​

Release of Canton 3.6.2

Canton 3.6.2 has been released on October 15, 2026.

​

Summary

This patch release fixes a slow Ledger API query that could stall the initialization of the ACS commitment processor in Canton 3.6.1 by using index lookups.

​

What’s New

​

Event sequential id range lookup of Ledger API update streams with index scans

​

Background

Canton 3.6.1 contains a slow database query that can cause SQL timeouts and stall the long-running initialization of the new ACS commitment processor. SVs and high-volume validators are the most likely to be affected. The slowdown came from how the Ledger API server mapped a requested offset range to the corresponding range of event sequential ids. The query aggregated over every lapi_update_meta row in the offset range, so its cost grew with the size of that range.

​

Specific Changes

• The event sequential id range is now resolved with two index lookups on lapi_update_meta, so the cost no longer depends on the size of the offset range.

​

Impact and Migration

Starting an update stream over a large offset range is now cheaper. As a result, the ACS commitment processor initializes faster and is less likely to hit SQL timeouts. Ledger API results are unchanged, and no migration is required.

​

Compatibility

The following Canton protocol versions are supported: Canton has been tested against the following versions of its dependencies: