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… length (LAB-348) The sync wrapper served every L2 hit without re-warming L1, so after an L1 eviction or restart each sync call re-paid the L2 read + deserialize until the next miss-store; the async wrapper has backfilled L1 on L2 hits all along. The sync handler getters now return the raw envelope alongside the value — the same (True, value, raw_bytes) shape as the async variants, None on the mmap fast path whose view must never reach L1 — and the sync wrapper feeds it through the shared _l1_backfill_from_l2 helper, so the stale-exclusion and remaining-freshness bound apply to sync exactly as they do to async. The sync L2-hit stats sized the payload as len(str(value)): a repr, not the payload, rendered on every hit. Both paths now record the envelope's byte length, and the async hit records gain the serializer/hit labels the sync path already emitted, so the get metric reads the same for both. Refs #164
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Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 3 reviews per hour. WalkthroughCache reads now return raw serialised envelopes and payload sizes with decoded values. L2 hits use this data for metrics and freshness-aware L1 backfill. Mmap reads return no envelope. Tests cover synchronous, asynchronous, stale, mmap, and refused-backfill paths. ChangesCache hit envelope and backfill
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to No merge-blocking behavior issue was identified in the updated cache-hit paths. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
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Full details: Description checkExplanation The description explains the implementation, motivation, tests, and behavioural changes. However, it does not follow the required template and omits the Type of Change, Security Checklist, Documentation Validation Checklist, Backward Compatibility, and Additional Notes sections. It also contains an inconsistency between the stated 3-tuple and the implemented 4-tuple return shape. Resolution Add all required template sections and complete the applicable checkboxes. Mark the change as a breaking change because public cache read return contracts changed. Document the migration path and public API documentation updates. Correct the description so all references use the implemented 4-tuple shape: (True, value, raw_bytes, size_bytes). Include the required test and benchmark status.
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In `@src/cachekit/cache_handler.py`:
- Line 1388: Update the mmap hit path in the cache retrieval method around
_MmapHandle.view to capture handle.view.nbytes before handle.close(), pass that
value as separate hit-size metadata so metrics preserve the mmap envelope size,
and keep raw_bytes=None to avoid L1 backfill. Add a regression test verifying
the mmap hit records the expected size metric.
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…catch (LAB-348) Review follow-ups on #294: - CodeRabbit: an mmap fast-path hit returned no envelope, so size_bytes fell to 0 and the hit dropped out of cache_operation_size_bytes. The hit tuple now carries size_bytes as a fourth slot on every path — the handler owns the size (len(envelope), or view.nbytes read before the mmap handle closes) and the wrapper only records it. The mmap end-to-end test asserts it. - Kody: the best-effort backfill catch was a broad `except Exception`. L1Cache.put documents exactly one refusal — TypeError on a non-bytes envelope — so the catch names it; anything else is an L1 bug and propagates to the existing cache_get error path.
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Summary
This PR brings the sync cache decorator to parity with the async path by adding L1 backfill on L2 hits and correcting cache size statistics (LAB-348, cachekit-py#164).
Changes
L1 backfill on sync L2 hits
Previously, only the async decorator backfilled the L1 (in-memory) cache after an L2 (backend) hit. The sync decorator did not, meaning every read of the same key re-paid the L2 round-trip. This PR:
get_cached_valueandget_cached_value_with_freshnessto return a 3-tuple(True, value, raw_bytes)instead of a 2-tuple, carrying the raw serialized envelope so the sync decorator can backfill L1 without re-serializing (re-encrypting).fresh_for).raw_bytesasNoneon the mmap fast path, since the mapped view is frame-confined and must never reach L1.Corrected size statistics
len(str(value))accounting with the actual serialized envelope length (len(cached_data)) forsize_bytesstats. The oldstr(value)repr was neither the true payload size nor cheap to compute on every hit.Best-effort backfill hardening
putin a try/except so a refused put (e.g., an out-of-contract backend returning a non-bytes envelope) is logged and swallowed rather than surfacing to callers, which would otherwise demote a served hit into a recompute on every call.Async metric label consistency
serializer(l1_memory/rust),size_bytes, andhit=Truefields.Tests
test_l2_hit_l1_backfill.pypins sync/async parity: L2 hits backfill L1 (no repeat L2 read), record envelope-length size stats, and survive a refused backfill.fresh_for=0.Summary
This PR improves L1 cache backfilling behavior and payload-size statistics accuracy on L2 cache hits (LAB-348).
Changes
Size stats now derive from envelope length on every hit path
The cache read methods (
get_cached_value,get_cached_value_async, and both freshness variants) now return an additionalsize_byteselement in their hit tuples. Previously the tuple shape was(True, value, raw_bytes); it is now(True, value, raw_bytes, size_bytes).The key motivation: on the mmap fast path,
raw_bytesis deliberatelyNone(the mapped view must never reach L1). Previously, size stats fell back to0in that case since there were no bytes to measure. Now the envelope's byte length is captured directly (viahandle.view.nbyteson the mmap path, orlen(cached_data)elsewhere), so payload-size metrics are accurate on every hit path — including mmap — without holding onto the bytes.The decorators (
sync_wrapperandasync_wrapper) were updated to unpack the newsize_bytesvalue and pass it directly to the stats recording, replacing the oldlen(cached_data) if cached_data else 0computation.Narrowed L1 backfill exception handling
In
_l1_backfill_from_l2, the broadexcept Exceptionwas narrowed toexcept TypeError. The only documented refusal fromL1Cache.putis aTypeErroron a non-bytes envelope from an out-of-contract backend, which is logged and skipped. Any other exception is now treated as a genuine L1 bug and allowed to propagate, rather than being silently swallowed.Tests
Updated unit tests across multiple files to reflect the new 4-element hit tuple shape, including assertions that verify
size_bytesis correctly populated on the mmap path (e.g.,handle.view.nbytes= 4096) even when the envelope isNone.Summary by CodeRabbit
Performance
Observability
Reliability