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rustfs/docs
Chris d2eda195e6 fix(decommission): defer source cleanup quorum failures (#8760)
* fix(decommission): defer source cleanup quorum failures

A quorum failure while deleting the source of an already copied entry
was fatal and marked the whole pool failed, although the copied source
is still in place and an uncommitted delete transaction is settled by
delete recovery. Carry the cleanup error typed and resolve a quorum
failure as Deferred: the entry is replayed at the end of the round, and
a deferral that persists takes the existing capacity-blocked pause path
instead of a terminal failure. Other cleanup errors and quorum errors
from other stages stay terminal.

Add set-level regressions for parent and child keys (`a/b`, `a/b/c`):
parent cleanup leaves every child file untouched, and parent cleanup
reaches quorum while the child is cleaned up or rewritten concurrently.

* test(ecstore): keep source cleanup errors typed in prefix cleanup tests

Return SourceCleanupError from the test helper instead of formatting it
into Error::other, and shrink the error(format!) ratchet baseline for
core/pools.rs, which lost one call site in the cleanup failure change.

* fix(decommission): retry cleanup quorum failures and count replays once

Retry a source cleanup quorum failure in place, up to three attempts
with the existing source-cleanup backoff, before deferring the entry.

Carry the versions an entry already counted on its deferral, so the
end-of-round replay does not add a fully counted entry to
items_decommissioned and bytes_done again.

A deferral that persists pauses the pool through the existing deferred
drain path. When source cleanup caused it, persist a reason led by
"source cleanup blocked" without the carrier error's free-drive wording,
and report waitingReason "source_cleanup" instead of "capacity".

Add a source_cleanup test fault stage and a routine test that drives a
cleanup quorum fault through deferral and replay to completion.

* fix(decommission): wait seconds between cleanup quorum retries

Give the in-place source cleanup quorum retry a fixed floor of one and
then two seconds, with the existing jitter on top, so it can ride out a
drive reconnect or health-check blip instead of retrying within a few
hundred milliseconds. The wait stays bounded and cancel-safe.

Find a source cleanup pause reason through stage wrappers, as the
capacity-blocked check does, and add a routine test where cleanup keeps
losing quorum: the decommission pauses with a source cleanup reason, the
bucket stays queued and the source stays in place.

Document the additive waitingReason value source_cleanup and its
compatibility with older nodes reading the same pool.bin.

* fix(decommission): never retry a lost source cleanup fence

The cleanup retry classifier used is_quorum_error(), which also matches
NamespaceLockQuorumUnavailable. The delete commit fence reports a lost
namespace lock or mutation fence with that variant, so a lost fence was
retried in place and only stopped later at the pre-cleanup fence check.

A lost fence means this worker no longer owns the key; it must stop
without retrying. Retry and defer only drive quorum failures:
ErasureReadQuorum, ErasureWriteQuorum, InsufficientReadQuorum and
InsufficientWriteQuorum.

---------

Co-authored-by: Hauser <housemecn@gmail.com>
2026-10-21 20:30:22 +09:00
..

Documentation

Use the focused indexes rather than treating this directory as an unordered collection:

Operations

For PUT cleanup admission, blocking-pool isolation, and optional CPU affinity, see PUT cleanup isolation.

For the logical per-operation io_uring read cap, see io_uring read chunk size.

For bounded local read-backend startup and cancellation, see io_uring backend initialization.

For legacy protection assessment and bounded protected copies, see Object integrity inventory, audit, and migration.

For encrypted listing compatibility and older stored fingerprints, see Encrypted object ETags.

For durable hard quota accounting, node-outage behavior, and fence protocol upgrades, see Durable hard quotas.

Operational runbooks live under operations/. Replication operators should start with:

Runbook Use it for
Site replication operations Health fields, pending operations, outage recovery, re-pair admission, IAM/SSE boundaries, and upgrades.
Replication target check Validating an S3 destination and version fidelity before enabling replication.
Replication object size limits Multipart routing, large-object limits, and retry characteristics.
Replication outbound transport Integrity headers, generic target behavior, and transport knobs.

For the erasure-coded cluster lifecycle (planning, parity and EC:0, expansion, rebalance, decommission, heal, drive replacement, restart recovery, and the rc CLI mapping), start with Cluster and erasure-coding lifecycle operations.

For concurrent bucket creation and deletion, see Bucket operation admission.

For persisted administrator bucket tasks and bucket recreation, see Bucket heal recovery.

For interrupted object deletions and returning drives, see Delete transaction recovery.

For disk replacement across VM restarts and schema 5/6 maintenance migration, see Replacement generation recovery.

For historical GET timeouts during PUT or Heal, see Object lock contention diagnostics.

Other runbooks remain grouped by filename in operations/; architecture pages link to the relevant runbook where a cross-boundary procedure is required.

For storage dashboards, see Storage metrics and observer selection: drive ownership, snapshot freshness, counter queries, and rolling upgrades.

For per-bucket capacity and object counts, see Bucket usage metrics: OTLP export, cluster deduplication, accounting semantics, and scanner freshness.

For optional shard commitments, see Independent shard integrity rollout: activation, legacy repair results, multipart mode changes, and rollback limits.

For crates.io publication of workspace crates, see Workspace Cargo Publish: dependency ordering, dry-run, publish, and failure handling.