| /** |
| * 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.tez.dag.app.dag.impl; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.tez.dag.api.EdgeManagerPlugin; |
| import org.apache.tez.dag.api.EdgeManagerPluginContext; |
| import org.apache.tez.runtime.api.events.DataMovementEvent; |
| import org.apache.tez.runtime.api.events.InputReadErrorEvent; |
| |
| import org.apache.tez.common.Preconditions; |
| |
| public class OneToOneEdgeManager extends EdgeManagerPlugin { |
| |
| final List<Integer> destinationInputIndices = |
| Collections.unmodifiableList(Collections.singletonList(0)); |
| final AtomicBoolean stateChecked = new AtomicBoolean(false); |
| |
| public OneToOneEdgeManager(EdgeManagerPluginContext context) { |
| super(context); |
| } |
| |
| @Override |
| public void initialize() { |
| // Nothing to do. |
| } |
| |
| @Override |
| public int getNumDestinationTaskPhysicalInputs(int destinationTaskIndex) { |
| return 1; |
| } |
| |
| @Override |
| public int getNumSourceTaskPhysicalOutputs(int sourceTaskIndex) { |
| return 1; |
| } |
| |
| @Override |
| public void routeDataMovementEventToDestination(DataMovementEvent event, |
| int sourceTaskIndex, int sourceOutputIndex, |
| Map<Integer, List<Integer>> destinationTaskAndInputIndices) { |
| checkState(); |
| destinationTaskAndInputIndices.put(sourceTaskIndex, destinationInputIndices); |
| } |
| |
| @Override |
| public void routeInputSourceTaskFailedEventToDestination(int sourceTaskIndex, |
| Map<Integer, List<Integer>> destinationTaskAndInputIndices) { |
| destinationTaskAndInputIndices.put(sourceTaskIndex, destinationInputIndices); |
| } |
| |
| @Override |
| public int routeInputErrorEventToSource(InputReadErrorEvent event, |
| int destinationTaskIndex, int destinationFailedInputIndex) { |
| return destinationTaskIndex; |
| } |
| |
| @Override |
| public int getNumDestinationConsumerTasks(int sourceTaskIndex) { |
| return 1; |
| } |
| |
| private void checkState() { |
| if (stateChecked.get()) { |
| return; |
| } |
| // by the time routing is initiated all task counts must be determined and stable |
| Preconditions.checkState(getContext().getSourceVertexNumTasks() == getContext() |
| .getDestinationVertexNumTasks(), "1-1 source and destination task counts must match." |
| + " Destination: " + getContext().getDestinationVertexName() + " tasks: " |
| + getContext().getDestinationVertexNumTasks() + " Source: " |
| + getContext().getSourceVertexName() + " tasks: " + getContext().getSourceVertexNumTasks()); |
| stateChecked.set(true); |
| } |
| } |