001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.checkpoint;
020
021import org.apache.hadoop.io.Writable;
022
023/**
024 * This class represent an identifier of a checkpoint.
025 * The identifier must provide sufficient information to the corresponding CheckpointService to locate and retrieve the
026 * data contained in the checkpoint. The identifier can also contain small amount of metadata about a checkpoint.
027 */
028public interface CheckpointID extends Writable {
029
030}