1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.giraph.bsp.checkpoints; 19 20 import org.apache.giraph.conf.GiraphConfiguration; 21 import org.apache.giraph.master.MasterCompute; 22 23 /** 24 * Default checkpoint supported checker. 25 * Most tasks will support checkpointing by default unless they do output 26 * during the computation. Some tasks however can use non-checkpointable 27 * features, e.g.: static variables to pass data around between supersteps 28 * or new threads started from MasterCompute or external resources. In that 29 * case to prevent accidental checkpointing you should provide checker 30 * implementation. 31 */ 32 public class DefaultCheckpointSupportedChecker 33 implements CheckpointSupportedChecker { 34 @Override 35 public boolean isCheckpointSupported(GiraphConfiguration conf, 36 MasterCompute masterCompute) { 37 return !conf.doOutputDuringComputation(); 38 } 39 }