| /** |
| * 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.hadoop.mapreduce.v2.app.speculate; |
| |
| import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent.TaskAttemptStatus; |
| import org.apache.hadoop.yarn.event.EventHandler; |
| |
| /** |
| * Speculator component. Task Attempts' status updates are sent to this |
| * component. Concrete implementation runs the speculative algorithm and |
| * sends the TaskEventType.T_ADD_ATTEMPT. |
| * |
| * An implementation also has to arrange for the jobs to be scanned from |
| * time to time, to launch the speculations. |
| */ |
| public interface Speculator |
| extends EventHandler<SpeculatorEvent> { |
| |
| enum EventType { |
| ATTEMPT_STATUS_UPDATE, |
| ATTEMPT_START, |
| TASK_CONTAINER_NEED_UPDATE, |
| JOB_CREATE |
| } |
| |
| // This will be implemented if we go to a model where the events are |
| // processed within the TaskAttempts' state transitions' code. |
| public void handleAttempt(TaskAttemptStatus status); |
| } |
