-
Notifications
You must be signed in to change notification settings - Fork 408
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
add yurthub leader election and coordinator framework (#1035)
* improve health checker for adapting coordinator * add yurthub leader election and coordinator framework
- Loading branch information
1 parent
08aa8e3
commit 0db2b87
Showing
5 changed files
with
288 additions
and
11 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| Copyright 2022 The OpenYurt Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package poolcoordinator | ||
|
|
||
| import ( | ||
| "k8s.io/klog/v2" | ||
|
|
||
| "github.com/openyurtio/openyurt/pkg/yurthub/healthchecker" | ||
| ) | ||
|
|
||
| type Coordinator struct { | ||
| coordinatorHealthChecker healthchecker.HealthChecker | ||
| hubElector *HubElector | ||
| informerStarted bool | ||
| } | ||
|
|
||
| func NewCoordinator(coordinatorHealthChecker healthchecker.HealthChecker, elector *HubElector, stopCh <-chan struct{}) *Coordinator { | ||
| return &Coordinator{ | ||
| coordinatorHealthChecker: coordinatorHealthChecker, | ||
| hubElector: elector, | ||
| } | ||
| } | ||
|
|
||
| func (coordinator *Coordinator) Run(stopCh <-chan struct{}) { | ||
| for { | ||
| select { | ||
| case <-stopCh: | ||
| klog.Infof("exit normally in coordinator loop.") | ||
| if coordinator.informerStarted { | ||
| // stop shared informer | ||
| // | ||
| coordinator.informerStarted = false | ||
| } | ||
| return | ||
| case electorStatus, ok := <-coordinator.hubElector.StatusChan(): | ||
| if !ok { | ||
| return | ||
| } | ||
|
|
||
| if electorStatus != PendingHub && !coordinator.cacheIsUploaded() { | ||
| // upload local cache, and make sure yurthub pod is the last resource uploaded | ||
| } | ||
|
|
||
| if electorStatus == LeaderHub { | ||
| if !coordinator.informerStarted { | ||
| coordinator.informerStarted = true | ||
| // start shared informer for pool-scope data | ||
| // make sure | ||
|
|
||
| // start shared informer for lease delegating | ||
| // | ||
| } | ||
| break | ||
| } | ||
|
|
||
| if electorStatus == FollowerHub { | ||
| if coordinator.informerStarted { | ||
| // stop shared informer | ||
| // | ||
| coordinator.informerStarted = false | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (coordinator *Coordinator) cacheIsUploaded() bool { | ||
| // check yurthub pod is uploaded | ||
| return true | ||
| } | ||
|
|
||
| func (coordinator *Coordinator) IsReady() bool { | ||
|
|
||
| return true | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| /* | ||
| Copyright 2022 The OpenYurt Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package poolcoordinator | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/leaderelection" | ||
| "k8s.io/client-go/tools/leaderelection/resourcelock" | ||
| "k8s.io/klog/v2" | ||
|
|
||
| "github.com/openyurtio/openyurt/cmd/yurthub/app/config" | ||
| "github.com/openyurtio/openyurt/pkg/yurthub/healthchecker" | ||
| ) | ||
|
|
||
| const ( | ||
| InitHub int32 = iota // 0 | ||
| LeaderHub | ||
| FollowerHub | ||
| PendingHub | ||
| ) | ||
|
|
||
| type HubElector struct { | ||
| coordinatorClient kubernetes.Interface | ||
| coordinatorHealthChecker healthchecker.HealthChecker | ||
| cloudAPIServerHealthChecker healthchecker.HealthChecker | ||
| electorStatus chan int32 | ||
| le *leaderelection.LeaderElector | ||
| inElecting bool | ||
| } | ||
|
|
||
| func NewHubElector(cfg *config.YurtHubConfiguration, coordinatorClient kubernetes.Interface, cloudAPIServerHealthyChecker healthchecker.HealthChecker, stopCh <-chan struct{}) (*HubElector, error) { | ||
| coordinatorHealthyChecker, err := healthchecker.NewCoordinatorHealthChecker(cfg, coordinatorClient, cloudAPIServerHealthyChecker, stopCh) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| he := &HubElector{ | ||
| coordinatorClient: coordinatorClient, | ||
| coordinatorHealthChecker: coordinatorHealthyChecker, | ||
| cloudAPIServerHealthChecker: cloudAPIServerHealthyChecker, | ||
| electorStatus: make(chan int32), | ||
| } | ||
|
|
||
| rl, err := resourcelock.New(cfg.LeaderElection.ResourceLock, | ||
| cfg.LeaderElection.ResourceNamespace, | ||
| cfg.LeaderElection.ResourceName, | ||
| coordinatorClient.CoreV1(), | ||
| coordinatorClient.CoordinationV1(), | ||
| resourcelock.ResourceLockConfig{Identity: cfg.NodeName}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| le, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{ | ||
| Lock: rl, | ||
| LeaseDuration: cfg.LeaderElection.LeaseDuration.Duration, | ||
| RenewDeadline: cfg.LeaderElection.RenewDeadline.Duration, | ||
| RetryPeriod: cfg.LeaderElection.RetryPeriod.Duration, | ||
| Callbacks: leaderelection.LeaderCallbacks{ | ||
| OnStartedLeading: func(ctx context.Context) { | ||
| klog.Infof("yurthub of %s became lease", cfg.NodeName) | ||
| he.electorStatus <- LeaderHub | ||
| }, | ||
| OnStoppedLeading: func() { | ||
|
|
||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| he.le = le | ||
| he.electorStatus <- PendingHub | ||
|
|
||
| return he, nil | ||
| } | ||
|
|
||
| func (he *HubElector) Run(stopCh <-chan struct{}) { | ||
| intervalTicker := time.NewTicker(5 * time.Second) | ||
| defer intervalTicker.Stop() | ||
| defer close(he.electorStatus) | ||
|
|
||
| var ctx context.Context | ||
| var cancel context.CancelFunc | ||
| for { | ||
| select { | ||
| case <-stopCh: | ||
| klog.Infof("exit normally in leader election loop.") | ||
|
|
||
| if cancel != nil { | ||
| cancel() | ||
| he.inElecting = false | ||
| } | ||
| return | ||
| case <-intervalTicker.C: | ||
| if !he.coordinatorHealthChecker.IsHealthy() { | ||
| if he.inElecting && cancel != nil { | ||
| cancel() | ||
| he.inElecting = false | ||
| he.electorStatus <- PendingHub | ||
| } | ||
| break | ||
| } | ||
|
|
||
| if !he.cloudAPIServerHealthChecker.IsHealthy() { | ||
| if he.inElecting && cancel != nil { | ||
| cancel() | ||
| he.inElecting = false | ||
| he.electorStatus <- FollowerHub | ||
| } | ||
| break | ||
| } | ||
|
|
||
| if !he.inElecting { | ||
| he.electorStatus <- FollowerHub | ||
| ctx, cancel = context.WithCancel(context.TODO()) | ||
| go he.le.Run(ctx) | ||
| he.inElecting = true | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (he *HubElector) StatusChan() chan int32 { | ||
| return he.electorStatus | ||
| } |