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fix(admin): wait before scanning memory purge index - #1404
andreclaro wants to merge 2 commits into
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Ristretto Set/SetWithTTL return once the write is buffered, and trackKey runs at that point. DeleteByPattern used Get as a liveness check and untracked misses, so a concurrent purge (including dryRun) could drop a not-yet-applied key from hashIndex permanently. Flush buffered Sets with Wait first, and stop using Get for liveness — OnEvict/OnReject already clean the index, and Del on a missing orphan is a no-op.
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| // runs at that point. A Get-based liveness check in that window would miss | ||
| // and untrack the key permanently (OnEvict/OnReject never fire for a key | ||
| // that was never applied). Del on a missing orphan is a no-op. | ||
| m.cache.Wait() |
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Wait
When a buffered Set is rejected or evicted before Set calls trackKey, its callback can delete the index entry first, leaving trackKey to add a stale entry afterward; the previous liveness check handled this Set↔OnEvict race. Wait() drains pending writes but does not repair such orphans, so the scan can count missing keys as matched or deleted, including in dry-run results. Retain a liveness check that does not record a cache hit, or otherwise synchronize index updates with eviction callbacks.
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Good catch — kept Wait(), restored orphan cleanup with GetTTL (no TinyLFU/hit metrics). Pushed in the latest commit.
Wait() drains buffered Sets so a liveness check no longer false-misses keys that are still applying. Restore orphan cleanup with GetTTL (not Get) so Set↔OnEvict/OnReject stale index entries are dropped without bumping TinyLFU frequency or hit metrics, keeping dry-run counts honest.
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Summary
MemoryConnector.DeleteByPatterntreated a RistrettoGetmiss as proof thekey was gone and removed it from
hashIndex.Set/SetWithTTLonly bufferthe write, and
trackKeyruns at buffer time, so a concurrent purge(including
dryRun) could permanently drop a live key from the index.Flush pending Sets with
Wait()before scanning, and stop usingGetforliveness.
OnEvict/OnRejectalready keep the index in sync;Delon amissing orphan is a no-op. Avoiding
Getalso prevents dry-run from bumpingTinyLFU frequency / hit metrics.
Test plan
go build ./data/...go test ./data/ -run 'TestMemory|TestMatchUnsuffixed|TestHoldPurge|TestPurgeConnectors|TestBuildPurge|TestGlob|TestPhysicalKey|TestRvi'Made with Cursor