org.apache.flink.api.java.record.operators

Class DeltaIteration

java.lang.Object

org.apache.flink.api.common.operators.Operator<OUT>

org.apache.flink.api.common.operators.AbstractUdfOperator<OUT,FT>

org.apache.flink.api.common.operators.DualInputOperator<ST,WT,ST,org.apache.flink.api.common.functions.AbstractRichFunction>

org.apache.flink.api.common.operators.base.DeltaIterationBase<org.apache.flink.types.Record,org.apache.flink.types.Record>

org.apache.flink.api.java.record.operators.DeltaIteration

All Implemented Interfaces:

org.apache.flink.api.common.operators.IterationOperator, org.apache.flink.util.Visitable<org.apache.flink.api.common.operators.Operator<?>>

Deprecated.

@Deprecated
public class DeltaIteration
extends org.apache.flink.api.common.operators.base.DeltaIterationBase<org.apache.flink.types.Record,org.apache.flink.types.Record>

NOTE: The Record API is marked as deprecated. It is not being developed anymore and will be removed from the code at some point. See FLINK-1106 for more details. A DeltaIteration is similar to a BulkIteration, but maintains state across the individual iteration steps. The state is called the solution set, can be obtained via DeltaIterationBase.getSolutionSet(), and be accessed by joining (or CoGrouping) with it. The solution set is updated by producing a delta for it, which is merged into the solution set at the end of each iteration step.

The delta iteration must be closed by setting a delta for the solution set (DeltaIterationBase.setSolutionSetDelta(org.apache.flink.api.common.operators.Operator)) and the new workset (the data set that will be fed back, DeltaIterationBase.setNextWorkset(org.apache.flink.api.common.operators.Operator)). The DeltaIteration itself represents the result after the iteration has terminated. Delta iterations terminate when the feed back data set (the workset) is empty. In addition, a maximum number of steps is given as a fall back termination guard.

Elements in the solution set are uniquely identified by a key. When merging the solution set delta, contained elements with the same key are replaced.

This class is a subclass of DualInputOperator. The solution set is considered the first input, the workset is considered the second input.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DeltaIteration.SolutionSetPlaceHolder Deprecated. Specialized operator to use as a recognizable place-holder for the solution set input to the step function.
static class	DeltaIteration.WorksetPlaceHolder Deprecated. Specialized operator to use as a recognizable place-holder for the working set input to the step function.

Field Summary

Fields inherited from class org.apache.flink.api.common.operators.DualInputOperator

input1, input2

Fields inherited from class org.apache.flink.api.common.operators.AbstractUdfOperator

broadcastInputs, userFunction

Fields inherited from class org.apache.flink.api.common.operators.Operator

compilerHints, name, operatorInfo, parameters

Constructor Summary

Constructors

Constructor and Description
DeltaIteration(int keyPosition) Deprecated.
DeltaIteration(int[] keyPositions) Deprecated.
DeltaIteration(int[] keyPositions, String name) Deprecated.
DeltaIteration(int keyPosition, String name) Deprecated.

Method Summary

Methods inherited from class org.apache.flink.api.common.operators.base.DeltaIterationBase

executeOnCollections, getAggregators, getBroadcastInputs, getInitialSolutionSet, getInitialWorkset, getMaximumNumberOfIterations, getNextWorkset, getSolutionSet, getSolutionSetDelta, getSolutionSetKeyFields, getWorkset, isSolutionSetUnManaged, setBroadcastVariable, setBroadcastVariables, setInitialSolutionSet, setInitialWorkset, setMaximumNumberOfIterations, setNextWorkset, setSolutionSetDelta, setSolutionSetUnManaged

Methods inherited from class org.apache.flink.api.common.operators.DualInputOperator

accept, addFirstInput, addFirstInputs, addSecondInput, addSecondInputs, clearFirstInput, clearSecondInput, getFirstInput, getKeyColumns, getNumberOfInputs, getOperatorInfo, getSecondInput, getSemanticProperties, setFirstInput, setFirstInput, setFirstInputs, setSecondInput, setSecondInput, setSecondInputs, setSemanticProperties

Methods inherited from class org.apache.flink.api.common.operators.AbstractUdfOperator

asArray, emptyClassArray, getUserCodeWrapper

Methods inherited from class org.apache.flink.api.common.operators.Operator

createUnionCascade, createUnionCascade, createUnionCascade, getCompilerHints, getDegreeOfParallelism, getName, getParallelism, getParameters, setDegreeOfParallelism, setName, setParallelism, setParameter, setParameter, setParameter, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DeltaIteration

public DeltaIteration(int keyPosition)

Deprecated.

DeltaIteration

public DeltaIteration(int[] keyPositions)

Deprecated.

DeltaIteration

public DeltaIteration(int keyPosition,
                      String name)

Deprecated.

DeltaIteration

public DeltaIteration(int[] keyPositions,
                      String name)

Deprecated.