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Tier / ILM Debugging

.agents/skills/tier-debug/SKILL.md

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Tier / ILM Debugging

Full playbook: docs/operations/tier-ilm-debugging.md — read it before changing tier code.

Quick moves:

bash
# Inspect transition metadata on disk (one xl.meta per erasure shard disk)
cargo run -p rustfs-filemeta --example dump_fileinfo -- "/path/to/{bucket}/{object}/xl.meta"

# Trace what versionId is sent to the remote tier
RUST_LOG=rustfs_ecstore::bucket::lifecycle=debug ./target/debug/rustfs …

Interpretation:

  • transition_ver_id: <none> → correct for an unversioned tier bucket; no versionId must be sent on tier GET/DELETE.
  • transition_ver_id: 00000000-… (nil) → corrupt legacy write-back; readers must filter it out, never send it.
  • Empty-string transitioned-versionID metadata under both x-rustfs-internal-* and x-minio-internal-* keys → object went to an unversioned tier bucket.

Code entry points: crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs (ILM actions), crates/ecstore/src/services/tier/ (warm backends), crates/filemeta/src/filemeta/version.rs (metadata read/write + regression tests).