nodes

Documentation

Overview

Package nodes contains the Core Nodes Executor implementation and a subpackage for every node kind This module implements the core Nodes executor. This executor is the starting point for executing any node in the workflow. Since Nodes in a workflow are composable, i.e., one node may contain other nodes, the Node Handler is recursive in nature. This executor handles the core logic for all nodes, but specific logic for handling different kinds of nodes is delegated to the respective node handlers

Available node handlers are

• Task: Arguably the most important handler as it handles all tasks. These include all plugins. The goal of the workflow is is to run tasks, thus every workflow will contain atleast one TaskNode (except for the case, where the workflow is purely a meta-workflow and can run other workflows
• SubWorkflow: This is one of the most important handlers. It can execute Workflows that are nested inside a workflow
• DynamicTask Handler: This is just a decorator on the Task Handler. It handles cases, in which the Task returns a futures file. Every Task is actually executed through the DynamicTaskHandler
• Branch Handler: This handler is used to execute branches
• Start & End Node handler: these are nominal handlers for the start and end node and do no really carry a lot of logic

Index

• Constants
• func CreateAliasMap(aliases []v1alpha1.Alias) map[string]string
• func GetParentNodeMaxEndTime(ctx context.Context, dag executors.DAGStructure, nl executors.NodeLookup, ...) (t v1.Time, err error)
• func IsMaxParallelismAchieved(ctx context.Context, currentNode v1alpha1.ExecutableNode, ...) bool
• func IsTerminalNodePhase(p core.NodeExecution_Phase) bool
• func IsTerminalTaskPhase(p core.TaskExecution_Phase) bool
• func NewExecutor(ctx context.Context, nodeConfig config.NodeConfig, store *storage.DataStore, ...) (executors.Node, error)
• func ParseVarName(varName string) (idx *int, name string, err error)
• func Resolve(ctx context.Context, outputResolver OutputResolver, nl executors.NodeLookup, ...) (*core.LiteralMap, error)
• func ResolveBindingData(ctx context.Context, outputResolver OutputResolver, nl executors.NodeLookup, ...) (*core.Literal, error)
• func ToK8sTime(t time.Time) v1.Time
• func ToNodeExecEventPhase(p handler.EPhase) core.NodeExecution_Phase
• func ToNodeExecOutput(info *handler.OutputInfo) *event.NodeExecutionEvent_OutputUri
• func ToNodeExecTaskNodeMetadata(info *handler.TaskNodeInfo) *event.NodeExecutionEvent_TaskNodeMetadata
• func ToNodeExecWorkflowNodeMetadata(info *handler.WorkflowNodeInfo) *event.NodeExecutionEvent_WorkflowNodeMetadata
• func ToNodeExecutionEvent(nodeExecID *core.NodeExecutionIdentifier, info handler.PhaseInfo, ...) (*event.NodeExecutionEvent, error)
• func ToNodePhase(p handler.EPhase) (v1alpha1.NodePhase, error)
• func UpdateNodeStatus(np v1alpha1.NodePhase, p handler.PhaseInfo, n *nodeStateManager, ...)
• type HandlerFactory
  • func NewHandlerFactory(ctx context.Context, executor executors.Node, ...) (HandlerFactory, error)
• type OutputResolver
  • func NewRemoteFileOutputResolver(store *storage.DataStore) OutputResolver
• type PredicatePhase
  • func CanExecute(ctx context.Context, dag executors.DAGStructure, nl executors.NodeLookup, ...) (PredicatePhase, error)
  • func (p PredicatePhase) String() string
• type VarName

Constants

const NodeIDLabel = "node-id"

const NodeInterruptibleLabel = "interruptible"

const TaskNameLabel = "task-name"

Functions

func CreateAliasMap

func CreateAliasMap(aliases []v1alpha1.Alias) map[string]string

func GetParentNodeMaxEndTime

func GetParentNodeMaxEndTime(ctx context.Context, dag executors.DAGStructure, nl executors.NodeLookup, node v1alpha1.BaseNode) (t v1.Time, err error)

func IsMaxParallelismAchieved

func IsMaxParallelismAchieved(ctx context.Context, currentNode v1alpha1.ExecutableNode, currentPhase v1alpha1.NodePhase,
	execContext executors.ExecutionContext) bool

IsMaxParallelismAchieved checks if we have already achieved max parallelism. It returns true, if the desired max parallelism value is achieved, false otherwise MaxParallelism is defined as the maximum number of TaskNodes and LaunchPlans (together) that can be executed concurrently by one workflow execution. A setting of `0` indicates that it is disabled.

func IsTerminalNodePhase

func IsTerminalNodePhase(p core.NodeExecution_Phase) bool

IsTerminalNodePhase returns true if node phase is one of the terminal phases, else false

func IsTerminalTaskPhase

func IsTerminalTaskPhase(p core.TaskExecution_Phase) bool

IsTerminalTaskPhase returns true if task phase is terminal, else false

func NewExecutor

func NewExecutor(ctx context.Context, nodeConfig config.NodeConfig, store *storage.DataStore, enQWorkflow v1alpha1.EnqueueWorkflow, eventSink events.EventSink,
	workflowLauncher launchplan.Executor, launchPlanReader launchplan.Reader, maxDatasetSize int64,
	defaultRawOutputPrefix storage.DataReference, kubeClient executors.Client,
	catalogClient catalog.Client, recoveryClient recovery.Client, eventConfig *config.EventConfig, clusterID string, signalClient service.SignalServiceClient, scope promutils.Scope) (executors.Node, error)

func ParseVarName

func ParseVarName(varName string) (idx *int, name string, err error)

Parses var names

func Resolve

func Resolve(ctx context.Context, outputResolver OutputResolver, nl executors.NodeLookup, nodeID v1alpha1.NodeID, bindings []*v1alpha1.Binding) (*core.LiteralMap, error)

func ResolveBindingData

func ResolveBindingData(ctx context.Context, outputResolver OutputResolver, nl executors.NodeLookup, bindingData *core.BindingData) (*core.Literal, error)

func ToK8sTime

func ToK8sTime(t time.Time) v1.Time

func ToNodeExecEventPhase

func ToNodeExecEventPhase(p handler.EPhase) core.NodeExecution_Phase

func ToNodeExecOutput

func ToNodeExecOutput(info *handler.OutputInfo) *event.NodeExecutionEvent_OutputUri

func ToNodeExecTaskNodeMetadata

func ToNodeExecTaskNodeMetadata(info *handler.TaskNodeInfo) *event.NodeExecutionEvent_TaskNodeMetadata

func ToNodeExecWorkflowNodeMetadata

func ToNodeExecWorkflowNodeMetadata(info *handler.WorkflowNodeInfo) *event.NodeExecutionEvent_WorkflowNodeMetadata

func ToNodeExecutionEvent

func ToNodeExecutionEvent(nodeExecID *core.NodeExecutionIdentifier,
	info handler.PhaseInfo,
	inputPath string,
	status v1alpha1.ExecutableNodeStatus,
	eventVersion v1alpha1.EventVersion,
	parentInfo executors.ImmutableParentInfo,
	node v1alpha1.ExecutableNode, clusterID string, dynamicNodePhase v1alpha1.DynamicNodePhase) (*event.NodeExecutionEvent, error)

func ToNodePhase

func ToNodePhase(p handler.EPhase) (v1alpha1.NodePhase, error)

func UpdateNodeStatus

func UpdateNodeStatus(np v1alpha1.NodePhase, p handler.PhaseInfo, n *nodeStateManager, s v1alpha1.ExecutableNodeStatus)

Types

type HandlerFactory

type HandlerFactory interface {
	GetHandler(kind v1alpha1.NodeKind) (handler.Node, error)
	Setup(ctx context.Context, setup handler.SetupContext) error
}

func NewHandlerFactory

func NewHandlerFactory(ctx context.Context, executor executors.Node, workflowLauncher launchplan.Executor,
	launchPlanReader launchplan.Reader, kubeClient executors.Client, client catalog.Client, recoveryClient recovery.Client,
	eventConfig *config.EventConfig, clusterID string, signalClient service.SignalServiceClient, scope promutils.Scope) (HandlerFactory, error)

type OutputResolver

type OutputResolver interface {
	// Extracts a subset of node outputs to literals.
	ExtractOutput(ctx context.Context, nl executors.NodeLookup, n v1alpha1.ExecutableNode,
		bindToVar VarName) (values *core.Literal, err error)
}

func NewRemoteFileOutputResolver

func NewRemoteFileOutputResolver(store *storage.DataStore) OutputResolver

Creates a simple output resolver that expects an outputs.pb at the data directory of the node.

type PredicatePhase

type PredicatePhase int

Special enum to indicate if the node under consideration is ready to be executed or should be skipped

const (
	// Indicates node is not yet ready to be executed
	PredicatePhaseNotReady PredicatePhase = iota
	// Indicates node is ready to be executed - execution should proceed
	PredicatePhaseReady
	// Indicates that the node execution should be skipped as one of its parents was skipped or the branch was not taken
	PredicatePhaseSkip
	// Indicates failure during Predicate check
	PredicatePhaseUndefined
)

func CanExecute

func CanExecute(ctx context.Context, dag executors.DAGStructure, nl executors.NodeLookup, node v1alpha1.BaseNode) (
	PredicatePhase, error)

CanExecute method informs the callee if the given node can begin execution. This is dependent on primarily that all nodes upstream to the given node are successful and the results are available.

func (PredicatePhase) String

func (p PredicatePhase) String() string

type VarName

type VarName = string