fix(opensearch-operator): keep a single-replica cluster electable after bootstrap - #4231
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe change adds OpenSearch voting-exclusion handling, builds a patched operator image, derives the operator version from the Dockerfile, updates Helm values from the built image digest, and invokes the operator image build from the root build target. ChangesOpenSearch operator image and bootstrap handling
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Reconciliation
participant OsClusterClient
participant OpenSearch
participant KubernetesAPI
Reconciliation->>OsClusterClient: Exclude bootstrap node
OsClusterClient->>OpenSearch: Update voting exclusions
Reconciliation->>OsClusterClient: Verify committed voter state
OsClusterClient->>OpenSearch: Read cluster state
Reconciliation->>KubernetesAPI: Delete bootstrap pod
Reconciliation->>OsClusterClient: Clear voting exclusions
Merge Risk: ⚪ Minimal · up to The operator build publishes or exports its image through the shared build configuration, and bootstrap exclusion cleanup retries safely. No concrete merge-blocking issue remains. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Direct issue [ Full details: Out of Scope Changes checkExplanation The pull request adds OpenSearch-specific files, image build logic, Helm image configuration, and bootstrap voting-exclusion behavior. These changes have no demonstrated connection to the directly linked SeaweedFS issue [
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In
`@packages/system/opensearch-operator/images/opensearch-operator/patches/bootstrap-voting-exclusion.diff`:
- Around line 211-213: The retireBootstrapPod flow must requeue when
ClearVotingConfigExclusions fails, and retry that cleanup after GetPod reports
NotFound instead of returning without clearing exclusions. Preserve the default
wait_for_removal=true behavior and the existing protection against clearing
exclusions while excluded nodes remain active.
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Makefilepackages/system/opensearch-operator/Makefilepackages/system/opensearch-operator/images/opensearch-operator/Dockerfilepackages/system/opensearch-operator/images/opensearch-operator/patches/bootstrap-voting-exclusion.diff
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Aleksei Sviridkin (lexfrei)
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Aleksei Sviridkin (lexfrei)
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NOT LGTM — the image ref your description says this PR would commit is missing, so the tree renders the stock upstream operator.
Business context: a single-replica OpenSearch cluster loses its only voter when the operator retires the bootstrap pod.
Blockers
B1: manager.image is missing from values.yaml
File: packages/system/opensearch-operator/values.yaml
This is the second commit your "Before this can merge" section describes: "Once the first build here publishes it, I will add repository plus tag@sha256:... in a second commit and take the PR out of draft." The PR is out of draft and that commit is not there.
Evidence: at e774fc11 the manager block holds only replicaCount and watchNamespace. The vendored chart defaults manager.image.repository to opensearchproject/opensearch-operator and leaves tag: "", which falls back to .Chart.AppVersion, pinned at 2.8.0 in Chart.yaml. Rendering it rather than reasoning about it:
$ helm template test packages/system/opensearch-operator | grep 'image: "opensearchproject'
image: "opensearchproject/opensearch-operator:2.8.0"
Two things follow. Installing from the tree gets the stock upstream operator, so the voting fix is absent exactly where the bug bites. And hack/lib/image-refs.sh collects first-party refs by walking packages/*/*/values.yaml for @sha256:, so with nothing there the image stays outside promote, retag, mirror and candidate-verify.
Fix: commit the block make image already generates, same shape as packages/system/redis-operator/values.yaml:
opensearch-operator:
manager:
image:
repository: ghcr.io/cozystack/cozystack/opensearch-operator
tag: v2.8.0@sha256:59a3d0484c24e86307cc29631dc3acc517f815fd3bb784eab706449537aba161That digest is what this PR's build published. It is content-addressed, so it holds whichever registry serves it.
Notes
This does not reach CI. make image rewrites values.yaml during the build and the release build runs the same make build, so both the e2e artifact and a release carry the patched operator. Whatever the e2e lane reports is evidence about the fix itself.
The image repository is public and readable, so nothing needs a visibility change before the image can be pulled.
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Where this stands, because the run that just finished does not say what it looks like it says. Attempt 3 came back red on Two things move it, and the order matters:
Is anything blocking the rebase on your side? |
…er bootstrap The operator deletes the bootstrap pod as soon as initialization completes and never looks at the voting configuration first. With one cluster_manager replica there are exactly two eligible nodes, OpenSearch keeps the configuration at an odd size of one, and the voter it keeps is the bootstrap node that formed the cluster. Deleting that pod takes away the only vote there was, and the survivor can never hold an election again, because changing the configuration itself needs a quorum. The cluster is unusable about a minute after it installs, and a node with no cluster-manager still answers the readiness probe, so nothing says so until something restarts the pod. Build the operator in-tree, the way kamaji and redis-operator already are, and carry a patch that excludes the bootstrap node from the voting configuration and waits for that to commit before deleting the pod. Reaching the cluster is a precondition rather than a nicety: every failure keeps the pod and requeues, because a bootstrap pod that outlives its purpose costs a pod, while a cluster that cannot elect does not recover without a human. Deleting a pod is a request rather than a wait, so clearing the exclusion afterwards can find the node still in the cluster and fail. That path requeues and is retried once the pod is really gone, which keeps a stale entry out of the capped exclusion list; clearing stays at the API default wait_for_removal=true so it cannot re-admit a node some other operation is still draining. Upstream carries the same defect, tracked as opensearch-project/opensearch-k8s-operator#1448. Assisted-by: LLM Signed-off-by: IvanHunters <[email protected]>
e774fc1 to
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Aleksei Sviridkin (lexfrei)
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LGTM — the image reference landed and the suite this change exists to fix is green.
The render gives the patched operator now:
$ helm template test packages/system/opensearch-operator | grep 'image: "ghcr'
image: "ghcr.io/cozystack/cozystack/opensearch-operator:v2.8.0@sha256:cbe6b50f13aa5abf338209d38dfcd80e73296e97510465b5fca73a0130bfaad7"
I checked that digest is a build of this revision and not the earlier one: the manager binary behind it defines IsVotingConfigExcluded and clearBootstrapExclusion, and the patch only grew those two in this push. collect_image_refs picks the ref up through the same values shape redis-operator uses, so promote, retag and mirror all see it.
opensearch passes in 358s. On a run from the same hour on another branch it still dies in verify-statefulset-rolled-onto-the-new-mount-plan at 988s, which is the failure this change is for. The job is red overall on kafka and clickhouse-2-backup-roundtrip: the strimzi entity-operator crashlooped on its probes until the test hit its deadline, and the altinity operator went into BackOff and never created the keeper StatefulSet. Both of those suites pass on that other run, and neither touches anything here.
Non-blocking:
bootstrapRetireRetry is inert. retireBootstrapPod returns RequeueAfter: 10s with Requeue left false, CombinedResult.Combine copies Requeue only when the sub-result sets it, and reconcilePhaseRunning returns early only on err != nil || result.Requeue. Unless something else in the same reconciler requeues, the loop runs on and ends at its own 30s, so the real wait is 30 seconds.
Once the pod is gone retireBootstrapPod still runs on every pass and takes the podGone branch, which builds a cluster client (secret read, ping, main page) and then reads /_cluster/state. Three requests per cluster every 30 seconds, and it does not stop: Status.Initialized only goes back to false in checkForEmptyDirRecovery, which PVC-backed pools never reach. That path made no calls at all before.
A chart test would have caught the first revision. With manager.image missing the render quietly falls back to the upstream operator, and one assertion that the deployment image starts with ghcr.io/cozystack/cozystack/opensearch-operator and carries @sha256: fails loudly instead. It survives make image rewriting the tag on every build.
Also the PR body still says values.yaml deliberately carries no manager.image and that a second commit will add it. That commit is this one.
Aleksei Sviridkin (lexfrei)
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Aleksei Sviridkin (lexfrei)
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LGTM, unchanged. One correction to my earlier review.
The digest I gave there, sha256:59a3d0484c24e86307cc29631dc3acc517f815fd3bb784eab706449537aba161, is the pull-request registry copy and returns 404 in ghcr, so pinning that block verbatim would have given a reference nothing can pull. The value committed here is the right one. The two differ because they are separate builds, not because anything is wrong.
…econciler a stall sits in (#4377) # Description Backport of #4333 to `release-1.6`, together with #4231 which it depends on. 1.6 has no in-tree opensearch-operator build, so bot draft added only the Dockerfile and patch from #4333 would never reach an image. #4231 brings the build (`image` target, values wiring, root `Makefile` entry) plus its own single-replica fix. In root `Makefile` I kept only opensearch-operator line, redis-operator is not built in-tree on 1.6. I built image locally, both patches apply to operator v2.8.0 and stall watchdog specs from #4333 pass.
A hand backport that carries more than one change names all of them in one phrase -- "Backport of #3938 and #4280", or "Backport of #4253 to `release-1.6`, together with #3460" for a dependency pulled along -- and the audit read only the first number after "Backport of". The rest were linked to nothing. A labelled original in second place then read as MISSING while its backport PR was still open, instead of pending, and once that PR merged it counted as landed only if the branch history happened to prove it. Read the whole reference list the phrase carries, and the together-with form this repository writes. A list counts in full only when it visibly ends: at the end of the line or the sentence, or where a "to release-X.Y" clause names the target line, with the line name a whole word: release-1.6-fixes, release-1.6.1 and release-1.6.fixes are not lines, so punctuation after the name ends it only when a space or the end of the text follows. One that runs on into anything else -- "Backport of #10, #20 is not included", or "#10, #20 to follow in a separate PR" -- may be saying something about its later items, so only its first reference, the one the phrase names directly, is kept. The issue a backport fixes, or a CI run it cites further on in the body, is never taken for an original. A reference qualified with another repository is now skipped instead of read as a local number. That also tightens the old first-number rule, which accepted any owner/repo prefix: "Backport of other/repo#20" linked local #20, so a merged backport of something unrelated could turn that PR's MISSING verdict into backported. Only a bare #N or one qualified with the repository the backport PR itself lives in, compared without regard to case, is an original. Over every PR on release-1.4, release-1.5 and release-1.6 this changes the links of exactly four: #4456 and #4421 each gain #4280, #4377 gains #4231 and #4328 gains #3460. No verdict moves today, since none of the added originals carries a backport label. Assisted-by: LLM Signed-off-by: Myasnikov Daniil <[email protected]>
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What this PR does
Builds the OpenSearch operator in-tree, the way kamaji and redis-operator already are, and carries one source patch.
The operator deletes its bootstrap pod the moment
status.initializedflips, without looking at the voting configuration. Withreplicas: 1there are exactly two cluster-manager-eligible nodes, OpenSearch keeps the voting configuration at an odd size of one, and the voter it keeps is the bootstrap node that formed the cluster. Deleting that pod takes away the only vote there was, and the survivor can never hold an election again, because changing the voting configuration itself needs a quorum. Full write-up in #4230.The patch excludes the bootstrap node from the voting configuration before the pod goes, and confirms the exclusion committed before deleting anything:
POST /_cluster/voting_config_exclusions?node_names=<release>-bootstrap-0. Fails: requeue, keep the pod.DELETE /_cluster/voting_config_exclusions. Fails: log and carry on, the pod is already gone and the list is only capped, not load-bearing.Step 4 is the one place this differs from the upstream attempt, which relies on the POST being blocking. I did not verify that property, and polling the committed configuration is correct whether or not it holds.
Every failure to reach the cluster keeps the bootstrap pod and requeues. That is a deliberate trade: a bootstrap pod outliving its purpose costs one pod, a cluster that cannot elect a cluster-manager needs a human.
How the values were arrived at
Not from the documentation. Reproduced outside Kubernetes first, two containers with the env the operator sets,
cluster.initial_master_nodespointing at the first:Without the exclusion, removing the first container leaves the second printing
cluster-manager not discovered or elected yet, an election requires a node with id [...]forever, which is the same sentence the e2e run produced.Why carry it here rather than wait
Upstream knows: opensearch-k8s-operator#1448 is open with
release-blocker, and its third point is this exact case. Three PRs address it and none looks close: #1483 has changes-requested, a merge conflict and a red lint; #1150 and #1430 have not moved since July. When a release carries the fix, this patch and this image build come back out.The alternative considered and rejected was refusing
replicas: 1invalues.schema.json. It is a breaking change for existing releases and removes a configuration rather than fixing it.Before this can merge
values.yamldeliberately carries nomanager.imageyet. The image does not exist, and committing a first-party reference without a digest is exactly whatdocs/agents/image-refs.mdforbids. Once the first build here publishes it, I will addrepositoryplustag@sha256:...in a second commit and take the PR out of draft.Note on CI cost
Adding the build line to the root
Makefileputs it infull_rebuild_pattern, so every push to this branch rebuilds all 28 units rather than one. Verified withhack/build-matrix.sh. Unavoidable: the line is what puts the image in the matrix at all.What was checked locally
/manager --helpruns from the built image.go build ./...,go vetand the operator's ownpkg/reconcilerstests pass with the patch applied.gofmtclean,helm unittestfor the package green,pre-commitgreen on the changed files.hack/build-matrix.shselects the package for a package-only change.Not checked locally, and the reason this needs the e2e lane: that the fix actually keeps a real cluster electable. The
opensearchchainsaw suite is the test for it.Screenshots
Not a UI change.
Downstream repositories
Release note
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