hadoop ReplicaNotFoundException 源码
haddop ReplicaNotFoundException 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/datanode/ReplicaNotFoundException.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.datanode;
import java.io.IOException;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
/**
* Exception indicating that DataNode does not have a replica
* that matches the target block.
*/
public class ReplicaNotFoundException extends IOException {
private static final long serialVersionUID = 1L;
public final static String NON_RBW_REPLICA =
"Cannot recover a non-RBW replica ";
public final static String UNFINALIZED_REPLICA =
"Cannot append to an unfinalized replica ";
public final static String UNFINALIZED_AND_NONRBW_REPLICA =
"Cannot recover append/close to a replica that's not FINALIZED and not RBW"
+ " ";
public final static String NON_EXISTENT_REPLICA =
"Replica does not exist ";
public final static String UNEXPECTED_GS_REPLICA =
"Cannot append to a replica with unexpected generation stamp ";
public final static String POSSIBLE_ROOT_CAUSE_MSG =
". The block may have been removed recently by the balancer " +
"or by intentionally reducing the replication factor. " +
"This condition is usually harmless. To be certain, please check the " +
"preceding datanode log messages for signs of a more serious issue.";
public ReplicaNotFoundException() {
super();
}
public ReplicaNotFoundException(ExtendedBlock b) {
super("Replica not found for " + b + POSSIBLE_ROOT_CAUSE_MSG);
}
public ReplicaNotFoundException(String msg) {
super(msg);
}
}
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