Feng Ruohang
9b76a21675
Reverse the first-parent diff of a3df317ae0,
including the feature branch compatibility and mover follow-up fixes.
Retain the independent multi-pool correctness fixes from #178 and migrate
their shared test fixture away from access-tier code.
Tolerate retired ILM keys and XML, read old v9 statistics while writing v8,
and document migration without moving objects or rewriting their metadata.
Include regression coverage using a historical scanner/writer v9 fixture.
Signed-off-by: Feng Ruohang <rh@vonng.com>
Data-usage v9 retirement fixture
Generated using unmodified scanDataFolder and dataUsageCache.serializeTo from
Server commit 89637554d60c27cfc51d2281d0a4fe15e415f06d (Go 1.27.1, darwin/arm64).
The scanner visits three real local files; its size callback supplies synthetic
version/delete-marker/remote-tier summaries, following TestDataUsageCacheSerialize.
It is a scanner/cache compatibility fixture, not a distributed object-store test.
The old scanner counts 74,962 bytes, 3 objects, 5 versions and 2 delete markers.
Its nonzero retired hts totals 9,426 bytes. Remote tier COLD contains 65,536
bytes, one version and one object. The cache includes nested children, both
histograms, a fixed timestamp and scanner cycle 42. The JSON is the old scanner's
complete expected cache (including HotTierSize, which the new reader ignores).
Binary SHA-256: 4c9c7e94cea7758fe9b498b19f639188764b2787582783e6cc950f2c44d52a8b.
To regenerate, create a detached worktree at that exact source commit, copy
generate.go.txt to cmd/retirement-fixture_test.go, and run:
SILO_RETIRE_FIXTURE_DIR=/absolute/output/directory go test ./cmd -run '^TestGenerateAccessRetirementV9Fixture$' -count=1 -v
The historical production writer adds the version byte, compresses with zstd
and encodes msgp, including the nonzero hts field. Do not regenerate using the
retired implementation or by changing the header of a v8 payload. Map order may
change serialized bytes across regeneration; compare the decoded full cache.