feat(api): add EtcdDefrag API type and docs - #362
feat(api): add EtcdDefrag API type and docs#362Andrey Kolkov (androndo) wants to merge 1 commit into
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Included review availability: Your plan includes up to 2 reviews per rolling hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds the ChangesEtcdDefrag API
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The API can currently accept a minReclaim value above the documented default free-space threshold when freeSpaceAbove is omitted, which may allow inconsistent defragmentation rules; merge is reasonable with explicit owner awareness and follow-up to align validation with the documented floor. Possibly related PRs
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✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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In `@api/v1alpha2/etcddefrag_types.go`:
- Around line 37-42: Mark TTLSecondsAfterFinished in
api/v1alpha2/etcddefrag_types.go as pending controller implementation, without
describing API-server self-GC; regenerate the CRD description in
charts/etcd-operator/crd-bases/etcd-operator.cozystack.io_etcddefrags.yaml; and
update docs/etcd-defrag.md to label the manifest and status output as
future-controller behavior and remove the self-GC claim.
- Around line 50-51: Normalize freeSpaceAbove and minReclaim with string()
before passing them to quantity() in the XValidation rules within EtcdDefrag
types, preserving the positivity checks. Regenerate
charts/etcd-operator/crd-bases/etcd-operator.cozystack.io_etcddefrags.yaml so
the corresponding CRD validation rules at lines 113-117 reflect the same change;
both sites require updates.
- Around line 114-119: Remove the processing-order claim from the Members field
documentation in MemberDefragStatus while retaining its map-list configuration
keyed by name. Regenerate the CRD schema in
charts/etcd-operator/crd-bases/etcd-operator.cozystack.io_etcddefrags.yaml so
the generated description matches the updated API documentation; update both
affected sites accordingly.
In `@docs/etcd-defrag.md`:
- Around line 19-26: Update the documentation text in “Why in the operator (not
a bare CronJob)” to refer to the existing etcdctl defrag command instead of the
undefined etcd-defrag wrapper, without changing the surrounding sequencing and
health guarantees.
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Timofei Larkin (lllamnyp)
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This is the right shape, and it answers what #361 was missing: a dedicated resource with .spec.clusterRef, the controller deferred so the API can be judged on its own, and EtcdClusterSpec left alone. status.members[] — per-member role, outcome, before/after DbSize, bytes reclaimed, as a listType=map — is a real improvement on a rolled-up condition plus an annotation, and gives a run genuine history. The rule redesign also fixes the worst correctness defect of the earlier approach in the API itself: making reclaimable space the always-applied floor, with minReclaim as the floor under quota pressure, is what stops a full-but-unfragmented backend from being defragmented hourly forever for nothing.
Codegen is clean (make generate manifests produces no drift, so the deepcopy and CRD are genuinely tool-generated), go build ./... passes, and helm template renders 4 CRDs.
Two things to change: the scheduling stance, and a validation bug.
Scheduling: the resource is right, the doc's conclusion isn't
docs/etcd-defrag.md:16-17 states that there is deliberately no schedule field because cadence is an external scheduler's job. That forecloses a decision that should go the other way.
Defragmentation needs to be expressible three ways — once, on a cadence, and when a condition is met. All three produce the same thing: a sweep across members with per-member outcomes and a terminal result. They differ only in what starts the sweep. So the split is between the run and what triggers a run — the Job/CronJob decomposition:
| What the user wants | How they say it |
|---|---|
| Once, now | Create an EtcdDefrag by hand |
| On a cadence | EtcdDefragPolicy with schedule |
| When a condition is met | EtcdDefragPolicy with when |
| On a cadence, but only if it's worth doing | EtcdDefragPolicy with both |
The last row is why this shape wins. Schedule and condition are not three modes, they are two independent predicates that compose, and the intersection — "at 03:00, and only if there is something to reclaim" — is what a careful operator actually wants. Neither predicate alone expresses it, and a oneOf trigger union inside a single kind would forbid it by construction.
apiVersion: etcd-operator.cozystack.io/v1alpha2
kind: EtcdDefragPolicy
spec:
clusterRef: {name: etcd}
schedule: "0 3 * * *" # optional: when we are allowed to act
when: # optional: whether it is worth acting
freeSpaceAbove: 200Mi
quotaUsageAbove: 80%
minInterval: 6h # floor between runs; only meaningful for `when`-only
suspend: false
concurrencyPolicy: Forbid # per-cluster serialization, in vocabulary users already know
template: # the EtcdDefrag that gets stamped out
spec:
rule: {freeSpaceAbove: 200Mi, quotaUsageAbove: 80%, minReclaim: 32Mi}
ttlSecondsAfterFinished: 3600
status:
lastScheduleTime: ...
lastSuccessfulTime: ...
active: {name: etcd-defrag-28f3a}schedule only means cron. when only means level-triggered, rate-limited by minInterval. Both means the schedule gates when the operator may look and when decides whether to bother. Neither should be rejected at admission (has(self.schedule) || has(self.when)), so a policy that can never fire cannot be created.
when and rule are not redundant, and the docs will need to say why. when decides whether to create a run at all — it is what stops a level-triggered policy from stamping out a no-op EtcdDefrag on every reconcile. rule decides which members a run actually touches, evaluated at execution time against live sizes. Different layers, different clocks: a run created at 03:00 may find the fragmentation already gone, and rule is what makes that a cheap no-op instead of three pointless stop-the-world calls.
Why two kinds rather than one with a trigger union: a single kind forces one status to serve two lifecycles. phase: Complete, completedAt, and ttlSecondsAfterFinished are meaningful for a one-shot and meaningless for a standing object; lastScheduleTime and active are the reverse. Half the status inapplicable depending on spec is the shape to avoid.
This also does not reintroduce what #361 was rejected for. That objection was to accumulating operational concerns inside EtcdClusterSpec. Two small single-purpose kinds with clean lifecycles is the opposite — and it removes the external CronJob that the current doc requires, which is burden the operator should be absorbing rather than handing back.
On naming: prefer EtcdDefragPolicy over EtcdDefragSchedule. It holds a condition as well as a cadence, so Policy is the honest name, and it avoids echoing the EtcdSnapshotSchedule the README rules out.
What this changes in this PR: structurally, nothing. EtcdDefrag as proposed is already the run type in all four rows above — clusterRef, rule, ttlSecondsAfterFinished, terminal phases, and status.members[] make it a clean Job-analog. What changes is:
docs/etcd-defrag.md:16-17should say a policy kind follows, not that external-only scheduling is deliberate and permanent.- The owner-reference question below stops being optional: policy-created runs need one, both for garbage collection and so
concurrencyPolicycan find the active run. README.md:79currently advertises the doc as covering defragmentation "one-shot and scheduled", while the README's own feature list still says "No defragmentation scheduling". That becomes true rather than aspirational once the policy kind exists; until then, drop "and scheduled".
Blocking
Both new CEL rules reject integer-form quantities with a raw type error
api/v1alpha2/etcddefrag_types.go:50-51 call quantity(self.freeSpaceAbove) and quantity(self.minReclaim) directly. Every other quantity() call in this repo coerces first — quantity(string(self.storage.size)) in etcdcluster_types.go:376 and :429. Because these are int-or-string fields, integer input matches no overload. Verified against a real apiserver with the repo's envtest harness on Kubernetes 1.33:
| Input | Result |
|---|---|
freeSpaceAbove: "200Mi" |
accepted |
freeSpaceAbove: 200 |
rejected — 'no such overload: quantity(int)' |
freeSpaceAbove: 0 |
rejected with the same overload error, not the intended message |
minReclaim: 32 |
rejected — 'no such overload: quantity(int)' |
A plain byte count is a legitimate Quantity, so freeSpaceAbove: 209715200 fails with an incomprehensible CEL error that has "freeSpaceAbove must be greater than 0" glued onto the end of it.
This exact path already has a named regression test on EtcdCluster — TestCEL_StorageMustBeNonZero_IntegerInput in api/v1alpha2/cel_validation_test.go — whose comment spells out that quantity() requires a string and that omitting string() trips a "no such overload" runtime error instead of the intended human-readable message. Fix is quantity(string(...)) in both rules, plus the equivalent integer-input test for EtcdDefrag.
Ship order: this releases an inert CRD and a doc written in the present tense
The chart auto-globs crd-bases/, so the next chart release installs etcddefrags with nothing reconciling it — someone creates one during an incident and gets silence. docs/etcd-defrag.md:3-5 carries a status banner, but the sections that follow ("Safety model", "Timeouts and retries") describe guarantees in the present tense as though they exist.
Either stack the controller and land them together, or: move the inert warning into the Go type's godoc so it reaches kubectl explain, and mark those two sections as planned behaviour.
Non-blocking, worth fixing
rule: {} and an absent rule mean opposite things. Per the godoc, omitting rule means "defragment every member unconditionally" (etcddefrag_types.go:31-33), while rule: {} gets the 200Mi default gate (:55). Both are accepted. So the present-but-empty object is the safe form and omission is the aggressive one — the inverse of the usual reading, and a trap for any chart or GitOps template that emits rule: {} when its values block is empty. Consider an explicit rule.all: true, or requiring rule outright, so "unconditional" is something the user says rather than something they get by leaving a key out.
spec.clusterRef with an empty name is accepted. Both clusterRef: {} and clusterRef.name: "" pass admission: required: [clusterRef] only requires the object, and corev1.LocalObjectReference.Name carries default: "". This is inherited rather than invented — EtcdSnapshot.spec.clusterRef has the identical weakness — but this CRD is being defined right now, so a self.clusterRef.name != '' rule is free here, where changing EtcdSnapshot later is a separate conversation.
Two rule combinations are accepted but incoherent. minReclaim with no quotaUsageAbove is a silent no-op: it floors an arm that was never enabled. And minReclaim: 1Gi alongside freeSpaceAbove: 200Mi is accepted, which inverts the field's purpose — under quota pressure the gate becomes stricter than normal. One CEL rule each.
Smaller things:
Outcome,Role, andReason(etcddefrag_types.go:129-142) are bare strings whose valid values live only in prose, whilePhasegets typed constants. Define them now so the follow-up controller and any consumer share one source.Deferredas a phase overlapsPending— both mean "not acting yet" — and forces every consumer to know it is non-terminal. It may read better as a condition on aPendingobject.ttlSecondsAfterFinishedis well named and well motivated for scheduler-created objects, butEtcdSnapshothas no equivalent. If it is right here it is probably right there; the two record types now diverge.- Nothing specifies what happens to
EtcdDefragrecords when theirEtcdClusteris deleted. An owner reference would collect them; TTL will not, since it only fires after a terminal phase and aPendingorphan never reaches one.
Coordination
DefragRule is declared in api/v1alpha2 by both this PR and #361, so they cannot both merge. Since this supersedes that approach, #361 should be closed rather than left open.
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Introduces a dedicated EtcdDefrag resource for operator-driven backend defragmentation, instead of the spec.defrag-in-EtcdClusterSpec shape rejected in #361's review. One-shot and run-to-completion, modeled on EtcdSnapshot: spec.clusterRef, a rule (reclaimable floor so a full-but-unfragmented backend isn't defragmented for nothing; rule.all for explicit unconditional), and a status carrying per-member outcomes. Lands the API type, generated deepcopy/CRD, and user docs so the reconciling controller can follow as a self-contained change. The resource is inert until that controller lands (documented in the type godoc and the doc). No changes to EtcdClusterSpec. Review fixes: quantity(string(...)) coercion on the rule quantities (integer input tripped a "no such overload" CEL error) + an integer-input regression test; CEL guards for clusterRef.name, minReclaim<=freeSpaceAbove, minReclaim requires quotaUsageAbove, and rule.all exclusivity; typed Outcome/Role; dropped the Deferred phase (deferral is a condition on Pending); docs reframe scheduling around a planned EtcdDefragPolicy rather than "external-only, permanent", mark controller-contract sections as planned, and use `etcdctl defrag`. Refs #221, #357; supersedes the #361 approach. Assisted-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Signed-off-by: Andrey Kolkov <androndo@gmail.com>
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@api/v1alpha2/etcddefrag_types.go`:
- Around line 54-58: Update the validation rules on the EtcdDefrag type so
minReclaim is compared against quantity('200Mi') when freeSpaceAbove is omitted,
while retaining the existing comparison when freeSpaceAbove is provided.
Regenerate the CRD manifests and add an admission test covering quotaUsageAbove
"80%" with minReclaim 201Mi.
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README.mdapi/v1alpha2/cel_validation_test.goapi/v1alpha2/etcddefrag_types.gocharts/etcd-operator/crd-bases/etcd-operator.cozystack.io_etcddefrags.yamldocs/etcd-defrag.md
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- README.md
- docs/etcd-defrag.md
- charts/etcd-operator/crd-bases/etcd-operator.cozystack.io_etcddefrags.yaml
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Timofei Larkin (lllamnyp)
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Everything raised earlier is addressed: quantity(string(...)) in both rules with an integer-input test alongside the existing EtcdCluster one, a non-empty clusterRef.name, rule.all replacing the absent-versus-empty inversion (with CEL keeping it exclusive of the thresholds), minReclaim gated on quotaUsageAbove and bounded by freeSpaceAbove, typed DefragOutcome/MemberRole, Deferred demoted from a phase to a condition, and the inert-until-the-controller-lands warning where kubectl explain will show it.
The scheduling section now reads correctly: EtcdDefrag is the run, a companion EtcdDefragPolicy carrying a cadence and/or a condition is planned to trigger runs, and neither is foreclosed by what ships here.
Codegen is drift-free and helm template renders the CRD set. Land this ahead of #361, which stacks on it and removes the inert warnings as the controller arrives.
2 participants
Adds a dedicated
EtcdDefragresource for operator-driven backend defragmentation — the Option B shape from the review on #361 (which accepted the defrag mechanism but rejected hosting it asEtcdClusterSpec.defrag).This PR lands the API type + generated deepcopy/CRD + user docs only, so the reconciling controller can follow as a self-contained change with no API churn at that point. Until the controller lands the resource is inert (documented as such). No changes to
EtcdClusterSpec.What's here
api/v1alpha2/etcddefrag_types.go—EtcdDefrag(+List),EtcdDefragSpec{clusterRef, rule?, ttlSecondsAfterFinished?},DefragRule,EtcdDefragStatuswith per-memberstatus.members[], phasePending→Running→Deferred→Complete|Failed. Registered in the scheme.zz_generated.deepcopy.goand theetcddefragsCRD (chart auto-globscrd-bases/, so it renders with no manual wiring —helm templateshows 4 CRDs,helm lintclean).docs/etcd-defrag.md+ a README link.Shape, briefly
EtcdSnapshot. Recurring is driven externally (aCronJobcreating objects), matching the repo's deliberate lack ofEtcdSnapshotSchedule. This removes fields that were defect sources in feat(defrag): EtcdDefrag controller (stacked on the EtcdDefrag API) #361: noschedule(cadence is the scheduler's), nominInterval.rulebakes in a reclaimable floor (freeSpaceAbove, andminReclaimunderquotaUsageAbovepressure) so a full-but-unfragmented backend isn't defragmented forever for nothing — the correctness fix expressed in the API, with CEL validation on the numeric fields.status.members[]holds per-member role/outcome/before-after size/reclaimed — history/observability as first-class status, not a condition + annotation.Deliberately out of scope
Leader/Errors/agreement,MoveLeaderbefore the leader,NOSPACEdisarm, per-cluster serialization, no-op backoff) is written up in the doc so the API is judged against real semantics.Refs #221, #357; supersedes the
spec.defragapproach in #361.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
EtcdDefragresource for one-time etcd defragmentation requests.Documentation