View Source
const (
	// NodeHealthUpdateRetry controls the number of retries of writing
	// node health update.
	NodeHealthUpdateRetry = 5
	// NodeEvictionPeriod controls how often NodeController will try to
	// evict Pods from non-responsive Nodes.
	NodeEvictionPeriod = 100 * time.Millisecond
	// EvictionRateLimiterBurst is the burst value for all eviction rate
	// limiters
	EvictionRateLimiterBurst = 1
View Source
const (

	// NodeUpdateChannelSize defines the size of channel for node update events.
	NodeUpdateChannelSize = 10
	// UpdateWorkerSize defines the size of workers for node update or/and pod update.
	UpdateWorkerSize = 8


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type ActionFunc

type ActionFunc func(TimedValue) (bool, time.Duration)

    ActionFunc takes a timed value and returns false if the item must be retried, with an optional time.Duration if some minimum wait interval should be used.

    type GetNodeFunc

    type GetNodeFunc func(name string) (*v1.Node, error)

      GetNodeFunc returns the node for the specified name, or a NotFound error if missing.

      type GetPodFunc

      type GetPodFunc func(name, namespace string) (*v1.Pod, error)

        GetPodFunc returns the pod for the specified name/namespace, or a NotFound error if missing.

        type GetPodsByNodeNameFunc

        type GetPodsByNodeNameFunc func(nodeName string) ([]v1.Pod, error)

          GetPodsByNodeNameFunc returns the list of pods assigned to the specified node.

          type NoExecuteTaintManager

          type NoExecuteTaintManager struct {
          	// contains filtered or unexported fields

            NoExecuteTaintManager listens to Taint/Toleration changes and is responsible for removing Pods from Nodes tainted with NoExecute Taints.

            func NewNoExecuteTaintManager

            func NewNoExecuteTaintManager(c clientset.Interface, getPod GetPodFunc, getNode GetNodeFunc, getPodsAssignedToNode GetPodsByNodeNameFunc) *NoExecuteTaintManager

              NewNoExecuteTaintManager creates a new NoExecuteTaintManager that will use passed clientset to communicate with the API server.

              func (*NoExecuteTaintManager) NodeUpdated

              func (tc *NoExecuteTaintManager) NodeUpdated(oldNode *v1.Node, newNode *v1.Node)

                NodeUpdated is used to notify NoExecuteTaintManager about Node changes.

                func (*NoExecuteTaintManager) PodUpdated

                func (tc *NoExecuteTaintManager) PodUpdated(oldPod *v1.Pod, newPod *v1.Pod)

                  PodUpdated is used to notify NoExecuteTaintManager about Pod changes.

                  func (*NoExecuteTaintManager) Run

                  func (tc *NoExecuteTaintManager) Run(stopCh <-chan struct{})

                    Run starts NoExecuteTaintManager which will run in loop until `stopCh` is closed.

                    type RateLimitedTimedQueue

                    type RateLimitedTimedQueue struct {
                    	// contains filtered or unexported fields

                      RateLimitedTimedQueue is a unique item priority queue ordered by the expected next time of execution. It is also rate limited.

                      func NewRateLimitedTimedQueue

                      func NewRateLimitedTimedQueue(limiter flowcontrol.RateLimiter) *RateLimitedTimedQueue

                        NewRateLimitedTimedQueue creates new queue which will use given RateLimiter to oversee execution.

                        func (*RateLimitedTimedQueue) Add

                        func (q *RateLimitedTimedQueue) Add(value string, uid interface{}) bool

                          Add value to the queue to be processed. Won't add the same value(comparison by value) a second time if it was already added and not removed.

                          func (*RateLimitedTimedQueue) Clear

                          func (q *RateLimitedTimedQueue) Clear()

                            Clear removes all items from the queue

                            func (*RateLimitedTimedQueue) Remove

                            func (q *RateLimitedTimedQueue) Remove(value string) bool

                              Remove Node from the Evictor. The Node won't be processed until added again.

                              func (*RateLimitedTimedQueue) SwapLimiter

                              func (q *RateLimitedTimedQueue) SwapLimiter(newQPS float32)

                                SwapLimiter safely swaps current limiter for this queue with the passed one if capacities or qps's differ.

                                func (*RateLimitedTimedQueue) Try

                                func (q *RateLimitedTimedQueue) Try(fn ActionFunc)

                                  Try processes the queue.Ends prematurely if RateLimiter forbids an action and leak is true. Otherwise, requeues the item to be processed. Each value is processed once if fn returns true, otherwise it is added back to the queue. The returned remaining is used to identify the minimum time to execute the next item in the queue. The same value is processed only once unless Remove is explicitly called on it (it's done by the cancelPodEviction function in NodeController when Node becomes Ready again) TODO: figure out a good way to do garbage collection for all Nodes that were removed from the cluster.

                                  type TimedQueue

                                  type TimedQueue []*TimedValue

                                    TimedQueue is a priority heap where the lowest ProcessAt is at the front of the queue

                                    func (TimedQueue) Len

                                    func (h TimedQueue) Len() int

                                      Len is the length of the queue.

                                      func (TimedQueue) Less

                                      func (h TimedQueue) Less(i, j int) bool

                                        Less returns true if queue[i] < queue[j].

                                        func (*TimedQueue) Pop

                                        func (h *TimedQueue) Pop() interface{}

                                          Pop the lowest ProcessAt item.

                                          func (*TimedQueue) Push

                                          func (h *TimedQueue) Push(x interface{})

                                            Push a new TimedValue on to the queue.

                                            func (TimedQueue) Swap

                                            func (h TimedQueue) Swap(i, j int)

                                              Swap swaps index i and j.

                                              type TimedValue

                                              type TimedValue struct {
                                              	Value string
                                              	// UID could be anything that helps identify the value
                                              	UID       interface{}
                                              	AddedAt   time.Time
                                              	ProcessAt time.Time

                                                TimedValue is a value that should be processed at a designated time.

                                                type TimedWorker

                                                type TimedWorker struct {
                                                	WorkItem  *WorkArgs
                                                	CreatedAt time.Time
                                                	FireAt    time.Time
                                                	Timer     *time.Timer

                                                  TimedWorker is a responsible for executing a function no earlier than at FireAt time.

                                                  func CreateWorker

                                                  func CreateWorker(args *WorkArgs, createdAt time.Time, fireAt time.Time, f func(args *WorkArgs) error) *TimedWorker

                                                    CreateWorker creates a TimedWorker that will execute `f` not earlier than `fireAt`.

                                                    func (*TimedWorker) Cancel

                                                    func (w *TimedWorker) Cancel()

                                                      Cancel cancels the execution of function by the `TimedWorker`

                                                      type TimedWorkerQueue

                                                      type TimedWorkerQueue struct {
                                                      	// contains filtered or unexported fields

                                                        TimedWorkerQueue keeps a set of TimedWorkers that are still wait for execution.

                                                        func CreateWorkerQueue

                                                        func CreateWorkerQueue(f func(args *WorkArgs) error) *TimedWorkerQueue

                                                          CreateWorkerQueue creates a new TimedWorkerQueue for workers that will execute given function `f`.

                                                          func (*TimedWorkerQueue) AddWork

                                                          func (q *TimedWorkerQueue) AddWork(args *WorkArgs, createdAt time.Time, fireAt time.Time)

                                                            AddWork adds a work to the WorkerQueue which will be executed not earlier than `fireAt`.

                                                            func (*TimedWorkerQueue) CancelWork

                                                            func (q *TimedWorkerQueue) CancelWork(key string) bool

                                                              CancelWork removes scheduled function execution from the queue. Returns true if work was cancelled.

                                                              func (*TimedWorkerQueue) GetWorkerUnsafe

                                                              func (q *TimedWorkerQueue) GetWorkerUnsafe(key string) *TimedWorker

                                                                GetWorkerUnsafe returns a TimedWorker corresponding to the given key. Unsafe method - workers have attached goroutines which can fire afater this function is called.

                                                                type UniqueQueue

                                                                type UniqueQueue struct {
                                                                	// contains filtered or unexported fields

                                                                  UniqueQueue is a FIFO queue which additionally guarantees that any element can be added only once until it is removed.

                                                                  func (*UniqueQueue) Add

                                                                  func (q *UniqueQueue) Add(value TimedValue) bool

                                                                    Add a new value to the queue if it wasn't added before, or was explicitly removed by the Remove call. Returns true if new value was added.

                                                                    func (*UniqueQueue) Clear

                                                                    func (q *UniqueQueue) Clear()

                                                                      Clear removes all items from the queue and duplication preventing set.

                                                                      func (*UniqueQueue) Get

                                                                      func (q *UniqueQueue) Get() (TimedValue, bool)

                                                                        Get returns the oldest added value that wasn't returned yet.

                                                                        func (*UniqueQueue) Head

                                                                        func (q *UniqueQueue) Head() (TimedValue, bool)

                                                                          Head returns the oldest added value that wasn't returned yet without removing it.

                                                                          func (*UniqueQueue) Remove

                                                                          func (q *UniqueQueue) Remove(value string) bool

                                                                            Remove the value from the queue, so Get() call won't return it, and allow subsequent addition of the given value. If the value is not present does nothing and returns false.

                                                                            func (*UniqueQueue) RemoveFromQueue

                                                                            func (q *UniqueQueue) RemoveFromQueue(value string) bool

                                                                              RemoveFromQueue the value from the queue, but keeps it in the set, so it won't be added second time. Returns true if something was removed.

                                                                              func (*UniqueQueue) Replace

                                                                              func (q *UniqueQueue) Replace(value TimedValue) bool

                                                                                Replace replaces an existing value in the queue if it already exists, otherwise it does nothing. Returns true if the item was found.

                                                                                type WorkArgs

                                                                                type WorkArgs struct {
                                                                                	NamespacedName types.NamespacedName

                                                                                  WorkArgs keeps arguments that will be passed to the function executed by the worker.

                                                                                  func NewWorkArgs

                                                                                  func NewWorkArgs(name, namespace string) *WorkArgs

                                                                                    NewWorkArgs is a helper function to create new `WorkArgs`

                                                                                    func (*WorkArgs) KeyFromWorkArgs

                                                                                    func (w *WorkArgs) KeyFromWorkArgs() string

                                                                                      KeyFromWorkArgs creates a key for the given `WorkArgs`