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Add more comments and rename getAllReplicaSets to getAllReplicaSetsAndSyncRevision

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This commit is contained in:
Janet Kuo 2016-03-02 17:51:35 -08:00
parent e42eab59bc
commit 48dc694ba6
1 changed files with 16 additions and 10 deletions
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26
pkg/controller/deployment/deployment_controller.go
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@ -452,7 +452,7 @@ func (dc *DeploymentController) syncDeployment(key string) error {
// Updates the status of a paused deployment
func (dc *DeploymentController) syncPausedDeploymentStatus(deployment *extensions.Deployment) error {
newRS, oldRSs, err := dc.getAllReplicaSets(deployment, false)
newRS, oldRSs, err := dc.getAllReplicaSetsAndSyncRevision(deployment, false)
if err != nil {
return err
}
@ -464,7 +464,7 @@ func (dc *DeploymentController) syncPausedDeploymentStatus(deployment *extension
// Rolling back to a revision; no-op if the toRevision is deployment's current revision
func (dc *DeploymentController) rollback(deployment *extensions.Deployment, toRevision *int64) (*extensions.Deployment, error) {
newRS, allOldRSs, err := dc.getAllReplicaSets(deployment, true)
newRS, allOldRSs, err := dc.getAllReplicaSetsAndSyncRevision(deployment, true)
if err != nil {
return nil, err
}
@ -517,7 +517,7 @@ func (dc *DeploymentController) updateDeploymentAndClearRollbackTo(deployment *e
func (dc *DeploymentController) syncRecreateDeployment(deployment *extensions.Deployment) error {
// Don't create a new RS if not already existed, so that we avoid scaling up before scaling down
newRS, oldRSs, err := dc.getAllReplicaSets(deployment, false)
newRS, oldRSs, err := dc.getAllReplicaSetsAndSyncRevision(deployment, false)
if err != nil {
return err
}
@ -536,7 +536,7 @@ func (dc *DeploymentController) syncRecreateDeployment(deployment *extensions.De
// If we need to create a new RS, create it now
// TODO: Create a new RS without re-listing all RSs.
if newRS == nil {
newRS, oldRSs, err = dc.getAllReplicaSets(deployment, true)
newRS, oldRSs, err = dc.getAllReplicaSetsAndSyncRevision(deployment, true)
if err != nil {
return err
}
@ -563,7 +563,7 @@ func (dc *DeploymentController) syncRecreateDeployment(deployment *extensions.De
}
func (dc *DeploymentController) syncRollingUpdateDeployment(deployment *extensions.Deployment) error {
newRS, oldRSs, err := dc.getAllReplicaSets(deployment, true)
newRS, oldRSs, err := dc.getAllReplicaSetsAndSyncRevision(deployment, true)
if err != nil {
return err
}
@ -610,13 +610,18 @@ func (dc *DeploymentController) syncDeploymentStatus(allRSs []*extensions.Replic
return nil
}
// getAllReplicaSets returns all the replica sets for the provided deployment (new and all old).
func (dc *DeploymentController) getAllReplicaSets(deployment *extensions.Deployment, createIfNotExisted bool) (*extensions.ReplicaSet, []*extensions.ReplicaSet, error) {
// getAllReplicaSetsAndSyncRevision returns all the replica sets for the provided deployment (new and all old), with new RS's and deployment's revision updated.
// 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.
func (dc *DeploymentController) getAllReplicaSetsAndSyncRevision(deployment *extensions.Deployment, createIfNotExisted bool) (*extensions.ReplicaSet, []*extensions.ReplicaSet, error) {
_, allOldRSs, err := dc.getOldReplicaSets(deployment)
if err != nil {
return nil, nil, err
}
// Calculate the max revision number among all old RSes
maxOldV := maxRevision(allOldRSs)
// Get new replica set with the updated revision number
@ -680,8 +685,9 @@ func (dc *DeploymentController) getOldReplicaSets(deployment *extensions.Deploym
}
// Returns a replica set that matches the intent of the given deployment.
// It creates a new replica set if required.
// The revision of the new replica set will be updated to maxOldRevision + 1
// 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.
func (dc *DeploymentController) getNewReplicaSet(deployment *extensions.Deployment, maxOldRevision int64, oldRSs []*extensions.ReplicaSet, createIfNotExisted bool) (*extensions.ReplicaSet, error) {
// Calculate revision number for this new replica set
newRevision := strconv.FormatInt(maxOldRevision+1, 10)
@ -752,7 +758,7 @@ func (dc *DeploymentController) getNewReplicaSet(deployment *extensions.Deployme
// setNewReplicaSetAnnotations sets new replica set's annotations appropriately by updating its revision and
// copying required deployment annotations to it; it returns true if replica set's annotation is changed.
func setNewReplicaSetAnnotations(deployment *extensions.Deployment, newRS *extensions.ReplicaSet, newRevision string) bool {
// First, copy deployment's annotations
// First, copy deployment's annotations (except for apply and revision annotations)
annotationChanged := copyDeploymentAnnotationsToReplicaSet(deployment, newRS)
// Then, update replica set's revision annotation
if newRS.Annotations == nil {