Remove the caller-identity cache - #267
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe change removes caller-identity caching from value storage and insertion. Audits, tests, benchmarks, subtree checks, and documentation are updated. New coverage checks that replaced values release their stored nodes. ChangesCaller-identity cache removal
Estimated code review effort: 3 (Moderate) | ~25 minutes Suggested reviewers: Merge Risk: ⚪ Minimal · up to Default inserts retain the direct-value path. No outstanding issue identified here prevents merging after normal checks. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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oschwald
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In `@tree.go`:
- Line 157: Update New so tree.inserter remains nil when Options.Inserter is
omitted; remove the unconditional inserter.Replace initialization while
preserving the configured inserter when provided. This lets default Insert and
InsertRange calls use the direct-value path with nil resolver semantics.
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CHANGELOG.mdaudit.goaudit_test.godefault_inserter_test.gonode.gotree.gotree_test.govalue_store.govalue_store_benchmark_test.govalue_store_test.go
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- audit.go
- value_store_test.go
- value_store_benchmark_test.go
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oschwald
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This cache was largely made obsolete by other changes. We would not substantially take advantage of the remaining uses and it could lead to higher memory use. |
The loader now reuses interned references directly, and callback inserts do not register caller identities. Drop the caller LRU and its retained input graphs while preserving store-owned view caching and direct insertion. Fixes STF-1789.
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Seems good. Claude came up with a few comments.
| @@ -459,14 +436,6 @@ func (s *valueStore) intern(value mmdbtype.DataType) (valueRef, error) { | |||
| s.retain(ref) | |||
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Repeated inserts of the same Go object are now about 140x slower. Without the caller-identity cache, each insert of the same object hashes, sorts and compares the full value graph again.
BenchmarkValueStoreEnterpriseValue/equal-shared-nested went from about 92 ns/op on HEAD~1 to about 13,003 ns/op on HEAD.
Callers that hit this path:
- A caller that decodes a source DB with
mmdbtype.NewUnmarshaler, which shares oneMapper data offset, and then callsTree.Insertfor each network. - A caller that reuses one record map in a loop.
With millions of networks, this can add minutes to a build. The PR description and CHANGELOG do not mention this slowdown. If the slowdown is acceptable, please note it. If not, a cheaper path for repeated inserts may be necessary.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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The slowdown for reused caller objects is an accepted tradeoff. The PR description records the Tree.Insert overlapping-workload result: median 1.89 ms before and 5.52 ms after removal. That measures full insertion rather than the store-only cache-hit operation.
The old Enterprise loader benefited from object reuse, but Load now reuses interned references directly. Enterprise overlays use callbacks and do not populate this cache. STF-1789 documents the evidence and the remaining risk to callers that reuse objects. We are removing the retention cost for fresh-input workloads without adding another cache option. Since v2 is unreleased, the changelog describes its resulting behavior rather than this intermediate optimization's removal.
🤖 Codex, on behalf of Greg.
| @@ -459,14 +436,6 @@ func (s *valueStore) intern(value mmdbtype.DataType) (valueRef, error) { | |||
| s.retain(ref) | |||
| return ref, nil | |||
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No test now checks that this materializedByIdentity fast path returns the cached ref. This PR deleted the only tests of identity-based reuse (TestValueStoreCachesUint128PointerIdentity and TestSuccessfulInsertCachesCallerIdentity).
To confirm, I changed the lookup to if ref, ok := s.materializedByIdentity[identity]; ok && false. The full suite still passed, with and without MMDBWRITER_REFCOUNT_AUDIT=1. TestReinsertingGetViewsPassesTheAudit checks only equality and audit balance.
The commit message says this change keeps the store-owned view cache. A test that inserts a Get view again and checks that the result is the cached ref (for example, no new node or a cache hit) would protect that.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Addressed in ae5b499. The Get-view reinsertion test now requires zero hash calls for both top-level and nested views, in addition to the existing equality and reference-count checks. Disabling the materializedByIdentity lookup makes both assertions fail: five hash calls for the top-level view and three for the nested view.
🤖 Codex, on behalf of Greg.
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| // The caller-identity cache serves the repeated shallow copies; the other | ||
| // cases disable it to measure the content-dedup and full-intern paths. | ||
| b.Run("equal-shared-nested", func(b *testing.B) { |
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equal-shared-nested now measures the same thing as equal-deep-copy. On HEAD they run at 13,003 ns/op and 13,241 ns/op. The subtest name still suggests that shared nested objects make a difference, but they no longer do.
Please remove this subtest, or replace it with a Tree.Insert benchmark that inserts the same object many times. That benchmark would make the cost of repeated inserts visible.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Removed equal-shared-nested in cba90dc. BenchmarkTreeInsertOverlappingPasses already exercises repeated objects through Tree.Insert, and its before/after result is in the PR description. The shallow-copy helper remains because benchmarkUniqueValues still uses it.
🤖 Codex, on behalf of Greg.
| inserts of the same object are cheap. Values that an inserter or `Tree.Get` | ||
| reads are materialized once and kept on their store nodes for later lookups | ||
| and merges. | ||
| - Values returned by `Tree.Get`, and existing values passed to inserter |
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The deleted bullet above was the only user-facing note that values read by Tree.Get or by inserters are materialized once and kept on their store nodes. That retention still exists (valueNode.materialized, materializedByIdentity).
A build that runs DeepMerge overlays over every record materializes a Go view of every existing value it touches. The store keeps each view until it releases the node, so the extra memory can be close to a full Go graph of the database. Please keep the second half of the deleted bullet.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Restored this in 38ebe4d: the changelog now states that each view is materialized once and kept until its store node is released.
🤖 Codex, on behalf of Greg.
| @@ -47,28 +47,14 @@ func BenchmarkEnterpriseKeyPipeline(b *testing.B) { | |||
| func BenchmarkValueStoreEnterpriseValue(b *testing.B) { | |||
| value := benchmarkEnterpriseValue() | |||
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(This is about tree_benchmark_test.go lines 219-225 and 246. That file is not in the diff, so I put the comment here.)
The BenchmarkEnterpriseLoadThenOverlay comment still explains the per-insert spec.value.Copy() with "would overstate identity-cache hits" and "exercise the caches at realistic occupancy". That cache no longer exists.
The Copy() call runs inside the timed loop. Each overlay insert now includes a deep-copy allocation that has no purpose, so the reported ns/op and allocs/op are higher than the real overlay cost. Please update the comment, or move the copies out of the timed loop.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Updated the comment in 2cd2c29 and removed the obsolete identity-cache explanation. The copies remain inside the timed loop to model the fresh input allocations made by production overlay passes. This benchmark measures loading, input allocation, and insertion together. Copying is a stand-in for fresh input construction, not a measurement of decoding itself.
🤖 Codex, on behalf of Greg.
| @@ -349,10 +347,7 @@ func (t *Tree) normalizeLoadPrefix(prefix netip.Prefix) (netip.Prefix, error) { | |||
| // (defaults to inserter.Replace). | |||
| // | |||
| // You must never modify the value after insertion. Values may be shared with | |||
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The reason in this sentence is now stale. Direct inserts no longer keep or share the caller's Go object. Only views from Get are store-owned.
Either keep the rule as a forward-compatibility contract and say so, or state the real hazard: changing a value that Get or an inserter returns.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Addressed in fa16732. The comment now states the immutability requirement as an API contract and drops the stale sharing explanation.
🤖 Codex, on behalf of Greg.
| // inserter.Replace explicitly has the same behavior but skips that | ||
| // optimization. | ||
| // Inserter is the default pure function for Insert, InsertRange, and Load. | ||
| // Nil replaces the old value with the new value, as inserter.Replace does, |
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The old doc said that passing inserter.Replace explicitly skips the direct-value path. That note is gone. The CHANGELOG (line 23) still refers to "the direct-value path" by name.
A user who sets Options.Inserter = inserter.Replace to be explicit sends every covered record through a callback, a memo and a per-record intern, instead of one intern at the start. "Without invoking a callback" does not tell them that nil is faster. Please restore the note, and use the same term as the CHANGELOG.
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Restored in 0408791. The option documentation now names the direct-value path, explains that nil avoids callback and memoization overhead, and states that explicit inserter.Replace skips that optimization.
🤖 Codex, on behalf of Greg.
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| // dataIdentityKey identifies a caller's Go object. All three fields are | ||
| // dataIdentityKey identifies a materialized Go object. All three fields are |
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(This is about the valueRef comment on line 20. That line is not in the diff, so I put the comment here.)
The comment still says "Identity-cache entries therefore own their reference or live no longer than the node". The "own their reference" case was the caller cache that this PR removes. The only identity cache left, materializedByIdentity, does not own references (see auditMaterializedIdentities).
A maintainer can read this comment and think that an owning identity cache still exists. Suggest: "Identity-cache entries therefore live no longer than the node."
🤖 Comment by Claude (Claude Code) on behalf of Will.
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Addressed in e909c8b. The comment now says identity-cache entries live no longer than the node, without suggesting they own a reference.
🤖 Codex, on behalf of Greg.
| payloads byteArena | ||
| children refArena | ||
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| // Cache only store-owned views, which merges reuse for unchanged values. |
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This sentence is hard to parse because "merges" reads as a verb. Suggest:
// Cache only store-owned views. Merges reuse them for unchanged values.🤖 Comment by Claude (Claude Code) on behalf of Will.
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Applied the suggested wording in e909c8b.
🤖 Codex, on behalf of Greg.
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Copilot review overview
🟢 Approval recommended
The reviewed changes have no unresolved approval-blocking issues.
Review effort: Balanced
Findings: None
What changed in this PR
Removes the caller-identity cache to release caller-owned object graphs while preserving content deduplication and store-owned view caching.
Changes:
- Removes caller-cache storage, registration, lookup, and auditing.
- Updates insertion ownership, documentation, benchmarks, and tests.
- Adds regressions for releasing replaced and removed values.
| File | Description |
|---|---|
value_store.go |
Removes caller-cache implementation. |
value_store_test.go |
Removes obsolete cache tests. |
value_store_benchmark_test.go |
Updates cache-free benchmarks. |
tree.go |
Simplifies direct insertion and documentation. |
tree_test.go |
Adds value-release regression coverage. |
subtree.go |
Updates ownership documentation. |
subtree_test.go |
Updates uniqueness coverage. |
node.go |
Removes caller-value tracking. |
CHANGELOG.md |
Removes obsolete cache documentation. |
audit.go |
Removes caller-cache auditing. |
audit_test.go |
Removes obsolete audit cases. |
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Direct inserts retain up to 1,048,576 caller objects in an identity cache, even when their contents deduplicate to one stored value. Remove that cache so fresh input graphs can be collected and replaced values can be released.
The old cache helped Enterprise's loader reuse decoded Go objects. An August 1 experiment found a 6.3% wall-time cost when removing it from a variant without nested-container hash caching. The current loader instead reuses interned references by source offset. Enterprise's four overlays use callbacks and do not populate the caller cache. Our remaining direct-insert reuse involves tiny records, while several builders create fresh maps per network. STF-1789 records the evidence and its limits.
Remove the LRU, identity registration and lookup, cache-owned references, and their audit code. Keep content deduplication, store-owned view caching, the direct insertion path, and the nil Options.Inserter default. Update the docs, benchmarks, and affected tests. A code comment explains why only store-owned views are cached.
Validation:
precious lint --allandgit diff --checkpass.Fixes STF-1789.
Related report: maxmind/mmdbconvert#110 (comment)
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