Author

vaibhav <vaibhavsharma@cloudflare.com> 2026-03-20 11:39:54 +0000

Parents

e6dc01a

Tree

3dbf7b0

Prevent unbounded alarm scheduling promise chain in ActorSqlite.

When user code repeatedly moves a Durable Object alarm to a later time
and scheduleRun calls to the alarm manager take longer than local SQLite
commits (common in production), the alarmLaterChain promise chain grew
without bound. This caused alarms to fire at times far in the past and
could block SRS commits for arbitrarily long when a subsequent setAlarm
moved the alarm earlier.
Replace the unbounded chain with a coalescing mechanism: at most one
scheduleRun is in-flight at a time, and rapid intermediate alarm times
are collapsed into a single pending value.