hadoop AddBlockPoolException 源码
haddop AddBlockPoolException 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/AddBlockPoolException.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.fsdataset.impl;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
/**
* This exception collects all IOExceptions thrown when adding block pools and
* scanning volumes. It keeps the information about which volume is associated
* with an exception.
*
*/
public class AddBlockPoolException extends RuntimeException {
private Map<FsVolumeSpi, IOException> unhealthyDataDirs;
public AddBlockPoolException(Map<FsVolumeSpi, IOException>
unhealthyDataDirs) {
this.unhealthyDataDirs = unhealthyDataDirs;
}
public AddBlockPoolException() {
this.unhealthyDataDirs = new ConcurrentHashMap<FsVolumeSpi, IOException>();
}
public void mergeException(AddBlockPoolException e) {
if (e == null) {
return;
}
for(FsVolumeSpi v : e.unhealthyDataDirs.keySet()) {
// If there is already an exception for this volume, keep the original
// exception and discard the new one. It is likely the first
// exception caused the second or they were both due to the disk issue
if (!unhealthyDataDirs.containsKey(v)) {
unhealthyDataDirs.put(v, e.unhealthyDataDirs.get(v));
}
}
}
public boolean hasExceptions() {
return !unhealthyDataDirs.isEmpty();
}
public Map<FsVolumeSpi, IOException> getFailingVolumes() {
return unhealthyDataDirs;
}
@Override
public String toString() {
return getClass().getName() + ": " + unhealthyDataDirs.toString();
}
}
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