Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/**
* 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.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import com.google.common.base.Preconditions;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.DataChecksum;
import org.apache.htrace.shaded.fasterxml.jackson.databind.util.ByteBufferBackedInputStream;
/** Utility methods. */
@InterfaceAudience.Private
public class FsDatasetUtil {
static boolean isUnlinkTmpFile(File f) {
return f.getName().endsWith(DatanodeUtil.UNLINK_BLOCK_SUFFIX);
}
public static byte[] createNullChecksumByteArray() {
DataChecksum csum =
DataChecksum.newDataChecksum(DataChecksum.Type.NULL, 512);
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream dataOut = new DataOutputStream(out);
try {
BlockMetadataHeader.writeHeader(dataOut, csum);
dataOut.close();
} catch (IOException e) {
FsVolumeImpl.LOG.error(
"Exception in creating null checksum stream: " + e);
return null;
}
return out.toByteArray();
}
static File getOrigFile(File unlinkTmpFile) {
final String name = unlinkTmpFile.getName();
if (!name.endsWith(DatanodeUtil.UNLINK_BLOCK_SUFFIX)) {
throw new IllegalArgumentException("unlinkTmpFile=" + unlinkTmpFile
+ " does not end with " + DatanodeUtil.UNLINK_BLOCK_SUFFIX);
}
final int n = name.length() - DatanodeUtil.UNLINK_BLOCK_SUFFIX.length();
return new File(unlinkTmpFile.getParentFile(), name.substring(0, n));
}
static File getMetaFile(File f, long gs) {
return new File(f.getParent(),
DatanodeUtil.getMetaName(f.getName(), gs));
}
/** Find the corresponding meta data file from a given block file */
public static File findMetaFile(final File blockFile) throws IOException {
final String prefix = blockFile.getName() + "_";
final File parent = blockFile.getParentFile();
final File[] matches = parent.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return dir.equals(parent) && name.startsWith(prefix)
&& name.endsWith(Block.METADATA_EXTENSION);
}
});
if (matches == null || matches.length == 0) {
throw new IOException("Meta file not found, blockFile=" + blockFile);
}
if (matches.length > 1) {
throw new IOException("Found more than one meta files: "
+ Arrays.asList(matches));
}
return matches[0];
}
public static FileDescriptor openAndSeek(File file, long offset)
throws IOException {
RandomAccessFile raf = null;
try {
raf = new RandomAccessFile(file, "r");
if (offset > 0) {
raf.seek(offset);
}
return raf.getFD();
} catch(IOException ioe) {
IOUtils.cleanup(null, raf);
throw ioe;
}
}
public static InputStream getInputStreamAndSeek(File file, long offset)
throws IOException {
RandomAccessFile raf = null;
try {
raf = new RandomAccessFile(file, "r");
raf.seek(offset);
return Channels.newInputStream(raf.getChannel());
} catch(IOException ioe) {
IOUtils.cleanupWithLogger(null, raf);
throw ioe;
}
}
public static InputStream getDirectInputStream(long addr, long length)
throws IOException {
try {
Class directByteBufferClass =
Class.forName("java.nio.DirectByteBuffer");
Constructor constructor =
directByteBufferClass.getDeclaredConstructor(long.class, int.class);
constructor.setAccessible(true);
ByteBuffer byteBuffer =
(ByteBuffer) constructor.newInstance(addr, (int)length);
return new ByteBufferBackedInputStream(byteBuffer);
} catch (ClassNotFoundException | NoSuchMethodException |
IllegalAccessException | InvocationTargetException |
InstantiationException e) {
throw new IOException(e);
}
}
/**
* Find the meta-file for the specified block file and then return the
* generation stamp from the name of the meta-file. Generally meta file will
* be the next file in sorted array of file's.
*
* @param listdir
* sorted list of file based on name.
* @param blockFile
* block file for which generation stamp is needed.
* @param index
* index of block file in array.
* @return generation stamp for block file.
*/
static long getGenerationStampFromFile(File[] listdir, File blockFile,
int index) {
String blockName = blockFile.getName();
if ((index + 1) < listdir.length) {
// Check if next index file is meta file
String metaFile = listdir[index + 1].getName();
if (metaFile.startsWith(blockName)) {
return Block.getGenerationStamp(metaFile);
}
}
FsDatasetImpl.LOG.warn("Block " + blockFile + " does not have a metafile!");
return HdfsConstants.GRANDFATHER_GENERATION_STAMP;
}
/** Find the corresponding meta data file from a given block file */
static long parseGenerationStamp(File blockFile, File metaFile
) throws IOException {
final String metaname = metaFile.getName();
final String gs = metaname.substring(blockFile.getName().length() + 1,
metaname.length() - Block.METADATA_EXTENSION.length());
try {
return Long.parseLong(gs);
} catch(NumberFormatException nfe) {
throw new IOException("Failed to parse generation stamp: blockFile="
+ blockFile + ", metaFile=" + metaFile, nfe);
}
}
/**
* Compute the checksum for a block file that does not already have
* its checksum computed, and save it to dstMeta file.
*/
public static void computeChecksum(File srcMeta, File dstMeta,
File blockFile, int smallBufferSize, Configuration conf)
throws IOException {
Preconditions.checkNotNull(srcMeta);
Preconditions.checkNotNull(dstMeta);
Preconditions.checkNotNull(blockFile);
// Create a dummy ReplicaInfo object pointing to the blockFile.
ReplicaInfo wrapper = new FinalizedReplica(0, 0, 0, null, null) {
@Override
public URI getMetadataURI() {
return srcMeta.toURI();
}
@Override
public InputStream getDataInputStream(long seekOffset)
throws IOException {
return Files.newInputStream(blockFile.toPath());
}
};
FsDatasetImpl.computeChecksum(wrapper, dstMeta, smallBufferSize, conf);
}
public static void deleteMappedFile(String filePath) throws IOException {
if (filePath == null) {
throw new IOException("The filePath should not be null!");
}
boolean result = Files.deleteIfExists(Paths.get(filePath));
if (!result) {
throw new IOException(
"Failed to delete the mapped file: " + filePath);
}
}
}
