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DefaultCheckpointSupportedChecker xref
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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  }