hadoop CorruptFileBlockIterator 源码
haddop CorruptFileBlockIterator 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/CorruptFileBlockIterator.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.client.impl;
import java.io.IOException;
import java.util.NoSuchElementException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
/**
* Provides an iterator interface for listCorruptFileBlocks.
* This class is used by DistributedFileSystem and Hdfs.
*/
@InterfaceAudience.Private
public class CorruptFileBlockIterator implements RemoteIterator<Path> {
private final DFSClient dfs;
private final String path;
private String[] files = null;
private int fileIdx = 0;
private String cookie = null;
private Path nextPath = null;
private int callsMade = 0;
public CorruptFileBlockIterator(DFSClient dfs, Path path) throws IOException {
this.dfs = dfs;
this.path = path2String(path);
loadNext();
}
/**
* @return the number of calls made to the DFSClient.
* This is for debugging and testing purposes.
*/
public int getCallsMade() {
return callsMade;
}
private String path2String(Path path) {
return path.toUri().getPath();
}
private Path string2Path(String string) {
return new Path(string);
}
private void loadNext() throws IOException {
if (files == null || fileIdx >= files.length) {
CorruptFileBlocks cfb = dfs.listCorruptFileBlocks(path, cookie);
files = cfb.getFiles();
cookie = cfb.getCookie();
fileIdx = 0;
callsMade++;
}
if (fileIdx >= files.length) {
// received an empty response
// there are no more corrupt file blocks
nextPath = null;
} else {
nextPath = string2Path(files[fileIdx]);
fileIdx++;
}
}
@Override
public boolean hasNext() {
return nextPath != null;
}
@Override
public Path next() throws IOException {
if (!hasNext()) {
throw new NoSuchElementException("No more corrupt file blocks");
}
Path result = nextPath;
loadNext();
return result;
}
}
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