| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.beam.runners.dataflow.worker.graph; |
| |
| import static org.apache.beam.runners.dataflow.util.Structs.addString; |
| |
| import com.google.api.services.dataflow.model.ParDoInstruction; |
| import com.google.api.services.dataflow.model.ParallelInstruction; |
| import com.google.api.services.dataflow.model.PartialGroupByKeyInstruction; |
| import java.util.Map; |
| import java.util.function.Function; |
| import org.apache.beam.runners.dataflow.worker.CombinePhase; |
| import org.apache.beam.runners.dataflow.worker.graph.Edges.Edge; |
| import org.apache.beam.runners.dataflow.worker.graph.Nodes.ExecutionLocation; |
| import org.apache.beam.runners.dataflow.worker.graph.Nodes.Node; |
| import org.apache.beam.runners.dataflow.worker.graph.Nodes.ParallelInstructionNode; |
| import org.apache.beam.runners.dataflow.worker.util.WorkerPropertyNames; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.graph.MutableNetwork; |
| |
| /** |
| * A function that replaces PartialGroupByKey nodes with ParDo nodes that can be translated by the |
| * {@link RegisterNodeFunction} into a Pre-combine executed by the SDK harness. |
| */ |
| public class ReplacePgbkWithPrecombineFunction |
| implements Function<MutableNetwork<Node, Edge>, MutableNetwork<Node, Edge>> { |
| |
| @Override |
| public MutableNetwork<Node, Edge> apply(MutableNetwork<Node, Edge> network) { |
| Networks.replaceDirectedNetworkNodes( |
| network, |
| (Node node) -> { |
| if (!isPrecombinePgbk(node)) { |
| return node; |
| } |
| |
| // Turn the Pgbk into a ParDo with the combine function as a UserFn. |
| ParallelInstructionNode castNode = ((ParallelInstructionNode) node); |
| ParallelInstruction parallelInstruction = castNode.getParallelInstruction(); |
| Map<String, Object> cloudUserFnSpec = |
| parallelInstruction.getPartialGroupByKey().getValueCombiningFn(); |
| addString(cloudUserFnSpec, WorkerPropertyNames.PHASE, CombinePhase.ADD); |
| |
| ParDoInstruction newParDoInstruction = new ParDoInstruction(); |
| newParDoInstruction.setUserFn(cloudUserFnSpec); |
| |
| ParallelInstruction newParallelInstruction = parallelInstruction.clone(); |
| newParallelInstruction.setPartialGroupByKey(null); |
| newParallelInstruction.setParDo(newParDoInstruction); |
| |
| return ParallelInstructionNode.create(newParallelInstruction, ExecutionLocation.UNKNOWN); |
| }); |
| |
| return network; |
| } |
| |
| /** |
| * Returns true iff the {@link Node} is a {@link ParallelInstructionNode} with a {@link |
| * PartialGroupByKeyInstruction} that contains a serialized combining function. |
| */ |
| private boolean isPrecombinePgbk(Node node) { |
| return node instanceof ParallelInstructionNode |
| && ((ParallelInstructionNode) node).getParallelInstruction().getPartialGroupByKey() != null |
| && ((ParallelInstructionNode) node) |
| .getParallelInstruction() |
| .getPartialGroupByKey() |
| .getValueCombiningFn() |
| != null; |
| } |
| } |