Deterministic updates #10715
Merged
Deterministic updates #10715
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
acdlite
force-pushed
the
deterministicupdates
branch
7 times, most recently
from
2d46bad
to
20eb374
Compare
acdlite
force-pushed
the
deterministicupdates
branch
2 times, most recently
from
e2ab6b9
to
d47de1e
Compare
|
Deploy preview ready! Built with commit e2ab6b9 |
|
Deploy preview ready! Built with commit d0d798e |
acdlite
force-pushed
the
deterministicupdates
branch
10 times, most recently
from
9a31c91
to
d0d798e
Compare
acdlite
force-pushed
the
deterministicupdates
branch
4 times, most recently
from
d70d52e
to
e3debd7
Compare
sebmarkbage
reviewed
Oct 10, 2017
| props: mixed, | ||
| renderExpirationTime: ExpirationTime, | ||
| ): State { | ||
| ): State | null { |
There was a problem hiding this comment.
Why can this return null now?
sebmarkbage
reviewed
Oct 10, 2017
| ) { | ||
| const coalescedTime = insertAfter.expirationTime; | ||
| queue.expirationTime = update.expirationTime; | ||
| } |
There was a problem hiding this comment.
If you expand the if (queue.last === null) { block to include the else condition instead of doing an early return, we can reuse this logic for both branches instead of duplicating.
acdlite
force-pushed
the
deterministicupdates
branch
from
e3debd7
to
1990983
Compare
This was referenced Nov 8, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
High priority updates typically require less work to render than low priority ones. It's beneficial to flush those first, in their own batch, before working on more expensive low priority ones. We do this even if a high priority is scheduled after a low priority one.
However, we don't want this reordering of updates to affect the terminal state. State should be deterministic: once all work has been flushed, the final state should be the same regardless of how they were scheduled.
To get both properties, we store updates on the queue in insertion order instead of priority order (always append). Then, when processing the queue, we skip over updates with insufficient priority. Instead of removing updates from the queue right after processing them, we only remove them if there are no unprocessed updates before it in the list.
This means that updates may be processed more than once.
As a bonus, the new implementation is simpler and requires less code.
To avoid conflicts, this works off my expiration times (#10426) and prerendering (#10624) PRs.