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    
020    package org.apache.hadoop.hdfs.server.datanode;
021    
022    import java.io.IOException;
023    
024    import 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     */
030    public class ReplicaNotFoundException extends IOException {
031      private static final long serialVersionUID = 1L;
032      public final static String NON_RBW_REPLICA = "Cannot recover a non-RBW replica ";
033      public final static String UNFINALIZED_REPLICA = 
034        "Cannot append to an unfinalized replica ";
035      public final static String UNFINALIZED_AND_NONRBW_REPLICA = 
036        "Cannot recover append/close to a replica that's not FINALIZED and not RBW ";
037      public final static String NON_EXISTENT_REPLICA =
038        "Cannot append to a non-existent replica ";
039      public 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      public ReplicaNotFoundException(ExtendedBlock b) {
047        super("Replica not found for " + b);
048      }
049      
050      public ReplicaNotFoundException(String msg) {
051        super(msg);
052      }
053    }