Java Code Examples for org.apache.flink.runtime.operators.shipping.ShipStrategyType#PARTITION_RANDOM

The following examples show how to use org.apache.flink.runtime.operators.shipping.ShipStrategyType#PARTITION_RANDOM . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: GlobalProperties.java From Flink-CEPplus with Apache License 2.0

4 votes

public void parameterizeChannel(Channel channel, boolean globalDopChange,
								ExecutionMode exchangeMode, boolean breakPipeline) {

	ShipStrategyType shipType;
	FieldList partitionKeys;
	boolean[] sortDirection;
	Partitioner<?> partitioner;

	switch (this.partitioning) {
		case RANDOM_PARTITIONED:
			shipType = globalDopChange ? ShipStrategyType.PARTITION_RANDOM : ShipStrategyType.FORWARD;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case FULL_REPLICATION:
			shipType = ShipStrategyType.BROADCAST;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case ANY_PARTITIONING:
		case HASH_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_HASH;
			partitionKeys = Utils.createOrderedFromSet(this.partitioningFields);
			sortDirection = null;
			partitioner = null;
			break;

		case RANGE_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_RANGE;
			partitionKeys = this.ordering.getInvolvedIndexes();
			sortDirection = this.ordering.getFieldSortDirections();
			partitioner = null;
			break;

		case FORCED_REBALANCED:
			shipType = ShipStrategyType.PARTITION_RANDOM;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case CUSTOM_PARTITIONING:
			shipType = ShipStrategyType.PARTITION_CUSTOM;
			partitionKeys = this.partitioningFields;
			sortDirection = null;
			partitioner = this.customPartitioner;
			break;

		default:
			throw new CompilerException("Unsupported partitioning strategy");
	}

	channel.setDataDistribution(this.distribution);
	DataExchangeMode exMode = DataExchangeMode.select(exchangeMode, shipType, breakPipeline);
	channel.setShipStrategy(shipType, partitionKeys, sortDirection, partitioner, exMode);
}

Example 2

Source File: SingleInputNode.java From Flink-CEPplus with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExchangeMode)
		throws CompilerException
{
	// see if an internal hint dictates the strategy to use
	final Configuration conf = getOperator().getParameters();
	final String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	final ShipStrategyType preSet;
	
	if (shipStrategy != null) {
		if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH)) {
			preSet = ShipStrategyType.PARTITION_HASH;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE)) {
			preSet = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_FORWARD)) {
			preSet = ShipStrategyType.FORWARD;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unrecognized ship strategy hint: " + shipStrategy);
		}
	} else {
		preSet = null;
	}
	
	// get the predecessor node
	Operator<?> children = ((SingleInputOperator<?, ?, ?>) getOperator()).getInput();
	
	OptimizerNode pred;
	DagConnection conn;
	if (children == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input.");
	} else {
		pred = contractToNode.get(children);
		conn = new DagConnection(pred, this, defaultExchangeMode);
		if (preSet != null) {
			conn.setShipStrategy(preSet);
		}
	}
	
	// create the connection and add it
	setIncomingConnection(conn);
	pred.addOutgoingConnection(conn);
}

Example 3

Source File: TwoInputNode.java From Flink-CEPplus with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExecutionMode) {
	// see if there is a hint that dictates which shipping strategy to use for BOTH inputs
	final Configuration conf = getOperator().getParameters();
	ShipStrategyType preSet1 = null;
	ShipStrategyType preSet2 = null;
	
	String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the FIRST input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_FIRST_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input one: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the SECOND input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_SECOND_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input two: " + shipStrategy);
		}
	}
	
	// get the predecessors
	DualInputOperator<?, ?, ?, ?> contr = getOperator();
	
	Operator<?> leftPred = contr.getFirstInput();
	Operator<?> rightPred = contr.getSecondInput();
	
	OptimizerNode pred1;
	DagConnection conn1;
	if (leftPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for first input.");
	} else {
		pred1 = contractToNode.get(leftPred);
		conn1 = new DagConnection(pred1, this, defaultExecutionMode);
		if (preSet1 != null) {
			conn1.setShipStrategy(preSet1);
		}
	} 
	
	// create the connection and add it
	this.input1 = conn1;
	pred1.addOutgoingConnection(conn1);
	
	OptimizerNode pred2;
	DagConnection conn2;
	if (rightPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for second input.");
	} else {
		pred2 = contractToNode.get(rightPred);
		conn2 = new DagConnection(pred2, this, defaultExecutionMode);
		if (preSet2 != null) {
			conn2.setShipStrategy(preSet2);
		}
	}
	
	// create the connection and add it
	this.input2 = conn2;
	pred2.addOutgoingConnection(conn2);
}

Example 4

Source File: GlobalProperties.java From flink with Apache License 2.0

4 votes

public void parameterizeChannel(Channel channel, boolean globalDopChange,
								ExecutionMode exchangeMode, boolean breakPipeline) {

	ShipStrategyType shipType;
	FieldList partitionKeys;
	boolean[] sortDirection;
	Partitioner<?> partitioner;

	switch (this.partitioning) {
		case RANDOM_PARTITIONED:
			shipType = globalDopChange ? ShipStrategyType.PARTITION_RANDOM : ShipStrategyType.FORWARD;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case FULL_REPLICATION:
			shipType = ShipStrategyType.BROADCAST;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case ANY_PARTITIONING:
		case HASH_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_HASH;
			partitionKeys = Utils.createOrderedFromSet(this.partitioningFields);
			sortDirection = null;
			partitioner = null;
			break;

		case RANGE_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_RANGE;
			partitionKeys = this.ordering.getInvolvedIndexes();
			sortDirection = this.ordering.getFieldSortDirections();
			partitioner = null;
			break;

		case FORCED_REBALANCED:
			shipType = ShipStrategyType.PARTITION_RANDOM;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case CUSTOM_PARTITIONING:
			shipType = ShipStrategyType.PARTITION_CUSTOM;
			partitionKeys = this.partitioningFields;
			sortDirection = null;
			partitioner = this.customPartitioner;
			break;

		default:
			throw new CompilerException("Unsupported partitioning strategy");
	}

	channel.setDataDistribution(this.distribution);
	DataExchangeMode exMode = DataExchangeMode.select(exchangeMode, shipType, breakPipeline);
	channel.setShipStrategy(shipType, partitionKeys, sortDirection, partitioner, exMode);
}

Example 5

Source File: SingleInputNode.java From flink with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExchangeMode)
		throws CompilerException
{
	// see if an internal hint dictates the strategy to use
	final Configuration conf = getOperator().getParameters();
	final String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	final ShipStrategyType preSet;
	
	if (shipStrategy != null) {
		if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH)) {
			preSet = ShipStrategyType.PARTITION_HASH;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE)) {
			preSet = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_FORWARD)) {
			preSet = ShipStrategyType.FORWARD;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unrecognized ship strategy hint: " + shipStrategy);
		}
	} else {
		preSet = null;
	}
	
	// get the predecessor node
	Operator<?> children = ((SingleInputOperator<?, ?, ?>) getOperator()).getInput();
	
	OptimizerNode pred;
	DagConnection conn;
	if (children == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input.");
	} else {
		pred = contractToNode.get(children);
		conn = new DagConnection(pred, this, defaultExchangeMode);
		if (preSet != null) {
			conn.setShipStrategy(preSet);
		}
	}
	
	// create the connection and add it
	setIncomingConnection(conn);
	pred.addOutgoingConnection(conn);
}

Example 6

Source File: TwoInputNode.java From flink with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExecutionMode) {
	// see if there is a hint that dictates which shipping strategy to use for BOTH inputs
	final Configuration conf = getOperator().getParameters();
	ShipStrategyType preSet1 = null;
	ShipStrategyType preSet2 = null;
	
	String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the FIRST input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_FIRST_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input one: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the SECOND input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_SECOND_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input two: " + shipStrategy);
		}
	}
	
	// get the predecessors
	DualInputOperator<?, ?, ?, ?> contr = getOperator();
	
	Operator<?> leftPred = contr.getFirstInput();
	Operator<?> rightPred = contr.getSecondInput();
	
	OptimizerNode pred1;
	DagConnection conn1;
	if (leftPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for first input.");
	} else {
		pred1 = contractToNode.get(leftPred);
		conn1 = new DagConnection(pred1, this, defaultExecutionMode);
		if (preSet1 != null) {
			conn1.setShipStrategy(preSet1);
		}
	} 
	
	// create the connection and add it
	this.input1 = conn1;
	pred1.addOutgoingConnection(conn1);
	
	OptimizerNode pred2;
	DagConnection conn2;
	if (rightPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for second input.");
	} else {
		pred2 = contractToNode.get(rightPred);
		conn2 = new DagConnection(pred2, this, defaultExecutionMode);
		if (preSet2 != null) {
			conn2.setShipStrategy(preSet2);
		}
	}
	
	// create the connection and add it
	this.input2 = conn2;
	pred2.addOutgoingConnection(conn2);
}

Example 7

Source File: GlobalProperties.java From flink with Apache License 2.0

4 votes

public void parameterizeChannel(Channel channel, boolean globalDopChange,
								ExecutionMode exchangeMode, boolean breakPipeline) {

	ShipStrategyType shipType;
	FieldList partitionKeys;
	boolean[] sortDirection;
	Partitioner<?> partitioner;

	switch (this.partitioning) {
		case RANDOM_PARTITIONED:
			shipType = globalDopChange ? ShipStrategyType.PARTITION_RANDOM : ShipStrategyType.FORWARD;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case FULL_REPLICATION:
			shipType = ShipStrategyType.BROADCAST;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case ANY_PARTITIONING:
		case HASH_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_HASH;
			partitionKeys = Utils.createOrderedFromSet(this.partitioningFields);
			sortDirection = null;
			partitioner = null;
			break;

		case RANGE_PARTITIONED:
			shipType = ShipStrategyType.PARTITION_RANGE;
			partitionKeys = this.ordering.getInvolvedIndexes();
			sortDirection = this.ordering.getFieldSortDirections();
			partitioner = null;
			break;

		case FORCED_REBALANCED:
			shipType = ShipStrategyType.PARTITION_RANDOM;
			partitionKeys = null;
			sortDirection = null;
			partitioner = null;
			break;

		case CUSTOM_PARTITIONING:
			shipType = ShipStrategyType.PARTITION_CUSTOM;
			partitionKeys = this.partitioningFields;
			sortDirection = null;
			partitioner = this.customPartitioner;
			break;

		default:
			throw new CompilerException("Unsupported partitioning strategy");
	}

	channel.setDataDistribution(this.distribution);
	DataExchangeMode exMode = DataExchangeMode.select(exchangeMode, shipType, breakPipeline);
	channel.setShipStrategy(shipType, partitionKeys, sortDirection, partitioner, exMode);
}

Example 8

Source File: SingleInputNode.java From flink with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExchangeMode)
		throws CompilerException
{
	// see if an internal hint dictates the strategy to use
	final Configuration conf = getOperator().getParameters();
	final String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	final ShipStrategyType preSet;
	
	if (shipStrategy != null) {
		if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH)) {
			preSet = ShipStrategyType.PARTITION_HASH;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE)) {
			preSet = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_FORWARD)) {
			preSet = ShipStrategyType.FORWARD;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unrecognized ship strategy hint: " + shipStrategy);
		}
	} else {
		preSet = null;
	}
	
	// get the predecessor node
	Operator<?> children = ((SingleInputOperator<?, ?, ?>) getOperator()).getInput();
	
	OptimizerNode pred;
	DagConnection conn;
	if (children == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input.");
	} else {
		pred = contractToNode.get(children);
		conn = new DagConnection(pred, this, defaultExchangeMode);
		if (preSet != null) {
			conn.setShipStrategy(preSet);
		}
	}
	
	// create the connection and add it
	setIncomingConnection(conn);
	pred.addOutgoingConnection(conn);
}

Example 9

Source File: TwoInputNode.java From flink with Apache License 2.0

4 votes

@Override
public void setInput(Map<Operator<?>, OptimizerNode> contractToNode, ExecutionMode defaultExecutionMode) {
	// see if there is a hint that dictates which shipping strategy to use for BOTH inputs
	final Configuration conf = getOperator().getParameters();
	ShipStrategyType preSet1 = null;
	ShipStrategyType preSet2 = null;
	
	String shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the FIRST input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_FIRST_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet1 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet1 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input one: " + shipStrategy);
		}
	}

	// see if there is a hint that dictates which shipping strategy to use for the SECOND input
	shipStrategy = conf.getString(Optimizer.HINT_SHIP_STRATEGY_SECOND_INPUT, null);
	if (shipStrategy != null) {
		if (Optimizer.HINT_SHIP_STRATEGY_FORWARD.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.FORWARD;
		} else if (Optimizer.HINT_SHIP_STRATEGY_BROADCAST.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.BROADCAST;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_HASH.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_HASH;
		} else if (Optimizer.HINT_SHIP_STRATEGY_REPARTITION_RANGE.equals(shipStrategy)) {
			preSet2 = ShipStrategyType.PARTITION_RANGE;
		} else if (shipStrategy.equalsIgnoreCase(Optimizer.HINT_SHIP_STRATEGY_REPARTITION)) {
			preSet2 = ShipStrategyType.PARTITION_RANDOM;
		} else {
			throw new CompilerException("Unknown hint for shipping strategy of input two: " + shipStrategy);
		}
	}
	
	// get the predecessors
	DualInputOperator<?, ?, ?, ?> contr = getOperator();
	
	Operator<?> leftPred = contr.getFirstInput();
	Operator<?> rightPred = contr.getSecondInput();
	
	OptimizerNode pred1;
	DagConnection conn1;
	if (leftPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for first input.");
	} else {
		pred1 = contractToNode.get(leftPred);
		conn1 = new DagConnection(pred1, this, defaultExecutionMode);
		if (preSet1 != null) {
			conn1.setShipStrategy(preSet1);
		}
	} 
	
	// create the connection and add it
	this.input1 = conn1;
	pred1.addOutgoingConnection(conn1);
	
	OptimizerNode pred2;
	DagConnection conn2;
	if (rightPred == null) {
		throw new CompilerException("Error: Node for '" + getOperator().getName() + "' has no input set for second input.");
	} else {
		pred2 = contractToNode.get(rightPred);
		conn2 = new DagConnection(pred2, this, defaultExecutionMode);
		if (preSet2 != null) {
			conn2.setShipStrategy(preSet2);
		}
	}
	
	// create the connection and add it
	this.input2 = conn2;
	pred2.addOutgoingConnection(conn2);
}