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
019
020package org.apache.hadoop.hdfs.server.datanode;
021
022import java.io.IOException;
023
024import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
025
026/**
027 * Exception indicating that DataNode does not have a replica
028 * that matches the target block.  
029 */
030public class ReplicaNotFoundException extends IOException {
031  private static final long serialVersionUID = 1L;
032  final static String NON_RBW_REPLICA = "Cannot recover a non-RBW replica ";
033  final static String UNFINALIZED_REPLICA = 
034    "Cannot append to an unfinalized replica ";
035  final static String UNFINALIZED_AND_NONRBW_REPLICA = 
036    "Cannot recover append/close to a replica that's not FINALIZED and not RBW ";
037  final static String NON_EXISTENT_REPLICA =
038    "Cannot append to a non-existent replica ";
039  final static String UNEXPECTED_GS_REPLICA =
040    "Cannot append to a replica with unexpeted generation stamp ";
041
042  public ReplicaNotFoundException() {
043    super();
044  }
045
046  ReplicaNotFoundException(ExtendedBlock b) {
047    super("Replica not found for " + b);
048  }
049  
050  public ReplicaNotFoundException(String msg) {
051    super(msg);
052  }
053}