Topic

CRDT

1 post about CRDT. Every summary links to the original.

Paid picks we use ourselves. Links carry a referral code — a subscription through one earns us a commission at no extra cost to you.

Newest first

Posts

Notion
How Notion handles concurrent editing with CRDTs
Notion replaced its text-editing system because its former last-write-wins storage could overwrite concurrent edits to the same block, with Offline Mode increasing the risk of lost changes. The new system uses a Conflict-free Replicated Data Type based on Replicated Growable Array, representing inserted text as uniquely identified items, retaining deletions as tombstones, and deterministically ordering concurrent inserts. Peritext-based annotation operations merge rich-text formatting such as bold, italics, and hyperlinks while preserving extendability rules. To keep edits correctly positioned when Enter splits a block, Notion introduced text slices, text slice trees, text instances, and compact search labels for locating slices across blocks. Deployed in July 2025, the system processes millions of CRDT operations per minute and supports Offline Mode and agent collaboration.

The best engineering reads, once a week.

Topic

1 post about CRDT. Every summary links to the original.

Paid picks we use ourselves. Links carry a referral code — a subscription through one earns us a commission at no extra cost to you.

Newest first

Notion
How Notion handles concurrent editing with CRDTs
Notion replaced its text-editing system because its former last-write-wins storage could overwrite concurrent edits to the same block, with Offline Mode increasing the risk of lost changes. The new system uses a Conflict-free Replicated Data Type based on Replicated Growable Array, representing inserted text as uniquely identified items, retaining deletions as tombstones, and deterministically ordering concurrent inserts. Peritext-based annotation operations merge rich-text formatting such as bold, italics, and hyperlinks while preserving extendability rules. To keep edits correctly positioned when Enter splits a block, Notion introduced text slices, text slice trees, text instances, and compact search labels for locating slices across blocks. Deployed in July 2025, the system processes millions of CRDT operations per minute and supports Offline Mode and agent collaboration.

The best engineering reads, once a week.