Chin-Ya Huang 5f4111249a feat(lep): consolidate instance managers

Ref: 5208

Signed-off-by: Chin-Ya Huang <chin-ya.huang@suse.com>

2023-05-03 09:57:48 +08:00

24 KiB

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Consolidate Longhorn Instance Managers

Summary

Longhorn architecture includes engine and replica instance manager pods on each node. After the upgrade, Longhorn adds an additional engine and replica instance manager pods. When the cluster is set with a default request of 12% guaranteed CPU, all instance manager pods will occupy 12% * 4 CPUs per node. Nevertheless, this caused high base resource requirements and is likely unnecessary.

NAME                STATE      E-CPU(CORES)   E-MEM(BYTES)   R-CPU(CORES)   R-MEM(BYTES)   CREATED-WORKLOADS   DURATION(MINUTES)   AGE
demo-0 (no-IO)      Complete   8.88m          24Mi           1.55m          43Mi           5                   10                  22h
demo-0-bs-512b-5g   Complete   109.70m        66Mi           36.46m         54Mi           5                   10                  16h
demo-0-bs-1m-10g    Complete   113.16m        65Mi           36.63m         56Mi           5                   10                  14h
demo-0-bs-5m-10g    Complete   114.17m        64Mi           31.37m         54Mi           5                   10                  42m

Aiming to simplify the architecture and free up some resource requests, this document proposes to consolidate the engine and replica instance managers into a single pod. This consolidation will not affect any data plane operations or volume migration. As the engine process is the primary consumer of CPU resources, merging the instance managers will result in a 50% reduction in CPU requests for instance managers. This is because there will only be one instance manager pod for both process types.

Phase 1:

https://github.com/longhorn/longhorn/issues/5208

Phase 2:

Motivation

Goals

Having single instance manager pods to run replica and engine processes.
After the Longhorn upgrade, the previous engine instance manager should continue to handle data plane operations for attached volumes until they are detached. And the replica instance managers should continue servicing data plane operations until the volume engine is upgraded or volume is detached.
Automatically clean up any engine/replica instance managers when all instances (process) get removed.
Online/offline upgrade volume engine should be functional. The replicas will automatically migrate to use the new aio (all-in-one) type instance managers, and the engine type instance manager will continue to serve until the first volume detachment.
The Pod Disruption Budget (PDB) handling for cluster auto-scaler and node drain should work as expected.

Non-goals [optional]

None

Proposal

To ensure uninterrupted upgrades, this enhancement will be implemented in two phases. The existing engine/replica instance manager may coexist with the consolidated instance manager during the transition.

Phase 1:

Introduce a new aio instance manager type. The engine and replica instance manager types will be deprecated and continue to serve for the upgraded volumes until the first volume detachment.
Introduce new Guaranteed Instance Manager CPU setting, Guaranteed Engine Manager CPU and Guaranteed Replica Manager CPU settings will be deprecated and continues to serve for the upgraded volumes until the first volume detachment.

Phase 2:

Remove all instance manager types.
Remove the Guaranteed Engine Manager CPU and Guaranteed Replica Manager CPU settings.

User Stories

For freshly installed Longhorn, the user will see aio type instance managers.
For upgraded Longhorn with all volume detached, the user will see the engine, and replica instance managers removed and replaced by aio type instance managers.
For upgraded Longhorn with volume attached, the user will see existing engine, and replica instance managers still servicing the old attached volumes and the new aio type instance manager servicing new volume attachments.

User Experience In Detail

New Installation

User creates and attaches a volume.

> kubectl -n longhorn-system get volume
NAME     STATE      ROBUSTNESS   SCHEDULED   SIZE          NODE            AGE
demo-0   attached   unknown                  21474836480   ip-10-0-1-113   12s

> kubectl -n longhorn-system get lhim
NAME                                                STATE     TYPE   NODE            AGE
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4   running   aio    ip-10-0-1-105   124m
instance-manager-7e59c9f2ef7649630344050a8d5be68e   running   aio    ip-10-0-1-102   124m
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc   running   aio    ip-10-0-1-113   124m

> kubectl -n longhorn-system get lhim/instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc -o yaml
apiVersion: longhorn.io/v1beta2
kind: InstanceManager
metadata:
  creationTimestamp: "2023-03-16T10:48:59Z"
  generation: 1
  labels:
    longhorn.io/component: instance-manager
    longhorn.io/instance-manager-image: imi-8d41c3a4
    longhorn.io/instance-manager-type: aio
    longhorn.io/managed-by: longhorn-manager
    longhorn.io/node: ip-10-0-1-113
  name: instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc
  namespace: longhorn-system
  ownerReferences:
  - apiVersion: longhorn.io/v1beta2
    blockOwnerDeletion: true
    kind: Node
    name: ip-10-0-1-113
    uid: 00c0734b-f061-4b28-8071-62596274cb18
  resourceVersion: "926067"
  uid: a869def6-1077-4363-8b64-6863097c1e26
spec:
  engineImage: ""
  image: c3y1huang/research:175-lh-im
  nodeID: ip-10-0-1-113
  type: aio
status:
  apiMinVersion: 1
  apiVersion: 3
  currentState: running
  instanceEngines:
    demo-0-e-06d4c77d:
      spec:
        name: demo-0-e-06d4c77d
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10015
        portStart: 10015
        resourceVersion: 0
        state: running
        type: engine
  instanceReplicas:
    demo-0-r-ca78cab4:
      spec:
        name: demo-0-r-ca78cab4
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10014
        portStart: 10000
        resourceVersion: 0
        state: running
        type: replica
  ip: 10.42.0.238
  ownerID: ip-10-0-1-113
  proxyApiMinVersion: 1
  proxyApiVersion: 4

The engine and replica instances(processes) created in the aio type instance manager.

Upgrade With Volumes Detached

User has a Longhorn v1.4.0 cluster and a volume in the detached state.

> kubectl -n longhorn-system get volume
NAME     STATE      ROBUSTNESS   SCHEDULED   SIZE          NODE   AGE
demo-1   detached   unknown                  21474836480          12s

> kubectl -n longhorn-system get lhim
NAME                                                  STATE     TYPE      NODE            AGE
instance-manager-r-1278a39fa6e6d8f49eba156b81ac1f59   running   replica   ip-10-0-1-113   3m44s
instance-manager-e-1278a39fa6e6d8f49eba156b81ac1f59   running   engine    ip-10-0-1-113   3m44s
instance-manager-e-45ad195db7f55ed0a2dd1ea5f19c5edf   running   engine    ip-10-0-1-105   3m41s
instance-manager-r-45ad195db7f55ed0a2dd1ea5f19c5edf   running   replica   ip-10-0-1-105   3m41s
instance-manager-e-225a2c7411a666c8eab99484ab632359   running   engine    ip-10-0-1-102   3m42s
instance-manager-r-225a2c7411a666c8eab99484ab632359   running   replica   ip-10-0-1-102   3m42s

User upgraded Longhorn to v1.5.0.

> kubectl -n longhorn-system get lhim
NAME                                                STATE     TYPE   NODE            AGE
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4   running   aio    ip-10-0-1-105   112s
instance-manager-7e59c9f2ef7649630344050a8d5be68e   running   aio    ip-10-0-1-102   48s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc   running   aio    ip-10-0-1-113   47s

Unused engine type instance managers removed.
Unused replica type instance managers removed.
3 aio type instance managers created.

User upgraded volume engine.

User attaches the volume.

> kubectl -n longhorn-system get volume
NAME     STATE      ROBUSTNESS   SCHEDULED   SIZE          NODE            AGE
demo-1   attached   healthy                  21474836480   ip-10-0-1-113   4m51s

> kubectl -n longhorn-system get lhim
NAME                                                STATE     TYPE   NODE            AGE
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4   running   aio    ip-10-0-1-105   3m58s
instance-manager-7e59c9f2ef7649630344050a8d5be68e   running   aio    ip-10-0-1-102   2m54s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc   running   aio    ip-10-0-1-113   2m53s

> kubectl -n longhorn-system get lhim/instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc -o yaml
apiVersion: longhorn.io/v1beta2
kind: InstanceManager
metadata:
  creationTimestamp: "2023-03-16T13:03:15Z"
  generation: 1
  labels:
    longhorn.io/component: instance-manager
    longhorn.io/instance-manager-image: imi-8d41c3a4
    longhorn.io/instance-manager-type: aio
    longhorn.io/managed-by: longhorn-manager
    longhorn.io/node: ip-10-0-1-113
  name: instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc
  namespace: longhorn-system
  ownerReferences:
  - apiVersion: longhorn.io/v1beta2
    blockOwnerDeletion: true
    kind: Node
    name: ip-10-0-1-113
    uid: 12eb73cd-e9de-4c45-875d-3eff7cfb1034
  resourceVersion: "3762"
  uid: c996a89a-f841-4841-b69d-4218ed8d8c6e
spec:
  engineImage: ""
  image: c3y1huang/research:175-lh-im
  nodeID: ip-10-0-1-113
  type: aio
status:
  apiMinVersion: 1
  apiVersion: 3
  currentState: running
  instanceEngines:
    demo-1-e-b7d28fb3:
      spec:
        name: demo-1-e-b7d28fb3
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10015
        portStart: 10015
        resourceVersion: 0
        state: running
        type: engine
  instanceReplicas:
    demo-1-r-189c1bbb:
      spec:
        name: demo-1-r-189c1bbb
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10014
        portStart: 10000
        resourceVersion: 0
        state: running
        type: replica
  ip: 10.42.0.28
  ownerID: ip-10-0-1-113
  proxyApiMinVersion: 1
  proxyApiVersion: 4

The engine and replica instances(processes) created in the aio type instance manager.

Upgrade With Volumes Attached

User has a Longhorn v1.4.0 cluster and a volume in the attached state.

> kubectl -n longhorn-system get volume
NAME     STATE      ROBUSTNESS   SCHEDULED   SIZE          NODE            AGE
demo-2   attached   healthy                  21474836480   ip-10-0-1-113   35s

> kubectl -n longhorn-system get lhim
NAME                                                  STATE     TYPE      NODE            AGE
instance-manager-r-1278a39fa6e6d8f49eba156b81ac1f59   running   replica   ip-10-0-1-113   2m41s
instance-manager-r-45ad195db7f55ed0a2dd1ea5f19c5edf   running   replica   ip-10-0-1-105   119s
instance-manager-r-225a2c7411a666c8eab99484ab632359   running   replica   ip-10-0-1-102   119s
instance-manager-e-1278a39fa6e6d8f49eba156b81ac1f59   running   engine    ip-10-0-1-113   2m41s
instance-manager-e-225a2c7411a666c8eab99484ab632359   running   engine    ip-10-0-1-102   119s
instance-manager-e-45ad195db7f55ed0a2dd1ea5f19c5edf   running   engine    ip-10-0-1-105   119s

User upgraded Longhorn to v1.5.0.

> kubectl -n longhorn-system get lhim
NAME                                                  STATE     TYPE      NODE            AGE
instance-manager-r-1278a39fa6e6d8f49eba156b81ac1f59   running   replica   ip-10-0-1-113   5m24s
instance-manager-r-45ad195db7f55ed0a2dd1ea5f19c5edf   running   replica   ip-10-0-1-105   4m42s
instance-manager-r-225a2c7411a666c8eab99484ab632359   running   replica   ip-10-0-1-102   4m42s
instance-manager-e-1278a39fa6e6d8f49eba156b81ac1f59   running   engine    ip-10-0-1-113   5m24s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc     running   aio       ip-10-0-1-113   117s
instance-manager-7e59c9f2ef7649630344050a8d5be68e     running   aio       ip-10-0-1-102   33s
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4     running   aio       ip-10-0-1-105   32s

2 unused engine type instance managers removed.
3 aio type instance managers created.

User upgraded online volume engine.

> kubectl -n longhorn-system get lhim
NAME                                                  STATE     TYPE     NODE            AGE
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4     running   aio      ip-10-0-1-105   6m53s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc     running   aio      ip-10-0-1-113   8m18s
instance-manager-7e59c9f2ef7649630344050a8d5be68e     running   aio      ip-10-0-1-102   6m54s
instance-manager-e-1278a39fa6e6d8f49eba156b81ac1f59   running   engine   ip-10-0-1-113   11m

All replica type instance manager migrated to aio type instance managers.

User detached the volume.

> kubectl -n longhorn-system get lhim
NAME                                                STATE     TYPE   NODE            AGE
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4   running   aio    ip-10-0-1-105   8m38s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc   running   aio    ip-10-0-1-113   10m
instance-manager-7e59c9f2ef7649630344050a8d5be68e   running   aio    ip-10-0-1-102   8m39s

The engine type instance managers removed.

User attached the volume.

> kubectl -n longhorn-system get volume
NAME     STATE      ROBUSTNESS   SCHEDULED   SIZE          NODE            AGE
demo-2   attached   healthy                  21474836480   ip-10-0-1-113   12m

> kubectl -n longhorn-system get lhim
NAME                                                STATE     TYPE   NODE            AGE
instance-manager-7e59c9f2ef7649630344050a8d5be68e   running   aio    ip-10-0-1-102   9m40s
instance-manager-8f81ca7c3bf95bbbf656be6ac2d1b7c4   running   aio    ip-10-0-1-105   9m39s
instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc   running   aio    ip-10-0-1-113   11m

> kubectl -n longhorn-system get lhim/instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc -o yaml
apiVersion: longhorn.io/v1beta2
kind: InstanceManager
metadata:
  creationTimestamp: "2023-03-16T13:12:41Z"
  generation: 1
  labels:
    longhorn.io/component: instance-manager
    longhorn.io/instance-manager-image: imi-8d41c3a4
    longhorn.io/instance-manager-type: aio
    longhorn.io/managed-by: longhorn-manager
    longhorn.io/node: ip-10-0-1-113
  name: instance-manager-b34d5db1fe1e2d52bcfb308be3166cfc
  namespace: longhorn-system
  ownerReferences:
  - apiVersion: longhorn.io/v1beta2
    blockOwnerDeletion: true
    kind: Node
    name: ip-10-0-1-113
    uid: 6d109c40-abe3-42ed-8e40-f76cfc33e4c2
  resourceVersion: "4339"
  uid: 01556f2c-fbb4-4a15-a778-c73df518b070
spec:
  engineImage: ""
  image: c3y1huang/research:175-lh-im
  nodeID: ip-10-0-1-113
  type: aio
status:
  apiMinVersion: 1
  apiVersion: 3
  currentState: running
  instanceEngines:
    demo-2-e-65845267:
      spec:
        name: demo-2-e-65845267
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10015
        portStart: 10015
        resourceVersion: 0
        state: running
        type: engine
  instanceReplicas:
    demo-2-r-a2bd415f:
      spec:
        name: demo-2-r-a2bd415f
      status:
        endpoint: ""
        errorMsg: ""
        listen: ""
        portEnd: 10014
        portStart: 10000
        resourceVersion: 0
        state: running
        type: replica
  ip: 10.42.0.31
  ownerID: ip-10-0-1-113
  proxyApiMinVersion: 1
  proxyApiVersion: 4

The engine and replica instances(processes) created in the aio type instance manager.

API changes

Introduce new instanceManagerCPURequest in Node resource.
Introduce new instanceEngines in InstanceManager resource.
Introduce new instanceReplicas in InstanceManager resource.

Design

Phase 1: All-in-one Instance Manager Implementation Overview

Introducing a new instance manager type to have Longhorn continue to service existing attached volumes for Longhorn v1.5.x.

New Instance Manager Type

Introduce a new aio (all-in-one) instance manager type to differentiate the handling of the old engine/replica instance managers and the new consolidated instance managers.
When getting InstanceManagers by instance of the attached volume, retrieve the InstanceManager from the instance manager list using the new aio type.

InstanceManager `instances` Field Replacement For New InstanceManagers

New InstanceManagers will use the instanceEngines and instanceReplicas fields, replacing the instances field.
For the existing InstanceManagers for the attached Volumes, the instances field will remain in use.

Instance Manager Execution

Rename the engine-manager script to instance-manager.
Bump up version to 4.

New Instance Manager Pod

Replace engine and replica pod creation with spec to use for aio instance manager pod.

> kubectl -n longhorn-system get pod/instance-manager-0d96990c6881c828251c534eb31bfa85 -o yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    longhorn.io/last-applied-tolerations: '[]'
  creationTimestamp: "2023-03-01T08:13:03Z"
  labels:
    longhorn.io/component: instance-manager
    longhorn.io/instance-manager-image: imi-a1873aa3
    longhorn.io/instance-manager-type: aio
    longhorn.io/managed-by: longhorn-manager
    longhorn.io/node: ip-10-0-1-113
  name: instance-manager-0d96990c6881c828251c534eb31bfa85
  namespace: longhorn-system
  ownerReferences:
  - apiVersion: longhorn.io/v1beta2
    blockOwnerDeletion: true
    controller: true
    kind: InstanceManager
    name: instance-manager-0d96990c6881c828251c534eb31bfa85
    uid: 51c13e4f-d0a2-445d-b98b-80cca7080c78
  resourceVersion: "12133"
  uid: 81397cca-d9e9-48f6-8813-e7f2e2cd4617
spec:
  containers:
  - args:
    - instance-manager
    - --debug
    - daemon
    - --listen
    - 0.0.0.0:8500
    env:
    - name: TLS_DIR
      value: /tls-files/
    image: c3y1huang/research:174-lh-im
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 3
      initialDelaySeconds: 3
      periodSeconds: 5
      successThreshold: 1
      tcpSocket:
        port: 8500
      timeoutSeconds: 4
    name: instance-manager
    resources:
      requests:
        cpu: 960m
    securityContext:
      privileged: true
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /host
      mountPropagation: HostToContainer
      name: host
    - mountPath: /engine-binaries/
      mountPropagation: HostToContainer
      name: engine-binaries
    - mountPath: /host/var/lib/longhorn/unix-domain-socket/
      name: unix-domain-socket
    - mountPath: /tls-files/
      name: longhorn-grpc-tls
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-hkbfc
      readOnly: true
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: ip-10-0-1-113
  preemptionPolicy: PreemptLowerPriority
  priority: 0
  restartPolicy: Never
  schedulerName: default-scheduler
  securityContext: {}
  serviceAccount: longhorn-service-account
  serviceAccountName: longhorn-service-account
  terminationGracePeriodSeconds: 30
  tolerations:
  - effect: NoExecute
    key: node.kubernetes.io/not-ready
    operator: Exists
    tolerationSeconds: 300
  - effect: NoExecute
    key: node.kubernetes.io/unreachable
    operator: Exists
    tolerationSeconds: 300
  volumes:
  - hostPath:
      path: /
      type: ""
    name: host
  - hostPath:
      path: /var/lib/longhorn/engine-binaries/
      type: ""
    name: engine-binaries
  - hostPath:
      path: /var/lib/longhorn/unix-domain-socket/
      type: ""
    name: unix-domain-socket
  - name: longhorn-grpc-tls
    secret:
      defaultMode: 420
      optional: true
      secretName: longhorn-grpc-tls
  - name: kube-api-access-hkbfc
    projected:
      defaultMode: 420
      sources:
      - serviceAccountToken:
          expirationSeconds: 3607
          path: token
      - configMap:
          items:
          - key: ca.crt
            path: ca.crt
          name: kube-root-ca.crt
      - downwardAPI:
          items:
          - fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
            path: namespace
status:
  conditions:
  - lastProbeTime: null
    lastTransitionTime: "2023-03-01T08:13:03Z"
    status: "True"
    type: Initialized
  - lastProbeTime: null
    lastTransitionTime: "2023-03-01T08:13:04Z"
    status: "True"
    type: Ready
  - lastProbeTime: null
    lastTransitionTime: "2023-03-01T08:13:04Z"
    status: "True"
    type: ContainersReady
  - lastProbeTime: null
    lastTransitionTime: "2023-03-01T08:13:03Z"
    status: "True"
    type: PodScheduled
  containerStatuses:
  - containerID: containerd://cb249b97d128e47a7f13326b76496656d407fd16fc44b5f1a37384689d0fa900
    image: docker.io/c3y1huang/research:174-lh-im
    imageID: docker.io/c3y1huang/research@sha256:1f4e86b92b3f437596f9792cd42a1bb59d1eace4196139dc030b549340af2e68
    lastState: {}
    name: instance-manager
    ready: true
    restartCount: 0
    started: true
    state:
      running:
        startedAt: "2023-03-01T08:13:03Z"
  hostIP: 10.0.1.113
  phase: Running
  podIP: 10.42.0.27
  podIPs:
  - ip: 10.42.0.27
  qosClass: Burstable
  startTime: "2023-03-01T08:13:03Z"

Controllers Change

Map the status of the engine/replica process to the corresponding instanceEngines/instanceReplicas fields in the InstanceManager instead of the instances field. To ensure backward compatibility, the instances field will continue to be utilized by the pre-upgrade attached volume.
Ensure support for the previous version's attached volumes with the old engine/replica instance manager types.
Replace the old engine/replica InstanceManagers with the aio type instance manager during replenishment.

New Setting

Introduce a new Guaranteed Instance Manager CPU setting for the new aio instance manager pod.
The Guaranteed Engine Manager CPU and Guaranteed Replica Manager CPU will co-exist with this setting in Longhorn v1.5.x.

Phase 2 - Deprecations Overview

Based on the assumption when upgrading from v1.5.x to 1.6.x, volumes should have detached at least once and migrated to aio type instance managers. Then the cluster should not have volume depending on engine and replica type instance managers. Therefore in this phase, remove the related types and settings.

Old Instance Manager Types

Remove the engine, replica, and aio instance manager types. There is no need for differentiation.

Old Settings

Remove the Guaranteed Engine Manager CPU and Guaranteed Replica Manager CPU settings. The settings have already been replaced by the Guaranteed Instance Manager CPU setting in phase 1.

Controllers Change

Remove support for engine/replica InstanceManager types.

Test plan

Support new aio instance manager type and run regression test cases.

Upgrade strategy

The instances field in the instance manager custom resource will still be utilized by old instance managers of the attached volume.

Note [optional]

None

24 KiB Raw Blame History

Consolidate Longhorn Instance Managers

Summary

Related Issues

Motivation

Goals

Non-goals [optional]

Proposal

User Stories

User Experience In Detail

New Installation

Upgrade With Volumes Detached

Upgrade With Volumes Attached

API changes

Design

Phase 1: All-in-one Instance Manager Implementation Overview

New Instance Manager Type

InstanceManager instances Field Replacement For New InstanceManagers

Instance Manager Execution

New Instance Manager Pod

Controllers Change

New Setting

Phase 2 - Deprecations Overview

Old Instance Manager Types

Old Settings

Controllers Change

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InstanceManager `instances` Field Replacement For New InstanceManagers