// syncStatusOnly only updates Deployments Status and doesn't take any mutating actions. func (dc *DeploymentController) syncStatusOnly(ctx context.Context, d *apps.Deployment, rsList []*apps.ReplicaSet) error { … } // sync is responsible for reconciling deployments on scaling events or when they // are paused. func (dc *DeploymentController) sync(ctx context.Context, d *apps.Deployment, rsList []*apps.ReplicaSet) error { … } // checkPausedConditions checks if the given deployment is paused or not and adds an appropriate condition. // These conditions are needed so that we won't accidentally report lack of progress for resumed deployments // that were paused for longer than progressDeadlineSeconds. func (dc *DeploymentController) checkPausedConditions(ctx context.Context, d *apps.Deployment) error { … } // getAllReplicaSetsAndSyncRevision returns all the replica sets for the provided deployment (new and all old), with new RS's and deployment's revision updated. // // rsList should come from getReplicaSetsForDeployment(d). // // 1. Get all old RSes this deployment targets, and calculate the max revision number among them (maxOldV). // 2. Get new RS this deployment targets (whose pod template matches deployment's), and update new RS's revision number to (maxOldV + 1), // only if its revision number is smaller than (maxOldV + 1). If this step failed, we'll update it in the next deployment sync loop. // 3. Copy new RS's revision number to deployment (update deployment's revision). If this step failed, we'll update it in the next deployment sync loop. // // Note that currently the deployment controller is using caches to avoid querying the server for reads. // This may lead to stale reads of replica sets, thus incorrect deployment status. func (dc *DeploymentController) getAllReplicaSetsAndSyncRevision(ctx context.Context, d *apps.Deployment, rsList []*apps.ReplicaSet, createIfNotExisted bool) (*apps.ReplicaSet, []*apps.ReplicaSet, error) { … } const maxRevHistoryLengthInChars … // Returns a replica set that matches the intent of the given deployment. Returns nil if the new replica set doesn't exist yet. // 1. Get existing new RS (the RS that the given deployment targets, whose pod template is the same as deployment's). // 2. If there's existing new RS, update its revision number if it's smaller than (maxOldRevision + 1), where maxOldRevision is the max revision number among all old RSes. // 3. If there's no existing new RS and createIfNotExisted is true, create one with appropriate revision number (maxOldRevision + 1) and replicas. // Note that the pod-template-hash will be added to adopted RSes and pods. func (dc *DeploymentController) getNewReplicaSet(ctx context.Context, d *apps.Deployment, rsList, oldRSs []*apps.ReplicaSet, createIfNotExisted bool) (*apps.ReplicaSet, error) { … } // scale scales proportionally in order to mitigate risk. Otherwise, scaling up can increase the size // of the new replica set and scaling down can decrease the sizes of the old ones, both of which would // have the effect of hastening the rollout progress, which could produce a higher proportion of unavailable // replicas in the event of a problem with the rolled out template. Should run only on scaling events or // when a deployment is paused and not during the normal rollout process. func (dc *DeploymentController) scale(ctx context.Context, deployment *apps.Deployment, newRS *apps.ReplicaSet, oldRSs []*apps.ReplicaSet) error { … } func (dc *DeploymentController) scaleReplicaSetAndRecordEvent(ctx context.Context, rs *apps.ReplicaSet, newScale int32, deployment *apps.Deployment) (bool, *apps.ReplicaSet, error) { … } func (dc *DeploymentController) scaleReplicaSet(ctx context.Context, rs *apps.ReplicaSet, newScale int32, deployment *apps.Deployment) (bool, *apps.ReplicaSet, error) { … } // cleanupDeployment is responsible for cleaning up a deployment ie. retains all but the latest N old replica sets // where N=d.Spec.RevisionHistoryLimit. Old replica sets are older versions of the podtemplate of a deployment kept // around by default 1) for historical reasons and 2) for the ability to rollback a deployment. func (dc *DeploymentController) cleanupDeployment(ctx context.Context, oldRSs []*apps.ReplicaSet, deployment *apps.Deployment) error { … } // syncDeploymentStatus checks if the status is up-to-date and sync it if necessary func (dc *DeploymentController) syncDeploymentStatus(ctx context.Context, allRSs []*apps.ReplicaSet, newRS *apps.ReplicaSet, d *apps.Deployment) error { … } // calculateStatus calculates the latest status for the provided deployment by looking into the provided replica sets. func calculateStatus(allRSs []*apps.ReplicaSet, newRS *apps.ReplicaSet, deployment *apps.Deployment) apps.DeploymentStatus { … } // isScalingEvent checks whether the provided deployment has been updated with a scaling event // by looking at the desired-replicas annotation in the active replica sets of the deployment. // // rsList should come from getReplicaSetsForDeployment(d). func (dc *DeploymentController) isScalingEvent(ctx context.Context, d *apps.Deployment, rsList []*apps.ReplicaSet) (bool, error) { … }
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