| /* |
| * 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.drill.yarn.appMaster; |
| |
| public class BatchScheduler extends AbstractScheduler { |
| private int quantity; |
| private int completedCount; |
| |
| public BatchScheduler(String name, int quantity) { |
| super("batch", name); |
| this.quantity = quantity; |
| } |
| |
| @Override |
| public void completed(Task task) { |
| completedCount++; |
| if (task.getDisposition() != Task.Disposition.COMPLETED) { |
| failCount++; |
| } |
| } |
| |
| @Override |
| public int resize(int level) { |
| quantity = level; |
| return quantity; |
| } |
| |
| @Override |
| public int getTarget() { return quantity; } |
| |
| @Override |
| public int[] getProgress() { |
| return new int[] { Math.min(completedCount, quantity), quantity }; |
| } |
| |
| @Override |
| public void adjust() { |
| int activeCount = state.getTaskCount(); |
| int delta = quantity - activeCount - completedCount; |
| if (delta < 0) { |
| addTasks(-delta); |
| } |
| if (delta > 0) { |
| cancelTasks(delta); |
| } |
| } |
| |
| /** |
| * Cancel any starting tasks. We don't cancel launched, in-flight tasks |
| * because there is no way to tell YARN to cancel tasks that are in the |
| * process of being launched: we have to wait for them to start |
| * before canceling. |
| * |
| * @param n |
| */ |
| |
| private void cancelTasks(int n) { |
| for (Task task : state.getStartingTasks()) { |
| state.cancel(task); |
| if (--n == 0) { |
| break; |
| } |
| } |
| } |
| |
| @Override |
| public boolean hasMoreTasks() { |
| return completedCount < quantity; |
| } |
| |
| @Override |
| public void requestTimedOut() { |
| // Not clear what to do here. Since this case is used only for testing, |
| // deal with this case later. |
| } |
| } |