@Override
public SingleInputPlanNode instantiate(Channel in, SingleInputNode node) {
if (in.getShipStrategy() == ShipStrategyType.FORWARD) {
// locally connected, directly instantiate
return new SingleInputPlanNode(
node, "Reduce (" + node.getPactContract().getName() + ")", in, DriverStrategy.ALL_REDUCE);
} else {
// non forward case.plug in a combiner
Channel toCombiner = new Channel(in.getSource());
toCombiner.setShipStrategy(ShipStrategyType.FORWARD);
// create an input node for combine with same DOP as input node
ReduceNode combinerNode = ((ReduceNode) node).getCombinerUtilityNode();
combinerNode.setDegreeOfParallelism(in.getSource().getDegreeOfParallelism());
combinerNode.setSubtasksPerInstance(in.getSource().getSubtasksPerInstance());
SingleInputPlanNode combiner =
new SingleInputPlanNode(
combinerNode,
"Combine (" + node.getPactContract().getName() + ")",
toCombiner,
DriverStrategy.ALL_REDUCE);
combiner.setCosts(new Costs(0, 0));
combiner.initProperties(toCombiner.getGlobalProperties(), toCombiner.getLocalProperties());
Channel toReducer = new Channel(combiner);
toReducer.setShipStrategy(
in.getShipStrategy(), in.getShipStrategyKeys(), in.getShipStrategySortOrder());
toReducer.setLocalStrategy(
in.getLocalStrategy(), in.getLocalStrategyKeys(), in.getLocalStrategySortOrder());
return new SingleInputPlanNode(
node,
"Reduce(" + node.getPactContract().getName() + ")",
toReducer,
DriverStrategy.ALL_REDUCE);
}
}
@Override
public SingleInputPlanNode instantiate(Channel in, SingleInputNode node) {
return new SingleInputPlanNode(
node, "Map (" + node.getPactContract().getName() + ")", in, DriverStrategy.COLLECTOR_MAP);
}