/**
* 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;
import static org.junit.Assert.fail;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.zip.CRC32;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import java.util.HashSet;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.raid.Codec;
public abstract class RaidDFSUtil {
public static final String[] codes = new String[] {"xor", "rs"};
final static Log LOG = LogFactory.getLog(
"org.apache.hadoop.raid.RaidDFSUtil");
/**
* Returns the corrupt blocks in a file.
*/
public static List<LocatedBlock> corruptBlocksInFile(
DistributedFileSystem dfs, String path, long offset, long length)
throws IOException {
List<LocatedBlock> corrupt = new LinkedList<LocatedBlock>();
LocatedBlocks locatedBlocks =
getBlockLocations(dfs, path, offset, length);
for (LocatedBlock b: locatedBlocks.getLocatedBlocks()) {
if (b.isCorrupt() ||
(b.getLocations().length == 0 && b.getBlockSize() > 0)) {
corrupt.add(b);
}
}
return corrupt;
}
public static LocatedBlocks getBlockLocations(
DistributedFileSystem dfs, String path, long offset, long length)
throws IOException {
return dfs.getClient().namenode.getBlockLocations(path, offset, length);
}
public static long getCRC(FileSystem fs, Path p) throws IOException {
CRC32 crc = new CRC32();
FSDataInputStream stm = fs.open(p);
int b;
while ((b = stm.read())>=0) {
crc.update(b);
}
stm.close();
return crc.getValue();
}
public static void cleanUp(FileSystem fileSys, Path dir) throws IOException {
if (fileSys.exists(dir)) {
fileSys.delete(dir, true);
}
}
public static void reportCorruptBlocks(FileSystem fs, Path file, int[] idxs,
long blockSize) throws IOException {
FSDataInputStream in = fs.open(file);
try {
for (int idx: idxs) {
long offset = idx * blockSize;
LOG.info("Reporting corrupt block " + file + ":" + offset);
in.seek(offset);
try {
in.readFully(new byte[(int)blockSize]);
fail("Expected exception not thrown for " + file + ":" + offset);
} catch (org.apache.hadoop.fs.ChecksumException e) {
} catch (org.apache.hadoop.fs.BlockMissingException bme) {
}
}
} finally {
in.close();
}
}
}