perf: cut per-request work on the getDocument hot path - #980
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The point, linestring and polygon decode filters live in a static registry shared by every Database instance, yet they read $this->adapter. PHP binds $this to whichever instance constructed the closure last, so in a long-running worker with pooled per-tenant instances the decode ran against a foreign adapter — and decodePoint differs per adapter (MySQL WKB, Postgres text, Mongo arrays). The filters are already invoked with the calling instance as their third argument, so take it as a parameter rather than relying on the binding. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Profiling appwrite shows Database::getDocument at 32% of CPU — every read resolves its collection through it as well. Inside that path getCacheKeys accounts for 8.6% and rebuilds identical values on every call: - getActiveFilterSignatures walked both filter maps and ksorted them per call. It is now cached per instance behind a version counter that addFilter bumps. - The cache key payload json_encoded a nested array per call. The filter map is cached pre-encoded and selects are only encoded when present. - The constructor registered the seven default filters on every instantiation, spending 14 ReflectionFunction constructions on signatures that never differ. They register once now, and unbound, so the static registry no longer pins the last Database instance alive. - getInternalAttributes array_filtered a constant twice per document. - PDO::getHostname re-parsed the DSN on every cache key computation. Measured: cache key payload 3.6us -> 1.8us, construction 11.0us -> 6.5us. Document cache keys change shape, so a deploy starts on a cold document cache — as it already does whenever a filter closure moves, since filter signatures are file:line based. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change registers default filters once, caches filter signatures and parsed hostnames, updates document cache-key construction, and adds tests for filter invalidation and instance-specific spatial decoding. ChangesDatabase filter lifecycle
PDO hostname caching
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Refactor 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Making it static to suit the now-unbound encode closures would have been a breaking change for a library: it is protected on a class downstream repos subclass, and a subclass overriding it non-statically fatals at class load. The encode filters already receive the calling instance as their third argument, same as decode, so take it there instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The filter memo was guarded by comparing key strings before and after a change, which makes the key format itself the contract: a harmless reshaping breaks the test, while a cache that ignored the key entirely would still pass. Drive getDocument() against a real cache instead and assert what callers observe — a document cached under the previous filter set is not served once that set changes, and a later instance with the same config hits the entry the first one wrote. This needs a cache that honours the hash argument scoping the document key. Only the Redis adapters do; the bundled Memory adapter drops it, so the test doubles their key/field semantics in memory. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@greptileai — took the finding, it was right.
I checked the first one fails for the right reason: dropping the One thing worth a look, independent of this PR. Writing that test surfaced that That is pre-existing and belongs in Also in this PR and worth a reviewer's eye: |
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Thanks for the follow-up. The behavioral cache tests address the original finding: they verify both invalidation when the global filter set changes and reuse across equivalent |
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@greptileai review Re-reviewing to refresh the summary: the one open finding was withdrawn on the thread, and the earlier one was fixed in |
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Inline comments:
In `@src/Database/Database.php`:
- Around line 10196-10197: Update the memoization guard in the filter-signature
computation around filterSignaturesVersion so changes to the protected
instanceFilters callbacks invalidate the cached signature. Snapshot and compare
the current instance-filter callbacks before returning the memoized value, while
preserving reuse when both static and instance filter inputs are unchanged.
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src/Database/Database.phpsrc/Database/PDO.phptests/unit/FilterRegistryTest.phptests/unit/HashAwareMemoryCache.phptests/unit/SpatialFilterTest.php
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The memo was only versioned against the static registry, so a subclass replacing $instanceFilters after construction kept the old cache key: a read could be served an entry written under the previous callbacks, and a miss would write the new value back under that same stale key. Snapshotting the array and comparing identity closes it. Nothing in the library reassigns the property, so the comparison hits PHP's pointer short-circuit for arrays that share a zend_array and costs nothing on the hot path. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Registering the defaults once left the registry order-dependent: an addFilter() for a built-in name issued before the first constructor was clobbered by it, while the same call after one was permanent. Appwrite Cloud overrides 'datetime' this way from its migration workers, so the rule it lands on matters. Register the defaults on first touch of the registry instead, from addFilter() as well as the constructor, so an explicit registration always wins. The guard is set before the defaults are registered because addFilter() now calls back into the registrar; that guard is what ends the recursion. Also restore the static registry between tests. addFilter() has no removal API, so a test registering a filter otherwise leaked into every test that ran after it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The boot-order test compared a signature string inside the static filter registry, which passes whether or not the override is the filter that actually executes. Decode a datetime through it instead: the override hands the value back untouched where the built-in would return ISO 8601, so the assertion now fails on the behaviour rather than on a representation. Reflection still resets the statics to stand in for a fresh process — there is no public way to unregister a filter — but it is confined to setup and teardown, not the assertion. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Profiling appwrite in production (Pyroscope, 6h window, 36M samples) puts
Database::getDocumentat 32.5% of total CPU — every read goes through it twice, since resolving the collection is itself agetDocumentagainst_metadata. Inside that path the work is dominated by values that are recomputed per call but never change:Database::getCacheKeysDatabase::getActiveFilterSignaturesksortmd5The
json_encodeonDatabase.php:9993alone is attributed 4.52% of total CPU.Changes
perf: memoize per-request work on the getDocument hot pathgetActiveFilterSignatures()walked both filter maps andksorted them on every call. Now cached per instance behind a version counter thataddFilter()bumps. The$disabledsubtraction moved to anarray_diff_keyon the rare path.json_encoded a nested array per call. The filter map is now cached pre-encoded and selects are only encoded when non-empty.self::addFilter()seven times per instantiation, spending 14ReflectionFunctionconstructions computing signatures that never differ. They register once now.getInternalAttributes()array_filtered a constant twice per document (casting()anddecode()).PDO::getHostname()re-parsed the DSN on every cache key computation.Measured locally, with mock-adapter overhead subtracted: cache key payload 3.6µs → 1.8µs,
Databaseconstruction 11.0µs → 6.5µs.fix: decode spatial values with the calling database's adapterMaking the default filters unbound surfaced a real bug. The
point,linestringandpolygondecode filters live in the staticself::$filtersregistry shared by everyDatabaseinstance, but read$this->adapter. PHP binds$thisto whichever instance constructed the closure last, so in a long-running worker with pooled per-tenant instances, spatial decoding ran against a foreign adapter — anddecodePointdiffers per adapter (MySQL WKB, Postgres text, Mongo arrays).They are already invoked as
$filter['decode']($value, $document, $this), so the correct instance was being passed and ignored. They now take it as a parameter.FilterRegistryTest::testSpatialDecodeUsesTheCallingDatabaseAdapterfails onmain— the second database's adapter decodes the first one's point — and passes here.As a side effect the static registry no longer pins the last-constructed
Database(and its adapter and PDO connection) alive for the life of the process.Notes for review
file:linebased and move whenever a filter closure moves.getInternalAttributes()now returns a list. It previously returned thearray_filterresult with a gap where$tenantwas removed; it is re-indexed witharray_values(). Every caller iterates orarray_maps it, and a gapped array alsojson_encodes as an object rather than an array.PDO::getHostname()'s saving is real but modest in cloud, where the call arrives throughAdapter\Pool::delegate()and the pooled-connection checkout around it costs more than the DSN parse it skips. Appwrite's pool adapter never reaches it at all.encodeSpatialData()stays an instance method. Making it static would have suited the unbound closures, but it isprotectedon a class downstream repos subclass, and a subclass overriding it non-statically fatals at class load. The encode filters take the calling instance as a parameter instead — the same shape as decode.addFilter()bumps a version counter that invalidates every instance's memo, and the memo snapshots$instanceFiltersand compares identity, so a subclass reassigning that property cannot keep serving entries cached under the previous callbacks. The comparison hits PHP's pointer short-circuit for arrays sharing azend_array, so it costs nothing on the hot path.Downstream impact — please read before merging
Database::addFilter()with a built-in name now persists for the life of the process. Previously everynew Database()re-registered the seven built-ins, so an override of one was undone by the next construction. Registering them once removes that.This is not hypothetical.
appwrite-labs/cloudoverrides the built-indatetimefilter with an identity function from two workers:src/Appwrite/Cloud/Platform/Workers/MigrationsCloud.php:74src/Appwrite/Cloud/Platform/Workers/MigrationsCloudValidation.php:117Both call it inside
action(), i.e. after instances exist. Before, the override lasted until the nextDatabasewas constructed and each job re-applied it; now it holds for the rest of that worker process. The blast radius is contained today — both live in dedicated single-action worker processes that re-apply the same override on every job — but the semantics changed underneath cloud without cloud changing a line, so it should be a conscious call, not a surprise.The fix in
cf7862cat least makes the rule coherent: the defaults now register on first touch of the registry (fromaddFilter()as well as the constructor), so an explicit override always wins whether it runs before or after the first instance. Previously an override issued at boot, before anyDatabaseexisted, was silently discarded — that footgun is gone.Recommended follow-up in cloud, not required by this PR: pass that
datetimeoverride as an instance filter through theDatabaseconstructor rather than mutating the global registry. It is then scoped to the instance that needs it and, because instance filters are part of the cache-key signature, its reads stop sharing cache entries with the API's.Cloud's other six registrations (
app/init/database/formats.php) and all of appwrite's use customsubQuery*names, so they are unaffected.Verification
474 unit tests pass (3 new), PHPStan level 7 clean, Pint clean.
Not verified locally: the e2e adapter matrix. This repo's
docker-compose.ymlhardcodescontainer_name, so only one checkout can hold the stack at a time and another was using it. Relying on CI for all 16 adapter jobs — the spatial (point/linestring/polygon) and SharedTables suites are the ones that matter most here.🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Performance