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k8ssandra-operator in CrashLoopBackOff during Kubernetes upgrade #1454

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c3-clement opened this issue Nov 22, 2024 · 3 comments · May be fixed by #1462
Open

k8ssandra-operator in CrashLoopBackOff during Kubernetes upgrade #1454

c3-clement opened this issue Nov 22, 2024 · 3 comments · May be fixed by #1462
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@c3-clement
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c3-clement commented Nov 22, 2024 •
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What happened?

We had a K8ssandra cluster with Medusa enabled deployed in AKS 1.29.
Cluster admin upgraded AKS to 1.30, and after that k8ssandra-operator was in CrashLoopBackOff and the K8ssandra pods were not starting.
K8ssandra pods started finally 4h30 after the AKS upgrade.

Did you expect to see something different?

I expect a Kubernetes upgrade to not causes k8ssandra unavailibity.

How to reproduce it (as minimally and precisely as possible):

  1. Deploy an AKS cluster 1.29
  2. Deploy k8ssandra-operator v1.14
  3. Deploy a K8ssandra cluster with at least 3 replicas and Medusa backup enabled
  4. Create a MedusaBackupSchedule or create MedusaBackupJobs
  5. Delete the nodepool containing Cassandra pods, so that all Cassandra pods will be evicted
  6. k8ssandra-operator should crash when it attempts to reconcile a MedusaBackupJob for this k8ssandra cluster
  7. Create a new 1.30 nodepool

Environment

  • K8ssandra Operator version:
    1.14.0

  • Kubernetes version information:
    1.29 -> 1.30

  • Kubernetes cluster kind:
    AKS

  • Manifests:

K8ssandraCluster manifest (after recovery):

apiVersion: k8ssandra.io/v1alpha1
kind: K8ssandraCluster
metadata:
  annotations:
    k8ssandra.io/initial-system-replication: '{"cs-1855ea8cc2":3}'
  creationTimestamp: "2023-08-15T18:06:51Z"
  finalizers:
  - k8ssandracluster.k8ssandra.io/finalizer
  generation: 3236
  name: cs-1855ea8cc2
  namespace: qaazv8dow
  resourceVersion: "348869397"
  uid: 6ffc08c2-d358-4f3b-a102-e99dbd396651
spec:
  auth: true
  cassandra:
    datacenters:
    - config:
        cassandraYaml:
          audit_logging_options:
            enabled: true
          commitlog_directory: /c3/cassandra/data/commitlog
          data_file_directories:
          - /c3/cassandra/data/data
          saved_caches_directory: /c3/cassandra/data/saved_caches
        jvmOptions:
          gc: G1GC
          heapSize: 12G
      containers:
      - args:
        - -c
        - tail -n+1 -F /c3/cassandra/logs/system.log
        command:
        - /bin/sh
        image: prodqaacr.azurecr.io/bundled-cassandra-jre-bcfips:4.0.12-r1-202407171520
        imagePullPolicy: Always
        name: server-system-logger
        resources: {}
        volumeMounts:
        - mountPath: /c3/cassandra
          name: server-data
      - args:
        - mgmtapi
        command:
        - /docker-entrypoint.sh
        name: cassandra
        resources: {}
        volumeMounts:
        - mountPath: /c3/cassandra
          name: server-data
      - env:
        - name: MEDUSA_TMP_DIR
          value: /c3/cassandra/medusa/tmp
        name: medusa
        resources: {}
        volumeMounts:
        - mountPath: /c3/cassandra
          name: server-data
      initContainers:
      - command:
        - /usr/local/bin/entrypoint
        image: prodqaacr.azurecr.io/bundled-cassandra-jre-bcfips:4.0.12-r1-202407171520
        imagePullPolicy: Always
        name: server-config-init
        resources: {}
      - env:
        - name: MEDUSA_TMP_DIR
          value: /c3/cassandra/medusa/tmp
        name: medusa-restore
        resources: {}
        volumeMounts:
        - mountPath: /c3/cassandra
          name: server-data
      metadata:
        name: cs-1855ea8cc2
        pods:
          labels:
            azure.workload.identity/use: "true"
            c3__app-0: 0c30
            c3__app_id-0: 0qaazv8dow-c3-c30
            c3__cluster-0: 0qaazv8dow0
            c3__created-0: 02023-12-13T00_3A42_3A42.127Z0
            c3__created_by-0: 0worker0
            c3__created_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
            c3__env-0: 0c30
            c3__env_id-0: 0qaazv8dow-c30
            c3__func-0: 0k8sc3cass0
            c3__id-0: 0qaazv8dow-c3-c3-k8sc3cass0
            c3__namespace-0: 0qaazv8dow0
            c3__role-0: "00"
            c3__seq-0: "00"
            c3__service-0: 0qaazv8dow-c3-c3-k8scass-cs-0010
            c3__subseq-0: "00"
            c3__updated-0: 02023-12-13T00_3A42_3A42.127Z0
            c3__updated_by-0: 0worker0
            c3__updated_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
        services:
          additionalSeedService: {}
          allPodsService: {}
          dcService: {}
          nodePortService: {}
          seedService: {}
      perNodeConfigInitContainerImage: mikefarah/yq:4
      perNodeConfigMapRef: {}
      podSecurityContext:
        fsGroup: 999
        runAsGroup: 999
        runAsUser: 999
      serviceAccount: c3cassandra
      size: 3
      stargate:
        allowStargateOnDataNodes: false
        containerImage:
          name: stargate-v1
          registry: prodqaacr.azurecr.io
          repository: c3.ai
          tag: 1.0.85-r2-202410132043
        heapSize: 256M
        metadata:
          commonLabels:
            azure.workload.identity/use: "true"
            c3__app-0: 0c30
            c3__app_id-0: 0qaazv8dow-c3-c30
            c3__cluster-0: 0qaazv8dow0
            c3__created-0: 02023-12-13T00_3A42_3A42.127Z0
            c3__created_by-0: 0worker0
            c3__created_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
            c3__env-0: 0c30
            c3__env_id-0: 0qaazv8dow-c30
            c3__func-0: 0k8sc3cass0
            c3__id-0: 0qaazv8dow-c3-c3-k8sc3cass0
            c3__namespace-0: 0qaazv8dow0
            c3__role-0: "00"
            c3__seq-0: "00"
            c3__service-0: 0qaazv8dow-c3-c3-k8scass-cs-0010
            c3__subseq-0: "00"
            c3__updated-0: 02023-12-13T00_3A42_3A42.127Z0
            c3__updated_by-0: 0worker0
            c3__updated_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
          pods: {}
          service: {}
        secretsProvider: internal
        serviceAccount: c3cassandra
        size: 1
        tolerations:
        - effect: NoSchedule
          key: cassandra
          operator: Equal
          value: "true"
      stopped: false
      storageConfig:
        cassandraDataVolumeClaimSpec:
          accessModes:
          - ReadWriteOnce
          resources:
            requests:
              storage: 1Ti
          storageClassName: default
      tolerations:
      - effect: NoSchedule
        key: cassandra
        operator: Equal
        value: "true"
    jmxInitContainerImage:
      name: busybox
      registry: docker.io
      tag: 1.34.1
    metadata:
      pods: {}
      services:
        additionalSeedService: {}
        allPodsService: {}
        dcService: {}
        nodePortService: {}
        seedService: {}
    perNodeConfigInitContainerImage: mikefarah/yq:4
    resources:
      limits:
        cpu: "8"
        memory: 64Gi
      requests:
        cpu: "8"
        memory: 64Gi
    serverType: cassandra
    serverVersion: 4.0.13
    superuserSecretRef: {}
    telemetry:
      mcac:
        enabled: true
        metricFilters:
        - deny:org.apache.cassandra.metrics.Table
        - deny:org.apache.cassandra.metrics.table
        - allow:org.apache.cassandra.metrics.table.live_ss_table_count
        - allow:org.apache.cassandra.metrics.Table.LiveSSTableCount
        - allow:org.apache.cassandra.metrics.table.live_disk_space_used
        - allow:org.apache.cassandra.metrics.table.LiveDiskSpaceUsed
        - allow:org.apache.cassandra.metrics.Table.Pending
        - allow:org.apache.cassandra.metrics.Table.Memtable
        - allow:org.apache.cassandra.metrics.Table.Compaction
        - allow:org.apache.cassandra.metrics.table.read
        - allow:org.apache.cassandra.metrics.table.write
        - allow:org.apache.cassandra.metrics.table.range
        - allow:org.apache.cassandra.metrics.table.coordinator
        - allow:org.apache.cassandra.metrics.table.dropped_mutations
        - allow:org.apache.cassandra.metrics.Table.TombstoneScannedHistogram
        - allow:org.apache.cassandra.metrics.table.tombstone_scanned_histogram
      prometheus:
        enabled: true
  medusa:
    cassandraUserSecretRef: {}
    certificatesSecretRef: {}
    containerImage:
      name: c3-cassandra-medusa-fips
      pullPolicy: Always
      registry: prodqaacr.azurecr.io
      repository: c3.ai
      tag: 0.21.0-r5-202407181745
    medusaConfigurationRef: {}
    storageProperties:
      bucketName: qaazv8dow
      concurrentTransfers: 0
      maxBackupAge: 7
      maxBackupCount: 0
      multiPartUploadThreshold: 104857600
      prefix: c3cassandra-backup
      storageProvider: azure_blobs
      storageSecretRef:
        name: cs-1855ea8cc2-medusa-bucket-key
      transferMaxBandwidth: 50MB/s
  reaper:
    ServiceAccountName: c3cassandra
    autoScheduling:
      enabled: true
      initialDelayPeriod: PT15S
      percentUnrepairedThreshold: 10
      periodBetweenPolls: PT10M
      repairType: AUTO
      scheduleSpreadPeriod: PT6H
      timeBeforeFirstSchedule: PT5M
    cassandraUserSecretRef:
      name: cs-1855ea8cc2-superuser
    containerImage:
      name: cassandra-reaper-jre-bcfips
      registry: prodqaacr.azurecr.io
      repository: c3.ai
      tag: 3.5.0-202403142052
    deploymentMode: PER_DC
    heapSize: 2Gi
    httpManagement:
      enabled: false
    initContainerImage:
      name: cassandra-reaper-jre-bcfips
      registry: prodqaacr.azurecr.io
      repository: c3.ai
      tag: 3.5.0-202403142052
    jmxUserSecretRef: {}
    keyspace: reaper_db
    metadata:
      pods:
        labels:
          azure.workload.identity/use: "true"
          c3__app-0: 0c30
          c3__app_id-0: 0qaazv8dow-c3-c30
          c3__cluster-0: 0qaazv8dow0
          c3__created-0: 02023-12-13T00_3A42_3A42.127Z0
          c3__created_by-0: 0worker0
          c3__created_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
          c3__env-0: 0c30
          c3__env_id-0: 0qaazv8dow-c30
          c3__func-0: 0k8sc3cass0
          c3__id-0: 0qaazv8dow-c3-c3-k8sc3cass0
          c3__namespace-0: 0qaazv8dow0
          c3__role-0: "00"
          c3__seq-0: "00"
          c3__service-0: 0qaazv8dow-c3-c3-k8scass-cs-0010
          c3__subseq-0: "00"
          c3__updated-0: 02023-12-13T00_3A42_3A42.127Z0
          c3__updated_by-0: 0worker0
          c3__updated_from-0: 0qaazv8dow-c3-c3-k8spo-appleader-001-6648dbd5cbsq4hl0
      service: {}
    secretsProvider: internal
    tolerations:
    - effect: NoSchedule
      key: cassandra
      operator: Equal
      value: "true"
  secretsProvider: internal
status:
  conditions:
  - lastTransitionTime: "2023-08-15T18:58:42Z"
    status: "True"
    type: CassandraInitialized
  datacenters:
    cs-1855ea8cc2:
      cassandra:
        cassandraOperatorProgress: Ready
        conditions:
        - lastTransitionTime: "2023-12-13T07:23:09Z"
          message: ""
          reason: ""
          status: "True"
          type: Healthy
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "False"
          type: Stopped
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "False"
          type: ReplacingNodes
        - lastTransitionTime: "2024-11-22T07:12:08Z"
          message: ""
          reason: ""
          status: "False"
          type: Updating
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "False"
          type: RollingRestart
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "False"
          type: Resuming
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "False"
          type: ScalingDown
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "True"
          type: Valid
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "True"
          type: Initialized
        - lastTransitionTime: "2023-08-15T18:58:40Z"
          message: ""
          reason: ""
          status: "True"
          type: Ready
        - lastTransitionTime: "2024-11-22T00:02:31Z"
          message: ""
          reason: ""
          status: "False"
          type: RequiresUpdate
        datacenterName: ""
        lastServerNodeStarted: "2024-11-22T07:11:38Z"
        nodeStatuses:
          cs-1855ea8cc2-cs-1855ea8cc2-default-sts-0:
            hostID: 975804b2-abad-425f-a780-ba8f66bec4be
          cs-1855ea8cc2-cs-1855ea8cc2-default-sts-1:
            hostID: 41c647a0-7057-460c-bf84-6d187175aefe
          cs-1855ea8cc2-cs-1855ea8cc2-default-sts-2:
            hostID: 475846a4-c5da-49e7-9dd5-35838abb81db
        observedGeneration: 64
        quietPeriod: "2024-11-22T07:12:14Z"
        superUserUpserted: "2024-11-22T07:12:09Z"
        usersUpserted: "2024-11-22T07:12:09Z"
      reaper:
        conditions:
        - lastTransitionTime: "2024-11-22T07:01:08Z"
          status: "True"
          type: Ready
        progress: Running
      stargate:
        availableReplicas: 1
        conditions:
        - lastTransitionTime: "2024-11-22T07:13:21Z"
          status: "True"
          type: Ready
        deploymentRefs:
        - cs-1855ea8cc2-cs-1855ea8cc2-default-stargate-deployment
        progress: Running
        readyReplicas: 1
        readyReplicasRatio: 1/1
        replicas: 1
        serviceRef: cs-1855ea8cc2-cs-1855ea8cc2-stargate-service
        updatedReplicas: 1
  error: None

MedusaBackupSchedule:

apiVersion: medusa.k8ssandra.io/v1alpha1
kind: MedusaBackupSchedule
metadata:
  creationTimestamp: "2023-12-13T05:13:26Z"
  generation: 1
  labels:
    app: c3aiops
    ops.c3.ai/parent-resource: qaazv8dow-c3cassandra-cs-1855ea8cc2
    role: c3aiops-C3Cassandra
  name: cs-1855ea8cc2-cs-1855ea8cc2
  namespace: qaazv8dow
  resourceVersion: "348632318"
  uid: 3c1a38e6-39dd-41ee-a0de-431f1cbfd2a4
spec:
  backupSpec:
    backupType: differential
    cassandraDatacenter: cs-1855ea8cc2
  cronSchedule: '@daily'
status:
  lastExecution: "2024-11-22T00:00:00Z"
  nextSchedule: "2024-11-23T00:00:00Z"
  • K8ssandra Operator Logs:
Error:
15m         Warning   FailedCreate           statefulset/cs-1855ea8cc2-cs-1855ea8cc2-default-sts                               create Pod cs-1855ea8cc2-cs-1855ea8cc2-default-sts-0 in StatefulSet cs-1855ea8cc2-cs-1855ea8cc2-default-sts failed error: Internal error occurred: failed calling webhook "mpod.kb.io": failed to call webhook: Post "https://c3aiops-k8ssandra-operator-webhook-service.c3-opsadmin.svc:443/mutate-v1-pod-secrets-inject?timeout=10s": no endpoints available for service "c3aiops-k8ssandra-operator-webhook-service"

2024-11-22T04:25:56.431Z        INFO    Observed a panic in reconciler: runtime error: invalid memory address or nil pointer dereference        {"controller": "medusabackupjob", "controllerGroup": "medusa.k8ssandra.io", "controllerKind": "MedusaBackupJob", "MedusaBackupJob": {"name":"cs-1855ea8cc2-cs-1855ea8cc2-1717977600","namespace":"qaazv8dow"}, "namespace": "qaazv8dow", "name": "cs-1855ea8cc2-cs-1855ea8cc2-1717977600", "reconcileID": "cec567f9-0bc6-4c46-9c55-5ee233259314"}
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x55f16f305904]

goroutine 597 [running]:
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile.func1()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:119 +0x1e5
panic({0x55f16f77d520?, 0x55f170644c80?})
        runtime/panic.go:770 +0x132
github.com/k8ssandra/k8ssandra-operator/controllers/medusa.(*MedusaBackupJobReconciler).createMedusaBackup(0xc000846480, {0x55f16f9d1440, 0xc0007c78f0}, 0xc00089b040, 0x0, {{0x55f16f9d58e8?, 0xc0007c7950?}, 0x55f170746ce0?})
        github.com/k8ssandra/k8ssandra-operator/controllers/medusa/medusabackupjob_controller.go:275 +0x5a4
github.com/k8ssandra/k8ssandra-operator/controllers/medusa.(*MedusaBackupJobReconciler).Reconcile(0xc000846480, {0x55f16f9d1440, 0xc0007c78f0}, {{{0xc000ca6356, 0x9}, {0xc000cc2420, 0x26}}})
        github.com/k8ssandra/k8ssandra-operator/controllers/medusa/medusabackupjob_controller.go:171 +0x569
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile(0x55f16f9d1440?, {0x55f16f9d1440?, 0xc0007c78f0?}, {{{0xc000ca6356?, 0x55f16f6bee00?}, {0xc000cc2420?, 0x10?}}})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:122 +0xb7
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc000188a00, {0x55f16f9d1478, 0xc0001f3400}, {0x55f16f7dea00, 0xc000b161c0})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:323 +0x345
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc000188a00, {0x55f16f9d1478, 0xc0001f3400})
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:274 +0x1c9
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2()
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:235 +0x79
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2 in goroutine 140
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:231 +0x50c

Logs once k8ssandra-operator reached a Running state after the above crash:

2024-11-22T06:32:06.089Z        ERROR   Failed to fetch datacenter pods {"controller": "k8ssandracluster", "controllerGroup": "k8ssandra.io", "controllerKind": "K8ssandraCluster", "K8ssandraCluster": {"name":"cs-1855ea8cc2","namespace":"qaazv8dow"}, "namespace": "qaazv8dow", "name": "cs-1855ea8cc2", "reconcileID": "f52dcd0e-f2fa-4de2-9cd8-a5cf249a4dd8", "K8ssandraCluster": "qaazv8dow/cs-1855ea8cc2", "CassandraDatacenter": "qaazv8dow/cs-1855ea8cc2", "K8SContext": "", "error": "no pods in READY state found in datacenter cs-1855ea8cc2"}
github.com/k8ssandra/k8ssandra-operator/pkg/cassandra.(*defaultManagementApiFacade).ListKeyspaces
        github.com/k8ssandra/k8ssandra-operator/pkg/cassandra/management.go:192
github.com/k8ssandra/k8ssandra-operator/pkg/cassandra.(*defaultManagementApiFacade).EnsureKeyspaceReplication
        github.com/k8ssandra/k8ssandra-operator/pkg/cassandra/management.go:291
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).updateReplicationOfSystemKeyspaces
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/schemas.go:161
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).checkSchemas
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/schemas.go:43
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).reconcileDatacenters
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/datacenters.go:207
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).reconcile
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/k8ssandracluster_controller.go:144
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).Reconcile
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/k8ssandracluster_controller.go:92
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:122
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:323
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:235
2024-11-22T06:32:06.090Z        ERROR   Failed to update replication    {"controller": "k8ssandracluster", "controllerGroup": "k8ssandra.io", "controllerKind": "K8ssandraCluster", "K8ssandraCluster": {"name":"cs-1855ea8cc2","namespace":"qaazv8dow"}, "namespace": "qaazv8dow", "name": "cs-1855ea8cc2", "reconcileID": "f52dcd0e-f2fa-4de2-9cd8-a5cf249a4dd8", "K8ssandraCluster": "qaazv8dow/cs-1855ea8cc2", "CassandraDatacenter": "qaazv8dow/cs-1855ea8cc2", "K8SContext": "", "keyspace": "system_traces", "error": "no pods in READY state found in datacenter cs-1855ea8cc2"}
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).updateReplicationOfSystemKeyspaces
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/schemas.go:165
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).checkSchemas
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/schemas.go:43
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).reconcileDatacenters
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/datacenters.go:207
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).reconcile
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/k8ssandracluster_controller.go:144
github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra.(*K8ssandraClusterReconciler).Reconcile
        github.com/k8ssandra/k8ssandra-operator/controllers/k8ssandra/k8ssandracluster_controller.go:92
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:122
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:323
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:235
2024-11-22T06:32:06.090Z        DEBUG   events  no pods in READY state found in datacenter cs-1855ea8cc2        {"type": "Warning", "object": {"kind":"K8ssandraCluster","namespace":"qaazv8dow","name":"cs-1855ea8cc2","uid":"6ffc08c2-d358-4f3b-a102-e99dbd396651","apiVersion":"k8ssandra.io/v1alpha1","resourceVersion":"348839464"}, "reason": "Reconcile Error"}
2024-11-22T06:32:06.106Z        INFO    updated k8ssandracluster status {"controller": "k8ssandracluster", "controllerGroup": "k8ssandra.io", "controllerKind": "K8ssandraCluster", "K8ssandraCluster": {"name":"cs-1855ea8cc2","namespace":"qaazv8dow"}, "namespace": "qaazv8dow", "name": "cs-1855ea8cc2", "reconcileID": "f52dcd0e-f2fa-4de2-9cd8-a5cf249a4dd8", "K8ssandraCluster": "qaazv8dow/cs-1855ea8cc2"}
2024-11-22T06:32:06.106Z        ERROR   Reconciler error        {"controller": "k8ssandracluster", "controllerGroup": "k8ssandra.io", "controllerKind": "K8ssandraCluster", "K8ssandraCluster": {"name":"cs-1855ea8cc2","namespace":"qaazv8dow"}, "namespace": "qaazv8dow", "name": "cs-1855ea8cc2", "reconcileID": "f52dcd0e-f2fa-4de2-9cd8-a5cf249a4dd8", "error": "no pods in READY state found in datacenter cs-1855ea8cc2"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:329
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:235

Anything else we need to know?:
I checked the code and I believe all k8ssandra-operator versions are impacted, not only 1.14

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: K8OP-294
@c3-clement c3-clement added the bug Something isn't working label Nov 22, 2024
@burmanm
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burmanm commented Nov 22, 2024

@rzvoncek This happens because we can exit here: https://github.com/k8ssandra/k8ssandra-operator/blob/main/controllers/medusa/medusabackupjob_controller.go#L251

We didn't find any pod with the backupSummary, but we also didn't encounter any errors. So the createMedusaBackup is called with a nil pointer for backupSummary.

@c3-clement
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I updated the issue with K8ssandraCluster and MedusaBackupSchedule manifests

@c3-clement
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For more context, cluster admin entirely deleted the 1.29 Nodepool containing Cassandra pods, and then re-created a 1.30 nodepool.

That explains why StatefulSet had 0 pod running, causing the crash in medusabackupjob_controller

@rzvoncek rzvoncek linked a pull request Nov 28, 2024 that will close this issue
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K8OP-294 Do not try to work out backup status if there are no pods k8ssandra/k8ssandra-operator
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@burmanm @c3-clement