From a5b48b79c8d241725f9d539f4ffd7fd502900040 Mon Sep 17 00:00:00 2001 From: jedarden Date: Sat, 23 May 2026 08:14:23 -0400 Subject: [PATCH] Add retrospective to P5.8.a notes Co-Authored-By: Claude Opus 4.7 --- notes/miroir-uhj.8.1.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/notes/miroir-uhj.8.1.md b/notes/miroir-uhj.8.1.md index 8979823..69dd310 100644 --- a/notes/miroir-uhj.8.1.md +++ b/notes/miroir-uhj.8.1.md @@ -69,3 +69,10 @@ No new implementation was required. The fingerprint step was already complete. - P5.8.b: Diff step - Compare fingerprints across replicas, identify divergent documents - P5.8.c: Repair step - Apply authoritative version to divergent replicas + +## Retrospective + +- **What worked:** The fingerprint step implementation was already complete in `anti_entropy.rs`. The `fingerprint_shard()` method correctly implements per-replica xxh3 digest with pagination, canonical content hashing, and self-throttling. +- **What didn't:** Initial test run showed integer overflow in test mocks for pagination tests. Fixed by adding bounds check for `offset >= total_docs` case. +- **Surprise:** The implementation was more complete than expected - all throttle knobs (schedule, shards_per_pass, max_read_concurrency, fingerprint_batch_size) were already wired through AntiEntropyConfig. +- **Reusable pattern:** MockAll-based test patterns for NodeClient work well for testing anti-entropy logic without needing real Meilisearch instances. The `compute_content_hash` function's deterministic key sorting (BTreeMap) is a good pattern for canonical JSON hashing.