Package org.apache.wayang.spark.operators

Class SparkCountOperator<Type>

java.lang.Object

org.apache.wayang.core.plan.wayangplan.OperatorBase

org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator<Type,Long>

org.apache.wayang.basic.operators.CountOperator<Type>

org.apache.wayang.spark.operators.SparkCountOperator<Type>

All Implemented Interfaces:

Serializable, ActualOperator, ElementaryOperator, ExecutionOperator, Operator, SparkExecutionOperator

public class SparkCountOperator<Type>
extends CountOperator<Type>
implements SparkExecutionOperator

Spark implementation of the CountOperator.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

OperatorBase.GsonSerializer

Field Summary

Fields inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

inputSlots, outputSlots, STANDARD_OPERATOR_ARGS

Fields inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

FIRST_EPOCH

Constructor Summary

Constructors

Constructor	Description
SparkCountOperator(CountOperator<Type> that)	Copies an instance (exclusive of broadcasts).
SparkCountOperator(DataSetType<Type> type)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
boolean	containsAction()	Tell whether this instances is a Spark action.
protected ExecutionOperator	createCopy()
Tuple<Collection<ExecutionLineageNode>,Collection<ChannelInstance>>	evaluate(ChannelInstance[] inputs, ChannelInstance[] outputs, SparkExecutor sparkExecutor, OptimizationContext.OperatorContext operatorContext)	Evaluates this operator.
String	getLoadProfileEstimatorConfigurationKey()
List<ChannelDescriptor>	getSupportedInputChannels(int index)	Display the supported Channels for a certain InputSlot.
List<ChannelDescriptor>	getSupportedOutputChannels(int index)	Display the supported Channels for a certain OutputSlot.

Methods inherited from class org.apache.wayang.basic.operators.CountOperator

createCardinalityEstimator

Methods inherited from class org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator

getInput, getInputType, getOutput, getOutputType

Methods inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

accept, addBroadcastInput, addTargetPlatform, at, collectMappedInputSlots, collectMappedOutputSlots, copy, getAllInputs, getAllOutputs, getCardinalityEstimator, getContainer, getEpoch, getName, getOriginal, getSimpleClassName, getTargetPlatforms, isAuxiliary, isSupportingBroadcastInputs, propagateInputCardinality, propagateOutputCardinality, setAuxiliary, setCardinalityEstimator, setContainer, setEpoch, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ActualOperator

accept

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ElementaryOperator

createCardinalityEstimator, getCardinalityEstimator, isAuxiliary, setAuxiliary, setCardinalityEstimator

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ExecutionOperator

copy, createLoadProfileEstimator, createOutputChannelInstances, getLimitBaseKey, getLoadProfileEstimatorConfigurationKeys, getOriginal, getOutputChannelDescriptor, isFiltered

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

addBroadcastInput, addTargetPlatform, broadcastTo, broadcastTo, collectMappedInputSlots, collectMappedOutputSlots, connectTo, connectTo, getAllInputs, getAllOutputs, getCardinalityPusher, getContainer, getEffectiveOccupant, getEffectiveOccupant, getEpoch, getEstimationContextProperties, getForwards, getInnermostLoop, getInput, getInput, getLoopStack, getName, getNumBroadcastInputs, getNumInputs, getNumOutputs, getNumRegularInputs, getOuterInputSlot, getOutermostInputSlot, getOutermostOutputSlots, getOutput, getOutput, getParent, getTargetPlatforms, isAlternative, isConversion, isElementary, isExecutionOperator, isFeedbackInput, isFeedforwardOutput, isLoopHead, isLoopSubplan, isOwnerOf, isReading, isSink, isSource, isSubplan, isSupportingBroadcastInputs, isUnconnected, propagateInputCardinality, propagateOutputCardinality, propagateOutputCardinality, replaceWith, setContainer, setEpoch, setInput, setName, setOutput

Methods inherited from interface org.apache.wayang.spark.operators.SparkExecutionOperator

getPlatform, name, name

Constructor Details

SparkCountOperator

public SparkCountOperator(DataSetType<Type> type)

Creates a new instance.

Parameters:

type - type of the dataset elements

SparkCountOperator

public SparkCountOperator(CountOperator<Type> that)

Copies an instance (exclusive of broadcasts).

Parameters:

that - that should be copied

Method Details

evaluate

public Tuple<Collection<ExecutionLineageNode>,Collection<ChannelInstance>> evaluate(ChannelInstance[] inputs,
 ChannelInstance[] outputs,
 SparkExecutor sparkExecutor,
 OptimizationContext.OperatorContext operatorContext)

Description copied from interface: SparkExecutionOperator

Evaluates this operator. Takes a set of ChannelInstances according to the operator inputs and manipulates a set of ChannelInstances according to the operator outputs -- unless the operator is a sink, then it triggers execution.

In addition, this method should give feedback of what this instance was doing by wiring the LazyExecutionLineageNodes of input and ouput ChannelInstances and providing a Collection of executed ExecutionLineageNodes.

Specified by:

evaluate in interface SparkExecutionOperator

Parameters:

inputs - ChannelInstances that satisfy the inputs of this operator

outputs - ChannelInstances that accept the outputs of this operator

sparkExecutor - SparkExecutor that executes this instance

operatorContext - optimization information for this instance

Returns:

Collections of what has been executed and produced

createCopy

protected ExecutionOperator createCopy()

Overrides:

createCopy in class OperatorBase

getLoadProfileEstimatorConfigurationKey

public String getLoadProfileEstimatorConfigurationKey()

Specified by:

getLoadProfileEstimatorConfigurationKey in interface ExecutionOperator

getSupportedInputChannels

public List<ChannelDescriptor> getSupportedInputChannels(int index)

Description copied from interface: ExecutionOperator

Display the supported Channels for a certain InputSlot.

Specified by:

getSupportedInputChannels in interface ExecutionOperator

Parameters:

index - the index of the InputSlot

Returns:

an List of Channels' Classes, ordered by their preference of use

getSupportedOutputChannels

public List<ChannelDescriptor> getSupportedOutputChannels(int index)

Description copied from interface: ExecutionOperator

Display the supported Channels for a certain OutputSlot.

Specified by:

getSupportedOutputChannels in interface ExecutionOperator

Parameters:

index - the index of the OutputSlot

Returns:

an List of Channels' Classes, ordered by their preference of use

See Also:

• ExecutionOperator.getOutputChannelDescriptor(int)

containsAction

public boolean containsAction()

Description copied from interface: SparkExecutionOperator

Tell whether this instances is a Spark action. This is important to keep track on when Spark is actually initialized.

Specified by:

containsAction in interface SparkExecutionOperator

Returns:

whether this instance issues Spark actions