org.apache.flink.optimizer.dag

类 DataSourceNode

java.lang.Object

org.apache.flink.optimizer.dag.OptimizerNode

org.apache.flink.optimizer.dag.DataSourceNode

所有已实现的接口:

EstimateProvider, DumpableNode<OptimizerNode>, org.apache.flink.util.Visitable<OptimizerNode>

public class DataSourceNode
extends OptimizerNode

The optimizer's internal representation of a data source.

嵌套类概要

从类继承的嵌套类/接口 org.apache.flink.optimizer.dag.OptimizerNode

OptimizerNode.UnclosedBranchDescriptor

字段概要

从类继承的字段 org.apache.flink.optimizer.dag.OptimizerNode

cachedPlans, closedBranchingNodes, costWeight, estimatedNumRecords, estimatedOutputSize, hereJoinedBranches, id, MAX_DYNAMIC_PATH_COST_WEIGHT, onDynamicPath, openBranches, uniqueFields

构造器概要

构造器

构造器和说明
DataSourceNode(org.apache.flink.api.common.operators.GenericDataSourceBase<?,?> pactContract) Creates a new DataSourceNode for the given contract.

方法概要

限定符和类型	方法和说明
void	accept(org.apache.flink.util.Visitor<OptimizerNode> visitor) This method implements the visit of a depth-first graph traversing visitor.
void	computeInterestingPropertiesForInputs(CostEstimator estimator) Tells the node to compute the interesting properties for its inputs.
protected void	computeOperatorSpecificDefaultEstimates(DataStatistics statistics)
void	computeUnclosedBranchStack() This method causes the node to compute the description of open branches in its sub-plan.
List<PlanNode>	getAlternativePlans(CostEstimator estimator) Computes the plan alternatives for this node, an implicitly for all nodes that are children of this node.
List<DagConnection>	getIncomingConnections() Gets all incoming connections of this node.
org.apache.flink.api.common.operators.GenericDataSourceBase<?,?>	getOperator() Gets the contract object for this data source node.
String	getOperatorName() Gets the name of this node, which is the name of the function/operator, or data source / data sink.
org.apache.flink.api.common.operators.SemanticProperties	getSemanticProperties()
void	setInput(Map<org.apache.flink.api.common.operators.Operator<?>,OptimizerNode> contractToNode, org.apache.flink.api.common.ExecutionMode defaultDataExchangeMode) This function connects the predecessors to this operator.
void	setParallelism(int parallelism) Sets the parallelism for this optimizer node.

从类继承的方法 org.apache.flink.optimizer.dag.OptimizerNode

addBroadcastConnection, addClosedBranch, addClosedBranches, addOutgoingConnection, areBranchCompatible, clearInterestingProperties, computeOutputEstimates, computeUnclosedBranchStackForBroadcastInputs, computeUnionOfInterestingPropertiesFromSuccessors, getBranchesForParent, getBroadcastConnectionNames, getBroadcastConnections, getClosedBranchingNodes, getCostWeight, getDumpableInputs, getEstimatedAvgWidthPerOutputRecord, getEstimatedNumRecords, getEstimatedOutputSize, getId, getInterestingProperties, getMaxDepth, getMinimalMemoryAcrossAllSubTasks, getOpenBranches, getOptimizerNode, getOutgoingConnections, getParallelism, getPlanNode, getPredecessors, getUniqueFields, hasUnclosedBranches, haveAllOutputConnectionInterestingProperties, identifyDynamicPath, initId, isBranching, isOnDynamicPath, markAllOutgoingConnectionsAsPipelineBreaking, mergeLists, prunePlanAlternatives, prunePlanAlternativesWithCommonBranching, readStubAnnotations, readUniqueFieldsAnnotation, removeClosedBranches, setBroadcastInputs, setEstimatedNumRecords, setEstimatedOutputSize, toString

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

DataSourceNode

public DataSourceNode(org.apache.flink.api.common.operators.GenericDataSourceBase<?,?> pactContract)

Creates a new DataSourceNode for the given contract.

参数:

pactContract - The data source contract object.

方法详细资料

getOperator

public org.apache.flink.api.common.operators.GenericDataSourceBase<?,?> getOperator()

Gets the contract object for this data source node.

覆盖:

getOperator 在类中 OptimizerNode

返回:

The contract.

getOperatorName

public String getOperatorName()

从类复制的说明: OptimizerNode

Gets the name of this node, which is the name of the function/operator, or data source / data sink.

指定者:

getOperatorName 在类中 OptimizerNode

返回:

The node name.

setParallelism

public void setParallelism(int parallelism)

从类复制的说明: OptimizerNode

Sets the parallelism for this optimizer node. The parallelism denotes how many parallel instances of the operator will be spawned during the execution.

覆盖:

setParallelism 在类中 OptimizerNode

参数:

parallelism - The parallelism to set. If this value is ExecutionConfig.PARALLELISM_DEFAULT then the system will take the default number of parallel instances.

getIncomingConnections

public List<DagConnection> getIncomingConnections()

从类复制的说明: OptimizerNode

Gets all incoming connections of this node. This method needs to be overridden by subclasses to return the children.

指定者:

getIncomingConnections 在类中 OptimizerNode

返回:

The list of incoming connections.

setInput

public void setInput(Map<org.apache.flink.api.common.operators.Operator<?>,OptimizerNode> contractToNode,
                     org.apache.flink.api.common.ExecutionMode defaultDataExchangeMode)

从类复制的说明: OptimizerNode

This function connects the predecessors to this operator.

指定者:

setInput 在类中 OptimizerNode

参数:

contractToNode - The map from program operators to optimizer nodes.

defaultDataExchangeMode - The data exchange mode to use, if the operator does not specify one.

computeOperatorSpecificDefaultEstimates

protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics)

指定者:

computeOperatorSpecificDefaultEstimates 在类中 OptimizerNode

computeInterestingPropertiesForInputs

public void computeInterestingPropertiesForInputs(CostEstimator estimator)

从类复制的说明: OptimizerNode

Tells the node to compute the interesting properties for its inputs. The interesting properties for the node itself must have been computed before. The node must then see how many of interesting properties it preserves and add its own.

指定者:

computeInterestingPropertiesForInputs 在类中 OptimizerNode

参数:

estimator - The CostEstimator instance to use for plan cost estimation.

computeUnclosedBranchStack

public void computeUnclosedBranchStack()

从类复制的说明: OptimizerNode

This method causes the node to compute the description of open branches in its sub-plan. An open branch describes, that a (transitive) child node had multiple outputs, which have not all been re-joined in the sub-plan. This method needs to set the openBranches field to a stack of unclosed branches, the latest one top. A branch is considered closed, if some later node sees all of the branching node's outputs, no matter if there have been more branches to different paths in the meantime.

指定者:

computeUnclosedBranchStack 在类中 OptimizerNode

getAlternativePlans

public List<PlanNode> getAlternativePlans(CostEstimator estimator)

从类复制的说明: OptimizerNode

Computes the plan alternatives for this node, an implicitly for all nodes that are children of this node. This method must determine for each alternative the global and local properties and the costs. This method may recursively call getAlternatives() on its children to get their plan alternatives, and build its own alternatives on top of those.

指定者:

getAlternativePlans 在类中 OptimizerNode

参数:

estimator - The cost estimator used to estimate the costs of each plan alternative.

返回:

A list containing all plan alternatives.

getSemanticProperties

public org.apache.flink.api.common.operators.SemanticProperties getSemanticProperties()

指定者:

getSemanticProperties 在类中 OptimizerNode

accept

public void accept(org.apache.flink.util.Visitor<OptimizerNode> visitor)

从类复制的说明: OptimizerNode

This method implements the visit of a depth-first graph traversing visitor. Implementers must first call the preVisit() method, then hand the visitor to their children, and finally call the postVisit() method.

指定者:

accept 在接口中 org.apache.flink.util.Visitable<OptimizerNode>

指定者:

accept 在类中 OptimizerNode

参数:

visitor - The graph traversing visitor.

另请参阅:

Visitable.accept(org.apache.flink.util.Visitor)