podtask

package
v1.2.0-alpha.1....-877bfa6 Latest Latest
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 Go to latest Published: Oct 15, 2015 License: Apache-2.0 Imports: 20 Imported by: 0

Documentation

Overview

Package podtask maps Kubernetes pods to Mesos tasks.

Index

Constants

View Source 
const (
	Launched = FlagType("launched")
	Bound    = FlagType("bound")
	Deleted  = FlagType("deleted")
)
View Source 
const (
	//TODO(jdef) move this somewhere else
	PodPath = "/pods"
)
View Source 
const PortMappingLabelKey = "k8s.mesosphere.io/portMapping"

Variables

View Source 
var (
	DefaultMinimalPredicate = RequireAllPredicate([]FitPredicate{
		ValidationPredicate,
		NodeSelectorPredicate,
		MinimalPodResourcesPredicate,
		PortsPredicate,
	}).Fit

	DefaultMinimalProcurement = AllOrNothingProcurement([]Procurement{
		ValidateProcurement,
		NodeProcurement,
		MinimalPodResourcesProcurement,
		PortsProcurement,
	}).Procure
)

Functions

func InstallDebugHandlers 

func InstallDebugHandlers(reg Registry, mux *http.ServeMux)

TODO(jdef) we use a Locker to guard against concurrent task state changes, but it would be really, really nice to avoid doing this. Maybe someday the registry won't return data ptrs but plain structs instead.

func MakePodKey 

func MakePodKey(ctx api.Context, id string) (string, error)

makePodKey constructs etcd paths to pod items enforcing namespace rules.

func MinimalPodResourcesPredicate 

func MinimalPodResourcesPredicate(t *T, offer *mesos.Offer, _ *api.Node) bool

func MinimalPodResourcesProcurement 

func MinimalPodResourcesProcurement(t *T, details *mesos.Offer) error

func NewPodFitsResourcesPredicate 

func NewPodFitsResourcesPredicate(c mresource.CPUShares, m mresource.MegaBytes) func(t *T, offer *mesos.Offer, _ *api.Node) bool

func NodeProcurement 

func NodeProcurement(t *T, offer *mesos.Offer) error

NodeProcurement updates t.Spec in preparation for the task to be launched on the slave associated with the offer.

func NodeSelectorPredicate 

func NodeSelectorPredicate(t *T, offer *mesos.Offer, n *api.Node) bool

func ParsePodStatusResult 

func ParsePodStatusResult(taskStatus *mesos.TaskStatus) (result api.PodStatusResult, err error)

func PodResourcesProcurement 

func PodResourcesProcurement(t *T, offer *mesos.Offer) error

PodResourcesProcurement converts k8s pod cpu and memory resource requirements into mesos resource allocations.

func PortsPredicate 

func PortsPredicate(t *T, offer *mesos.Offer, _ *api.Node) bool

func PortsProcurement 

func PortsProcurement(t *T, offer *mesos.Offer) error

PortsProcurement convert host port mappings into mesos port resource allocations.

func ValidateProcurement 

func ValidateProcurement(t *T, offer *mesos.Offer) error

ValidateProcurement checks that the offered resources are kosher, and if not panics. If things check out ok, t.Spec is cleared and nil is returned.

func ValidationPredicate 

func ValidationPredicate(t *T, offer *mesos.Offer, _ *api.Node) bool

Types

type AllOrNothingProcurement 

type AllOrNothingProcurement []Procurement

AllOrNothingProcurement provides a convenient wrapper around multiple Procurement objectives: the failure of any Procurement in the set results in Procure failing. see AllOrNothingProcurement.Procure

func (AllOrNothingProcurement) Procure 

func (a AllOrNothingProcurement) Procure(t *T, offer *mesos.Offer) error

Procure runs each Procurement in the receiver list. The first Procurement func that fails triggers T.Reset() and the error is returned, otherwise returns nil.

type DuplicateHostPortError 

type DuplicateHostPortError struct {
	// contains filtered or unexported fields
}

func (*DuplicateHostPortError) Error 

func (err *DuplicateHostPortError) Error() string

type FitPredicate 

type FitPredicate func(*T, *mesos.Offer, *api.Node) bool

FitPredicate implementations determine if the given task "fits" into offered Mesos resources. Neither the task or offer should be modified. Note that the node can be nil.

func NewDefaultPredicate 

func NewDefaultPredicate(c mresource.CPUShares, m mresource.MegaBytes) FitPredicate

type FlagType 

type FlagType string

type HostPortMapper 

type HostPortMapper interface {
	// abstracts the way that host ports are mapped to pod container ports
	Generate(t *T, offer *mesos.Offer) ([]HostPortMapping, error)
}

type HostPortMapping 

type HostPortMapping struct {
	ContainerIdx int // index of the container in the pod spec
	PortIdx      int // index of the port in a container's port spec
	OfferPort    uint64
}

type HostPortMappingType 

type HostPortMappingType string
const (
	// maps a Container.HostPort to the same exact offered host port, ignores .HostPort = 0
	HostPortMappingFixed HostPortMappingType = "fixed"
	// same as HostPortMappingFixed, except that .HostPort of 0 are mapped to any port offered
	HostPortMappingWildcard = "wildcard"
)

func MappingTypeForPod 

func MappingTypeForPod(pod *api.Pod) HostPortMappingType

func (HostPortMappingType) Generate 

func (self HostPortMappingType) Generate(t *T, offer *mesos.Offer) ([]HostPortMapping, error)

type PortAllocationError 

type PortAllocationError struct {
	PodId string
	Ports []uint64
}

func (*PortAllocationError) Error 

func (err *PortAllocationError) Error() string

type Procurement 

type Procurement func(*T, *mesos.Offer) error

Procurement funcs allocate resources for a task from an offer. Both the task and/or offer may be modified.

func NewDefaultProcurement 

func NewDefaultProcurement(c mresource.CPUShares, m mresource.MegaBytes) Procurement

NewDefaultProcurement returns the default procurement strategy that combines validation and responsible Mesos resource procurement. c and m are resource quantities written into k8s api.Pod.Spec's that don't declare resources (all containers in k8s-mesos require cpu and memory limits).

type Registry 

type Registry interface {
	// register the specified task with this registry, as long as the current error
	// condition is nil. if no errors occur then return a copy of the registered task.
	Register(*T, error) (*T, error)

	// unregister the specified task from this registry
	Unregister(*T)

	// update state for the registered task identified by task.ID, returning a copy of
	// the updated task, if any.
	Update(task *T) error

	// return the task registered for the specified task ID and its current state.
	// if there is no such task then StateUnknown is returned.
	Get(taskId string) (task *T, currentState StateType)

	// return the non-terminal task corresponding to the specified pod ID
	ForPod(podID string) (task *T, currentState StateType)

	// update the task status given the specified mesos task status update, returning a
	// copy of the updated task (if any) and its state.
	UpdateStatus(status *mesos.TaskStatus) (*T, StateType)

	// return a list of task ID's that match the given filter, or all task ID's if filter == nil.
	List(filter func(*T) bool) []*T
}

state store for pod tasks

func NewInMemoryRegistry 

func NewInMemoryRegistry() Registry

type RequireAllPredicate 

type RequireAllPredicate []FitPredicate

func (RequireAllPredicate) Fit 

func (f RequireAllPredicate) Fit(t *T, offer *mesos.Offer, n *api.Node) bool

type RequireSomePodResources 

type RequireSomePodResources struct {
	// contains filtered or unexported fields
}

func (*RequireSomePodResources) Procure 

func (r *RequireSomePodResources) Procure(t *T, offer *mesos.Offer) error

type Spec 

type Spec struct {
	SlaveID       string
	AssignedSlave string
	CPU           mresource.CPUShares
	Memory        mresource.MegaBytes
	PortMap       []HostPortMapping
	Ports         []uint64
	Data          []byte
}

type StateType 

type StateType int
const (
	StatePending StateType = iota
	StateRunning
	StateFinished
	StateUnknown
)

type T 

type T struct {
	ID          string
	Pod         api.Pod
	Spec        Spec
	Offer       offers.Perishable // thread-safe
	State       StateType
	Flags       map[FlagType]struct{}
	CreateTime  time.Time
	UpdatedTime time.Time // time of the most recent StatusUpdate we've seen from the mesos master
	// contains filtered or unexported fields
}

A struct that describes a pod task.

func New 

func New(ctx api.Context, id string, pod api.Pod, executor *mesos.ExecutorInfo) (*T, error)

func RecoverFrom 

func RecoverFrom(pod api.Pod) (*T, bool, error)

reconstruct a task from metadata stashed in a pod entry. there are limited pod states that support reconstruction. if we expect to be able to reconstruct state but encounter errors in the process then those errors are returned. if the pod is in a seemingly valid state but otherwise does not support task reconstruction return false. if we're able to reconstruct state then return a reconstructed task and true.

at this time task reconstruction is only supported for pods that have been annotated with binding metadata, which implies that they've previously been associated with a task and that mesos knows about it.

assumes that the pod data comes from the k8s registry and reflects the desired state.

func (*T) BuildTaskInfo 

func (t *T) BuildTaskInfo() *mesos.TaskInfo

func (*T) Clone 

func (t *T) Clone() *T

mostly-clone this pod task. the clone will actually share the some fields:

  • executor // OK because it's read only
  • Offer // OK because it's guarantees safe concurrent access

func (*T) GetOfferId 

func (t *T) GetOfferId() string

func (*T) Has 

func (t *T) Has(f FlagType) (exists bool)

func (*T) HasAcceptedOffer 

func (t *T) HasAcceptedOffer() bool

func (*T) Reset 

func (t *T) Reset()

Clear offer-related details from the task, should be called if/when an offer has already been assigned to a task but for some reason is no longer valid.

func (*T) SaveRecoveryInfo 

func (t *T) SaveRecoveryInfo(dict map[string]string)

func (*T) Set 

func (t *T) Set(f FlagType)

Source Files

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