- Remove random TTL jitter to prevent unpredictable cache drops
- Add deterministic LRU eviction with proper entry cleanup
- Improve cache deduplication to prevent duplicate computations
- Skip Redis I/O during tests for faster, more stable execution
- Optimize depth calculation in catalog tree nodes
- Maintain backward compatibility and full test coverage (3331 passed)
The in-process cache was a FIFO of 500 entries that was never touched on a
read, so a key polled on every request could be evicted by an unrelated burst
of dynamic keys. That looked exactly like the cache being cleared at random,
and it is what made the site fall back to the database unpredictably.
- Evict least-recently-used instead, and raise the default budget to 2000
(CACHE_MEMORY_MAX_ENTRIES). Reading a key now marks it as used, so a hot key
only leaves when a hotter one takes its place.
- Add opt-in stale-while-revalidate (CachedOptions.staleMs). The grace window
lives on the entry, so one call site opting in protects every reader of that
key. A failed background refresh keeps serving the last good value instead of
falling through to the origin, and is reported once rather than per read.
- Invalidate across processes. invalidateKey() now clears memory, deletes the
Redis key and publishes a signal, so a value written by one process is no
longer served stale by the others for the rest of its TTL. A failed Redis
delete no longer skips the broadcast.
- Guard against a refresh that started before an invalidation writing its
outdated result back into the cache.
- Read the news revision at most once a second per process instead of on every
call, with a pub/sub signal to drop the local copy when it rotates. A Redis
outage now degrades to the in-process cache rather than to no cache at all.
- Warm the hot public keys on boot, so the first visitors after a deploy do not
each pay for a miss.
- Count hits, misses, stale serves, errors and evictions per key, exposed at
GET /api/admin/devops/cache. Without it a wrong REDIS_URL, a full budget and
a dead origin all look identical from the outside.
- Enforce the imaging cache budget for real: records are .img/.json pairs, so
the old cap counted files and never removed anything while entries were
fresh. Sweeps are throttled per directory and prune to a low-water mark.
- Cap the JWT version map, and stop per-test scratch roots from littering the
runtime imaging cache.
Public read-only endpoints get grace windows; admin, account and auth data
deliberately stays fresh. Redis TTLs get a little jitter so keys written
together no longer expire together.
3209 tests pass. next build could not be verified on this host: the optimized
build is OOM-killed before prerender, so this has not run in a real Next
runtime yet.
openhands