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, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.util; 020 021import org.apache.hadoop.classification.InterfaceAudience; 022import org.apache.hadoop.classification.InterfaceStability; 023 024/** 025 * A facility for reporting progress. 026 * 027 * <p>Clients and/or applications can use the provided <code>Progressable</code> 028 * to explicitly report progress to the Hadoop framework. This is especially 029 * important for operations which take significant amount of time since, 030 * in-lieu of the reported progress, the framework has to assume that an error 031 * has occured and time-out the operation.</p> 032 */ 033@InterfaceAudience.Public 034@InterfaceStability.Stable 035public interface Progressable { 036 /** 037 * Report progress to the Hadoop framework. 038 */ 039 public void progress(); 040}