponentAtNode() -> unbatched update root 1
legacyRenderSubtreeIntoContainer() update root 1

legacyRenderSubtreeIntoContainer() mount root 2
completeWork() Marking root to be cleared root 2
clearContainer() root 2

completeWork() root 1 // I can't reproduce this in a test though

trueadm · 2020-04-30T19:18:13Z

@bvaughn Nice findings. It might have something to do with the fact that when we call unmountComponentAtNode, we schedule a discrete event on root 1. If you call focus later (after we mount root 2), it flushes the pending scheduled work in root 1, causing it to render again, thus causing it to hit the completion phase on root 1.

bvaughn · 2020-04-30T21:26:32Z

I think I got it!

bvaughn · 2020-04-30T21:34:51Z

Thanks @trueadm, that comment was very helpful in helping me realize the thing I was missing in my test.

trueadm · 2020-04-30T21:41:21Z

This is awesome! I wonder if we use createRoot do we have a similar issue?

bvaughn · 2020-04-30T22:00:33Z

I wonder if we use createRoot do we have a similar issue?

No, I don't think so. This only applies to legacy roots.

Also if you tried to create a new root (createRoot(container)) before the old one finished flushing the unmount, we warn about it.

trueadm · 2020-04-30T22:06:50Z

packages/react-reconciler/src/ReactFiberCompleteWork.new.js

+          // can sometimes cause the container to be cleared after the new render.
+          const containerInfo = fiberRoot.containerInfo;
+          const legacyRootContainer =
+            containerInfo == null ? null : containerInfo._reactRootContainer;


The only reason I opted to do this in the renderer in my PR was because this seemed host-specific. I see you reasoning for doing it earlier though, it avoids doing unecessary work before it's too late. Another approach could be to expose a host config function that does this check (as this is only related to the legacy roots, which doesn't necessarily affect other renderers) that can do this check for us.

Yeah, I guess it is DOM renderer specific (then again, so is clearContainer itself really). I just thought it would be better to do this check earlier rather than in the perf-sensitive commit phase. Will be great to remove this check entirely eventually.

trueadm

I'm more than happy with this change - awesome stuff! My comment can be worked on in the future as a TODO, as I don't see it blocking this.

bvaughn · 2020-04-30T22:56:16Z

Thanks for the review, Dominic. I'm going to merge this to hopefully unblock you on the sync. (Let me know if you need someone to take over the sync btw.)

I can follow up later if there are concerns or suggested changes from others.

sebmarkbage · 2020-04-30T23:11:29Z

packages/react-dom/src/__tests__/ReactDOMFiber-test.js

+
+    ReactDOM.render(<NewApp />, container);
+
+    // Calling focus again will flush previously scheduled discerete work for the old root-


Something is off here because there's no concept of "discrete work" for legacy mode (and I'm removing it for CM too). At least there shouldn't be. Maybe for passive effects but that doesn't kick in here.

There's only Sync work in legacy mode.

What do you mean by discrete work here? It might that something is misnamed in a method or something.

It could also indicate a bigger bug in legacy mode.

@sebmarkbage This comment was based on Dominic's comment above.

@sebmarkbage Upon calling scheduleUpdateOnFiber, you add an entry to rootsWithPendingDiscreteUpdates which is the problem in this issue. I'd assume your work of removing the concept of discrete work didn't include this particulat code-path?

I haven't landed that part yet. Still blocked on some stuff.

Concretely I'm worried that we've accidentally landed "discrete" semantics in legacy mode at some point. I.e. some subtle breaking change.

sebmarkbage · 2020-04-30T23:13:28Z

packages/react-reconciler/src/ReactFiberCompleteWork.new.js

+          // can sometimes cause the container to be cleared after the new render.
+          const containerInfo = fiberRoot.containerInfo;
+          const legacyRootContainer =
+            containerInfo == null ? null : containerInfo._reactRootContainer;


This field is DOM specific. Not sure what happens to this code in RN. I guess it would just schedule a Snapshot which is currently a noop?

Yes. RN doesn't have a way to clear its container anyway (since there's no native API).

I mentioned this too in my previous comment. It's something we can address in a follow up.

Even though it is kind of renderer-specific, I don't know if I agree that moving it into the host config (and commit phase) is a good follow up change. Happy to talk more about it though. I agree that having a renderer-specific legacy check here isn't great either. Just felt less bad than incorrectly scheduling commit phase work.

Yeah, it sucks either way. I guess a complete phase legacy check is less bad as it has less overhead than my commit phase fix and we know we'll likely be removing it in the near future.

Don't clear a container because of a stale legacy root

350e02d

bvaughn mentioned this pull request Apr 30, 2020

Handle legacy root contains in clearContainer #18781

Closed

facebook-github-bot added CLA Signed React Core Team Opened by a member of the React Core Team labels Apr 30, 2020

bvaughn marked this pull request as ready for review April 30, 2020 21:34

bvaughn requested review from gaearon, trueadm and sebmarkbage April 30, 2020 21:36

bvaughn force-pushed the fix-clearContainer-legacy-bug branch from e486c16 to 6366862 Compare April 30, 2020 21:37

Added test repro for FB error

b6312ff

bvaughn force-pushed the fix-clearContainer-legacy-bug branch from 6366862 to b6312ff Compare April 30, 2020 21:37

trueadm reviewed Apr 30, 2020

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trueadm approved these changes Apr 30, 2020

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bvaughn merged commit ac533fd into facebook:master Apr 30, 2020

bvaughn deleted the fix-clearContainer-legacy-bug branch April 30, 2020 22:56

sebmarkbage reviewed Apr 30, 2020

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sebmarkbage mentioned this pull request May 1, 2020

Don't "schedule" discrete work if we're scheduling sync work #18797

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Prevent stale legacy root from clearing a container (DRAFT) #18792

Prevent stale legacy root from clearing a container (DRAFT) #18792

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		ReactDOM.render(<NewApp />, container);

		// Calling focus again will flush previously scheduled discerete work for the old root-

Prevent stale legacy root from clearing a container (DRAFT) #18792

Prevent stale legacy root from clearing a container (DRAFT) #18792

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