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MAPREDUCE-5899. Support incremental data copy in DistCp. Contributed by Jing Zhao.

Browse Source 
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1596931 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2014-05-22 18:17:11 +00:00
parent 5b1e88b6d2
commit 3671a5e16f
21 changed files with 597 additions and 193 deletions
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14
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
View File

@ -2140,9 +2140,21 @@ protected Path resolveLink(Path f) throws IOException {
* in the corresponding FileSystem.
*/
public FileChecksum getFileChecksum(Path f) throws IOException {
return getFileChecksum(f, Long.MAX_VALUE);
}
/**
* Get the checksum of a file, from the beginning of the file till the
* specific length.
* @param f The file path
* @param length The length of the file range for checksum calculation
* @return The file checksum.
*/
public FileChecksum getFileChecksum(Path f, final long length)
throws IOException {
return null;
}
/**
* Set the verify checksum flag. This is only applicable if the
* corresponding FileSystem supports checksum. By default doesn't do anything.

8
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FilterFileSystem.java
View File

@ -31,7 +31,6 @@
import org.apache.hadoop.fs.permission.AclEntry;
import org.apache.hadoop.fs.permission.AclStatus;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.util.Progressable;
@ -428,7 +427,12 @@ protected Path resolveLink(Path f) throws IOException {
public FileChecksum getFileChecksum(Path f) throws IOException {
return fs.getFileChecksum(f);
}
@Override
public FileChecksum getFileChecksum(Path f, long length) throws IOException {
return fs.getFileChecksum(f, length);
}
@Override
public void setVerifyChecksum(boolean verifyChecksum) {
fs.setVerifyChecksum(verifyChecksum);

2
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/HarFileSystem.java
View File

@ -687,7 +687,7 @@ private HarStatus getFileHarStatus(Path f) throws IOException {
* @return null since no checksum algorithm is implemented.
*/
@Override
public FileChecksum getFileChecksum(Path f) {
public FileChecksum getFileChecksum(Path f, long length) {
return null;
}

11
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestHarFileSystem.java
View File

@ -139,6 +139,7 @@ public void primitiveMkdir(Path f, FsPermission absolutePermission,
public int getDefaultPort();
public String getCanonicalServiceName();
public Token<?> getDelegationToken(String renewer) throws IOException;
public FileChecksum getFileChecksum(Path f) throws IOException;
public boolean deleteOnExit(Path f) throws IOException;
public boolean cancelDeleteOnExit(Path f) throws IOException;
public Token<?>[] addDelegationTokens(String renewer, Credentials creds)
@ -223,10 +224,16 @@ static void checkInvalidPath(String s, Configuration conf) {
}
@Test
public void testFileChecksum() {
public void testFileChecksum() throws Exception {
final Path p = new Path("har://file-localhost/foo.har/file1");
final HarFileSystem harfs = new HarFileSystem();
Assert.assertEquals(null, harfs.getFileChecksum(p));
try {
Assert.assertEquals(null, harfs.getFileChecksum(p));
} finally {
if (harfs != null) {
harfs.close();
}
}
}
/**

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/fs/Hdfs.java
View File

@ -116,7 +116,7 @@ public BlockLocation[] getFileBlockLocations(Path p, long start, long len)
@Override
public FileChecksum getFileChecksum(Path f)
throws IOException, UnresolvedLinkException {
return dfs.getFileChecksum(getUriPath(f));
return dfs.getFileChecksum(getUriPath(f), Long.MAX_VALUE);
}
@Override

35
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
View File

@ -1801,15 +1801,19 @@ public HdfsFileStatus getFileLinkInfo(String src) throws IOException {
}
/**
* Get the checksum of a file.
* Get the checksum of the whole file of a range of the file. Note that the
* range always starts from the beginning of the file.
* @param src The file path
* @param length The length of the range
* @return The checksum
* @see DistributedFileSystem#getFileChecksum(Path)
*/
public MD5MD5CRC32FileChecksum getFileChecksum(String src) throws IOException {
public MD5MD5CRC32FileChecksum getFileChecksum(String src, long length)
throws IOException {
checkOpen();
return getFileChecksum(src, clientName, namenode, socketFactory,
dfsClientConf.socketTimeout, getDataEncryptionKey(),
Preconditions.checkArgument(length >= 0);
return getFileChecksum(src, length, clientName, namenode,
socketFactory, dfsClientConf.socketTimeout, getDataEncryptionKey(),
dfsClientConf.connectToDnViaHostname);
}
@ -1850,8 +1854,9 @@ public DataEncryptionKey getDataEncryptionKey()
}
/**
* Get the checksum of a file.
* Get the checksum of the whole file or a range of the file.
* @param src The file path
* @param length the length of the range, i.e., the range is [0, length]
* @param clientName the name of the client requesting the checksum.
* @param namenode the RPC proxy for the namenode
* @param socketFactory to create sockets to connect to DNs
@ -1861,12 +1866,13 @@ public DataEncryptionKey getDataEncryptionKey()
* @return The checksum
*/
private static MD5MD5CRC32FileChecksum getFileChecksum(String src,
String clientName,
ClientProtocol namenode, SocketFactory socketFactory, int socketTimeout,
long length, String clientName, ClientProtocol namenode,
SocketFactory socketFactory, int socketTimeout,
DataEncryptionKey encryptionKey, boolean connectToDnViaHostname)
throws IOException {
//get all block locations
LocatedBlocks blockLocations = callGetBlockLocations(namenode, src, 0, Long.MAX_VALUE);
//get block locations for the file range
LocatedBlocks blockLocations = callGetBlockLocations(namenode, src, 0,
length);
if (null == blockLocations) {
throw new FileNotFoundException("File does not exist: " + src);
}
@ -1878,10 +1884,11 @@ private static MD5MD5CRC32FileChecksum getFileChecksum(String src,
boolean refetchBlocks = false;
int lastRetriedIndex = -1;
//get block checksum for each block
for(int i = 0; i < locatedblocks.size(); i++) {
// get block checksum for each block
long remaining = length;
for(int i = 0; i < locatedblocks.size() && remaining > 0; i++) {
if (refetchBlocks) { // refetch to get fresh tokens
blockLocations = callGetBlockLocations(namenode, src, 0, Long.MAX_VALUE);
blockLocations = callGetBlockLocations(namenode, src, 0, length);
if (null == blockLocations) {
throw new FileNotFoundException("File does not exist: " + src);
}
@ -1890,6 +1897,10 @@ private static MD5MD5CRC32FileChecksum getFileChecksum(String src,
}
LocatedBlock lb = locatedblocks.get(i);
final ExtendedBlock block = lb.getBlock();
if (remaining < block.getNumBytes()) {
block.setNumBytes(remaining);
}
remaining -= block.getNumBytes();
final DatanodeInfo[] datanodes = lb.getLocations();
//try each datanode location of the block

31
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
View File

@ -68,14 +68,12 @@
import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.DirectoryListing;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
@ -85,7 +83,6 @@
import org.apache.hadoop.io.Text;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.token.SecretManager.InvalidToken;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.Progressable;
@ -1142,7 +1139,7 @@ public FileChecksum getFileChecksum(Path f) throws IOException {
@Override
public FileChecksum doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getFileChecksum(getPathName(p));
return dfs.getFileChecksum(getPathName(p), Long.MAX_VALUE);
}
@Override
@ -1153,6 +1150,32 @@ public FileChecksum next(final FileSystem fs, final Path p)
}.resolve(this, absF);
}
@Override
public FileChecksum getFileChecksum(Path f, final long length)
throws IOException {
statistics.incrementReadOps(1);
Path absF = fixRelativePart(f);
return new FileSystemLinkResolver<FileChecksum>() {
@Override
public FileChecksum doCall(final Path p)
throws IOException, UnresolvedLinkException {
return dfs.getFileChecksum(getPathName(p), length);
}
@Override
public FileChecksum next(final FileSystem fs, final Path p)
throws IOException {
if (fs instanceof DistributedFileSystem) {
return ((DistributedFileSystem) fs).getFileChecksum(p, length);
} else {
throw new UnsupportedFileSystemException(
"getFileChecksum(Path, long) is not supported by "
+ fs.getClass().getSimpleName());
}
}
}.resolve(this, absF);
}
@Override
public void setPermission(Path p, final FsPermission permission
) throws IOException {

77
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataXceiver.java
View File

@ -42,6 +42,7 @@
import java.net.SocketException;
import java.net.UnknownHostException;
import java.nio.channels.ClosedChannelException;
import java.security.MessageDigest;
import java.util.Arrays;
import org.apache.commons.logging.Log;
@ -83,6 +84,7 @@
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.DataChecksum;
import com.google.common.base.Preconditions;
import com.google.common.net.InetAddresses;
import com.google.protobuf.ByteString;
@ -802,7 +804,44 @@ public void transferBlock(final ExtendedBlock blk,
IOUtils.closeStream(out);
}
}
private MD5Hash calcPartialBlockChecksum(ExtendedBlock block,
long requestLength, DataChecksum checksum, DataInputStream checksumIn)
throws IOException {
final int bytesPerCRC = checksum.getBytesPerChecksum();
final int csize = checksum.getChecksumSize();
final byte[] buffer = new byte[4*1024];
MessageDigest digester = MD5Hash.getDigester();
long remaining = requestLength / bytesPerCRC * csize;
for (int toDigest = 0; remaining > 0; remaining -= toDigest) {
toDigest = checksumIn.read(buffer, 0,
(int) Math.min(remaining, buffer.length));
if (toDigest < 0) {
break;
}
digester.update(buffer, 0, toDigest);
}
int partialLength = (int) (requestLength % bytesPerCRC);
if (partialLength > 0) {
byte[] buf = new byte[partialLength];
final InputStream blockIn = datanode.data.getBlockInputStream(block,
requestLength - partialLength);
try {
// Get the CRC of the partialLength.
IOUtils.readFully(blockIn, buf, 0, partialLength);
} finally {
IOUtils.closeStream(blockIn);
}
checksum.update(buf, 0, partialLength);
byte[] partialCrc = new byte[csize];
checksum.writeValue(partialCrc, 0, true);
digester.update(partialCrc);
}
return new MD5Hash(digester.digest());
}
@Override
public void blockChecksum(final ExtendedBlock block,
final Token<BlockTokenIdentifier> blockToken) throws IOException {
@ -810,25 +849,32 @@ public void blockChecksum(final ExtendedBlock block,
getOutputStream());
checkAccess(out, true, block, blockToken,
Op.BLOCK_CHECKSUM, BlockTokenSecretManager.AccessMode.READ);
updateCurrentThreadName("Reading metadata for block " + block);
final LengthInputStream metadataIn =
datanode.data.getMetaDataInputStream(block);
final DataInputStream checksumIn = new DataInputStream(new BufferedInputStream(
metadataIn, HdfsConstants.IO_FILE_BUFFER_SIZE));
// client side now can specify a range of the block for checksum
long requestLength = block.getNumBytes();
Preconditions.checkArgument(requestLength >= 0);
long visibleLength = datanode.data.getReplicaVisibleLength(block);
boolean partialBlk = requestLength < visibleLength;
updateCurrentThreadName("Reading metadata for block " + block);
final LengthInputStream metadataIn = datanode.data
.getMetaDataInputStream(block);
final DataInputStream checksumIn = new DataInputStream(
new BufferedInputStream(metadataIn, HdfsConstants.IO_FILE_BUFFER_SIZE));
updateCurrentThreadName("Getting checksum for block " + block);
try {
//read metadata file
final BlockMetadataHeader header = BlockMetadataHeader.readHeader(checksumIn);
final DataChecksum checksum = header.getChecksum();
final BlockMetadataHeader header = BlockMetadataHeader
.readHeader(checksumIn);
final DataChecksum checksum = header.getChecksum();
final int csize = checksum.getChecksumSize();
final int bytesPerCRC = checksum.getBytesPerChecksum();
final long crcPerBlock = checksum.getChecksumSize() > 0
? (metadataIn.getLength() - BlockMetadataHeader.getHeaderSize())/checksum.getChecksumSize()
: 0;
//compute block checksum
final MD5Hash md5 = MD5Hash.digest(checksumIn);
final long crcPerBlock = csize <= 0 ? 0 :
(metadataIn.getLength() - BlockMetadataHeader.getHeaderSize()) / csize;
final MD5Hash md5 = partialBlk && crcPerBlock > 0 ?
calcPartialBlockChecksum(block, requestLength, checksum, checksumIn)
: MD5Hash.digest(checksumIn);
if (LOG.isDebugEnabled()) {
LOG.debug("block=" + block + ", bytesPerCRC=" + bytesPerCRC
+ ", crcPerBlock=" + crcPerBlock + ", md5=" + md5);
@ -841,8 +887,7 @@ public void blockChecksum(final ExtendedBlock block,
.setBytesPerCrc(bytesPerCRC)
.setCrcPerBlock(crcPerBlock)
.setMd5(ByteString.copyFrom(md5.getDigest()))
.setCrcType(PBHelper.convert(checksum.getChecksumType()))
)
.setCrcType(PBHelper.convert(checksum.getChecksumType())))
.build()
.writeDelimitedTo(out);
out.flush();

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/resources/DatanodeWebHdfsMethods.java
View File

@ -74,7 +74,6 @@
import org.apache.hadoop.hdfs.web.resources.ReplicationParam;
import org.apache.hadoop.hdfs.web.resources.UriFsPathParam;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
@ -452,7 +451,7 @@ private Response get(
MD5MD5CRC32FileChecksum checksum = null;
DFSClient dfsclient = newDfsClient(nnId, conf);
try {
checksum = dfsclient.getFileChecksum(fullpath);
checksum = dfsclient.getFileChecksum(fullpath, Long.MAX_VALUE);
dfsclient.close();
dfsclient = null;
} finally {

75
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestGetFileChecksum.java Normal file
View File

@ -0,0 +1,75 @@
/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.Path;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class TestGetFileChecksum {
private static final int BLOCKSIZE = 1024;
private static final short REPLICATION = 3;
private Configuration conf;
private MiniDFSCluster cluster;
private DistributedFileSystem dfs;
@Before
public void setUp() throws Exception {
conf = new Configuration();
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCKSIZE);
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION)
.build();
cluster.waitActive();
dfs = cluster.getFileSystem();
}
@After
public void tearDown() throws Exception {
if (cluster != null) {
cluster.shutdown();
}
}
public void testGetFileChecksum(final Path foo, final int appendLength)
throws Exception {
final int appendRounds = 16;
FileChecksum[] fc = new FileChecksum[appendRounds + 1];
DFSTestUtil.createFile(dfs, foo, appendLength, REPLICATION, 0L);
fc[0] = dfs.getFileChecksum(foo);
for (int i = 0; i < appendRounds; i++) {
DFSTestUtil.appendFile(dfs, foo, appendLength);
fc[i + 1] = dfs.getFileChecksum(foo);
}
for (int i = 0; i < appendRounds + 1; i++) {
FileChecksum checksum = dfs.getFileChecksum(foo, appendLength * (i+1));
Assert.assertTrue(checksum.equals(fc[i]));
}
}
@Test
public void testGetFileChecksum() throws Exception {
testGetFileChecksum(new Path("/foo"), BLOCKSIZE / 4);
testGetFileChecksum(new Path("/bar"), BLOCKSIZE / 4 - 1);
}
}

2
hadoop-mapreduce-project/CHANGES.txt
View File

@ -202,6 +202,8 @@ Release 2.5.0 - UNRELEASED
MAPREDUCE-5809. Enhance distcp to support preserving HDFS ACLs. (cnauroth)
MAPREDUCE-5899. Support incremental data copy in DistCp. (jing9)
OPTIMIZATIONS
BUG FIXES

1
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpConstants.java
View File

@ -50,6 +50,7 @@ public class DistCpConstants {
public static final String CONF_LABEL_COPY_STRATEGY = "distcp.copy.strategy";
public static final String CONF_LABEL_SKIP_CRC = "distcp.skip.crc";
public static final String CONF_LABEL_OVERWRITE = "distcp.copy.overwrite";
public static final String CONF_LABEL_APPEND = "distcp.copy.append";
public static final String CONF_LABEL_BANDWIDTH_MB = "distcp.map.bandwidth.mb";
public static final String CONF_LABEL_MAX_CHUNKS_TOLERABLE =

4
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptionSwitch.java
View File

@ -138,6 +138,10 @@ public enum DistCpOptionSwitch {
new Option("overwrite", false, "Choose to overwrite target files " +
"unconditionally, even if they exist.")),
APPEND(DistCpConstants.CONF_LABEL_APPEND,
new Option("append", false,
"Reuse existing data in target files and append new data to them if possible")),
/**
* Should DisctpExecution be blocking
*/

28
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptions.java
View File

@ -39,6 +39,7 @@ public class DistCpOptions {
private boolean deleteMissing = false;
private boolean ignoreFailures = false;
private boolean overwrite = false;
private boolean append = false;
private boolean skipCRC = false;
private boolean blocking = true;
@ -244,6 +245,22 @@ public void setOverwrite(boolean overwrite) {
this.overwrite = overwrite;
}
/**
* @return whether we can append new data to target files
*/
public boolean shouldAppend() {
return append;
}
/**
* Set if we want to append new data to target files. This is valid only with
* update option and CRC is not skipped.
*/
public void setAppend(boolean append) {
validate(DistCpOptionSwitch.APPEND, append);
this.append = append;
}
/**
* Should CRC/checksum check be skipped while checking files are identical
*
@ -472,6 +489,7 @@ public void validate(DistCpOptionSwitch option, boolean value) {
value : this.atomicCommit);
boolean skipCRC = (option == DistCpOptionSwitch.SKIP_CRC ?
value : this.skipCRC);
boolean append = (option == DistCpOptionSwitch.APPEND ? value : this.append);
if (syncFolder && atomicCommit) {
throw new IllegalArgumentException("Atomic commit can't be used with " +
@ -492,6 +510,14 @@ public void validate(DistCpOptionSwitch option, boolean value) {
throw new IllegalArgumentException("Skip CRC is valid only with update options");
}
if (!syncFolder && append) {
throw new IllegalArgumentException(
"Append is valid only with update options");
}
if (skipCRC && append) {
throw new IllegalArgumentException(
"Append is disallowed when skipping CRC");
}
}
/**
@ -510,6 +536,8 @@ public void appendToConf(Configuration conf) {
String.valueOf(deleteMissing));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.OVERWRITE,
String.valueOf(overwrite));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.APPEND,
String.valueOf(append));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.SKIP_CRC,
String.valueOf(skipCRC));
DistCpOptionSwitch.addToConf(conf, DistCpOptionSwitch.BANDWIDTH,

4
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/OptionsParser.java
View File

@ -140,6 +140,10 @@ public static DistCpOptions parse(String args[]) throws IllegalArgumentException
option.setOverwrite(true);
}
if (command.hasOption(DistCpOptionSwitch.APPEND.getSwitch())) {
option.setAppend(true);
}
if (command.hasOption(DistCpOptionSwitch.DELETE_MISSING.getSwitch())) {
option.setDeleteMissing(true);
}

105
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyMapper.java
View File

@ -18,13 +18,20 @@
package org.apache.hadoop.tools.mapred;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.EnumSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.AclEntry;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.Mapper;
@ -36,11 +43,6 @@
import org.apache.hadoop.tools.util.DistCpUtils;
import org.apache.hadoop.util.StringUtils;
import java.io.*;
import java.util.EnumSet;
import java.util.Arrays;
import java.util.List;
/**
* Mapper class that executes the DistCp copy operation.
* Implements the o.a.h.mapreduce.Mapper<> interface.
@ -62,6 +64,15 @@ public static enum Counter {
BYTESSKIPPED, // Number of bytes that were skipped from copy.
}
/**
* Indicate the action for each file
*/
static enum FileAction {
SKIP, // Skip copying the file since it's already in the target FS
APPEND, // Only need to append new data to the file in the target FS
OVERWRITE, // Overwrite the whole file
}
private static Log LOG = LogFactory.getLog(CopyMapper.class);
private Configuration conf;
@ -70,6 +81,7 @@ public static enum Counter {
private boolean ignoreFailures = false;
private boolean skipCrc = false;
private boolean overWrite = false;
private boolean append = false;
private EnumSet<FileAttribute> preserve = EnumSet.noneOf(FileAttribute.class);
private FileSystem targetFS = null;
@ -90,6 +102,7 @@ public void setup(Context context) throws IOException, InterruptedException {
ignoreFailures = conf.getBoolean(DistCpOptionSwitch.IGNORE_FAILURES.getConfigLabel(), false);
skipCrc = conf.getBoolean(DistCpOptionSwitch.SKIP_CRC.getConfigLabel(), false);
overWrite = conf.getBoolean(DistCpOptionSwitch.OVERWRITE.getConfigLabel(), false);
append = conf.getBoolean(DistCpOptionSwitch.APPEND.getConfigLabel(), false);
preserve = DistCpUtils.unpackAttributes(conf.get(DistCpOptionSwitch.
PRESERVE_STATUS.getConfigLabel()));
@ -224,20 +237,19 @@ public void map(Text relPath, CopyListingFileStatus sourceFileStatus,
return;
}
if (skipFile(sourceFS, sourceCurrStatus, target)) {
FileAction action = checkUpdate(sourceFS, sourceCurrStatus, target);
if (action == FileAction.SKIP) {
LOG.info("Skipping copy of " + sourceCurrStatus.getPath()
+ " to " + target);
updateSkipCounters(context, sourceCurrStatus);
context.write(null, new Text("SKIP: " + sourceCurrStatus.getPath()));
}
else {
} else {
copyFileWithRetry(description, sourceCurrStatus, target, context,
fileAttributes);
action, fileAttributes);
}
DistCpUtils.preserve(target.getFileSystem(conf), target,
sourceCurrStatus, fileAttributes);
} catch (IOException exception) {
handleFailures(exception, sourceFileStatus, target, context);
}
@ -254,14 +266,14 @@ private String getFileType(FileStatus fileStatus) {
return DistCpUtils.unpackAttributes(attributeString);
}
private void copyFileWithRetry(String description, FileStatus sourceFileStatus,
Path target, Context context,
EnumSet<DistCpOptions.FileAttribute> fileAttributes) throws IOException {
private void copyFileWithRetry(String description,
FileStatus sourceFileStatus, Path target, Context context,
FileAction action, EnumSet<DistCpOptions.FileAttribute> fileAttributes)
throws IOException {
long bytesCopied;
try {
bytesCopied = (Long)new RetriableFileCopyCommand(skipCrc, description)
.execute(sourceFileStatus, target, context, fileAttributes);
bytesCopied = (Long) new RetriableFileCopyCommand(skipCrc, description,
action).execute(sourceFileStatus, target, context, fileAttributes);
} catch (Exception e) {
context.setStatus("Copy Failure: " + sourceFileStatus.getPath());
throw new IOException("File copy failed: " + sourceFileStatus.getPath() +
@ -311,25 +323,48 @@ private static void incrementCounter(Context context, Counter counter,
context.getCounter(counter).increment(value);
}
private boolean skipFile(FileSystem sourceFS, FileStatus source, Path target)
throws IOException {
return targetFS.exists(target)
&& !overWrite
&& !mustUpdate(sourceFS, source, target);
private FileAction checkUpdate(FileSystem sourceFS, FileStatus source,
Path target) throws IOException {
final FileStatus targetFileStatus;
try {
targetFileStatus = targetFS.getFileStatus(target);
} catch (FileNotFoundException e) {
return FileAction.OVERWRITE;
}
if (targetFileStatus != null && !overWrite) {
if (canSkip(sourceFS, source, targetFileStatus)) {
return FileAction.SKIP;
} else if (append) {
long targetLen = targetFileStatus.getLen();
if (targetLen < source.getLen()) {
FileChecksum sourceChecksum = sourceFS.getFileChecksum(
source.getPath(), targetLen);
if (sourceChecksum != null
&& sourceChecksum.equals(targetFS.getFileChecksum(target))) {
// We require that the checksum is not null. Thus currently only
// DistributedFileSystem is supported
return FileAction.APPEND;
}
}
}
}
return FileAction.OVERWRITE;
}
private boolean mustUpdate(FileSystem sourceFS, FileStatus source, Path target)
throws IOException {
final FileStatus targetFileStatus = targetFS.getFileStatus(target);
return syncFolders
&& (
targetFileStatus.getLen() != source.getLen()
|| (!skipCrc &&
!DistCpUtils.checksumsAreEqual(sourceFS,
source.getPath(), null, targetFS, target))
|| (source.getBlockSize() != targetFileStatus.getBlockSize() &&
preserve.contains(FileAttribute.BLOCKSIZE))
);
private boolean canSkip(FileSystem sourceFS, FileStatus source,
FileStatus target) throws IOException {
if (!syncFolders) {
return true;
}
boolean sameLength = target.getLen() == source.getLen();
boolean sameBlockSize = source.getBlockSize() == target.getBlockSize()
|| !preserve.contains(FileAttribute.BLOCKSIZE);
if (sameLength && sameBlockSize) {
return skipCrc ||
DistCpUtils.checksumsAreEqual(sourceFS, source.getPath(), null,
targetFS, target.getPath());
} else {
return false;
}
}
}

120
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java
View File

@ -18,10 +18,8 @@
package org.apache.hadoop.tools.mapred;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.EnumSet;
@ -29,6 +27,8 @@
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
@ -39,6 +39,7 @@
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.tools.DistCpConstants;
import org.apache.hadoop.tools.DistCpOptions.FileAttribute;
import org.apache.hadoop.tools.mapred.CopyMapper.FileAction;
import org.apache.hadoop.tools.util.DistCpUtils;
import org.apache.hadoop.tools.util.RetriableCommand;
import org.apache.hadoop.tools.util.ThrottledInputStream;
@ -54,13 +55,15 @@ public class RetriableFileCopyCommand extends RetriableCommand {
private static Log LOG = LogFactory.getLog(RetriableFileCopyCommand.class);
private static int BUFFER_SIZE = 8 * 1024;
private boolean skipCrc = false;
private FileAction action;
/**
* Constructor, taking a description of the action.
* @param description Verbose description of the copy operation.
*/
public RetriableFileCopyCommand(String description) {
public RetriableFileCopyCommand(String description, FileAction action) {
super(description);
this.action = action;
}
/**
@ -68,9 +71,11 @@ public RetriableFileCopyCommand(String description) {
*
* @param skipCrc Whether to skip the crc check.
* @param description A verbose description of the copy operation.
* @param action We should overwrite the target file or append new data to it.
*/
public RetriableFileCopyCommand(boolean skipCrc, String description) {
this(description);
public RetriableFileCopyCommand(boolean skipCrc, String description,
FileAction action) {
this(description, action);
this.skipCrc = skipCrc;
}
@ -96,18 +101,17 @@ protected Object doExecute(Object... arguments) throws Exception {
}
private long doCopy(FileStatus sourceFileStatus, Path target,
Mapper.Context context,
EnumSet<FileAttribute> fileAttributes)
throws IOException {
Path tmpTargetPath = getTmpFile(target, context);
Mapper.Context context, EnumSet<FileAttribute> fileAttributes)
throws IOException {
final boolean toAppend = action == FileAction.APPEND;
Path targetPath = toAppend ? target : getTmpFile(target, context);
final Configuration configuration = context.getConfiguration();
FileSystem targetFS = target.getFileSystem(configuration);
try {
if (LOG.isDebugEnabled()) {
LOG.debug("Copying " + sourceFileStatus.getPath() + " to " + target);
LOG.debug("Tmp-file path: " + tmpTargetPath);
LOG.debug("Target file path: " + targetPath);
}
final Path sourcePath = sourceFileStatus.getPath();
final FileSystem sourceFS = sourcePath.getFileSystem(configuration);
@ -115,22 +119,31 @@ private long doCopy(FileStatus sourceFileStatus, Path target,
.contains(FileAttribute.CHECKSUMTYPE) ? sourceFS
.getFileChecksum(sourcePath) : null;
long bytesRead = copyToTmpFile(tmpTargetPath, targetFS, sourceFileStatus,
context, fileAttributes, sourceChecksum);
final long offset = action == FileAction.APPEND ? targetFS.getFileStatus(
target).getLen() : 0;
long bytesRead = copyToFile(targetPath, targetFS, sourceFileStatus,
offset, context, fileAttributes, sourceChecksum);
compareFileLengths(sourceFileStatus, tmpTargetPath, configuration,
bytesRead);
compareFileLengths(sourceFileStatus, targetPath, configuration, bytesRead
+ offset);
//At this point, src&dest lengths are same. if length==0, we skip checksum
if ((bytesRead != 0) && (!skipCrc)) {
compareCheckSums(sourceFS, sourceFileStatus.getPath(), sourceChecksum,
targetFS, tmpTargetPath);
targetFS, targetPath);
}
// it's not append case, thus we first write to a temporary file, rename
// it to the target path.
if (!toAppend) {
promoteTmpToTarget(targetPath, target, targetFS);
}
promoteTmpToTarget(tmpTargetPath, target, targetFS);
return bytesRead;
} finally {
if (targetFS.exists(tmpTargetPath))
targetFS.delete(tmpTargetPath, false);
// note that for append case, it is possible that we append partial data
// and then fail. In that case, for the next retry, we either reuse the
// partial appended data if it is good or we overwrite the whole file
if (!toAppend && targetFS.exists(targetPath)) {
targetFS.delete(targetPath, false);
}
}
}
@ -147,29 +160,37 @@ private ChecksumOpt getChecksumOpt(EnumSet<FileAttribute> fileAttributes,
return null;
}
private long copyToTmpFile(Path tmpTargetPath, FileSystem targetFS,
FileStatus sourceFileStatus, Mapper.Context context,
private long copyToFile(Path targetPath, FileSystem targetFS,
FileStatus sourceFileStatus, long sourceOffset, Mapper.Context context,
EnumSet<FileAttribute> fileAttributes, final FileChecksum sourceChecksum)
throws IOException {
FsPermission permission = FsPermission.getFileDefault().applyUMask(
FsPermission.getUMask(targetFS.getConf()));
OutputStream outStream = new BufferedOutputStream(
targetFS.create(tmpTargetPath, permission,
EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE), BUFFER_SIZE,
getReplicationFactor(fileAttributes, sourceFileStatus, targetFS,
tmpTargetPath),
getBlockSize(fileAttributes, sourceFileStatus, targetFS,
tmpTargetPath),
context, getChecksumOpt(fileAttributes, sourceChecksum)));
return copyBytes(sourceFileStatus, outStream, BUFFER_SIZE, context);
final OutputStream outStream;
if (action == FileAction.OVERWRITE) {
final short repl = getReplicationFactor(fileAttributes, sourceFileStatus,
targetFS, targetPath);
final long blockSize = getBlockSize(fileAttributes, sourceFileStatus,
targetFS, targetPath);
FSDataOutputStream out = targetFS.create(targetPath, permission,
EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
BUFFER_SIZE, repl, blockSize, context,
getChecksumOpt(fileAttributes, sourceChecksum));
outStream = new BufferedOutputStream(out);
} else {
outStream = new BufferedOutputStream(targetFS.append(targetPath,
BUFFER_SIZE));
}
return copyBytes(sourceFileStatus, sourceOffset, outStream, BUFFER_SIZE,
context);
}
private void compareFileLengths(FileStatus sourceFileStatus, Path target,
Configuration configuration, long bytesRead)
Configuration configuration, long targetLen)
throws IOException {
final Path sourcePath = sourceFileStatus.getPath();
FileSystem fs = sourcePath.getFileSystem(configuration);
if (fs.getFileStatus(sourcePath).getLen() != bytesRead)
if (fs.getFileStatus(sourcePath).getLen() != targetLen)
throw new IOException("Mismatch in length of source:" + sourcePath
+ " and target:" + target);
}
@ -215,8 +236,8 @@ private Path getTmpFile(Path target, Mapper.Context context) {
}
@VisibleForTesting
long copyBytes(FileStatus sourceFileStatus, OutputStream outStream,
int bufferSize, Mapper.Context context)
long copyBytes(FileStatus sourceFileStatus, long sourceOffset,
OutputStream outStream, int bufferSize, Mapper.Context context)
throws IOException {
Path source = sourceFileStatus.getPath();
byte buf[] = new byte[bufferSize];
@ -225,19 +246,21 @@ long copyBytes(FileStatus sourceFileStatus, OutputStream outStream,
try {
inStream = getInputStream(source, context.getConfiguration());
int bytesRead = readBytes(inStream, buf);
int bytesRead = readBytes(inStream, buf, sourceOffset);
while (bytesRead >= 0) {
totalBytesRead += bytesRead;
if (action == FileAction.APPEND) {
sourceOffset += bytesRead;
}
outStream.write(buf, 0, bytesRead);
updateContextStatus(totalBytesRead, context, sourceFileStatus);
bytesRead = inStream.read(buf);
bytesRead = readBytes(inStream, buf, sourceOffset);
}
outStream.close();
outStream = null;
} finally {
IOUtils.cleanup(LOG, outStream, inStream);
}
return totalBytesRead;
}
@ -254,24 +277,27 @@ private void updateContextStatus(long totalBytesRead, Mapper.Context context,
context.setStatus(message.toString());
}
private static int readBytes(InputStream inStream, byte buf[])
throws IOException {
private static int readBytes(ThrottledInputStream inStream, byte buf[],
long position) throws IOException {
try {
return inStream.read(buf);
}
catch (IOException e) {
if (position == 0) {
return inStream.read(buf);
} else {
return inStream.read(position, buf, 0, buf.length);
}
} catch (IOException e) {
throw new CopyReadException(e);
}
}
private static ThrottledInputStream getInputStream(Path path, Configuration conf)
throws IOException {
private static ThrottledInputStream getInputStream(Path path,
Configuration conf) throws IOException {
try {
FileSystem fs = path.getFileSystem(conf);
long bandwidthMB = conf.getInt(DistCpConstants.CONF_LABEL_BANDWIDTH_MB,
DistCpConstants.DEFAULT_BANDWIDTH_MB);
return new ThrottledInputStream(new BufferedInputStream(fs.open(path)),
bandwidthMB * 1024 * 1024);
FSDataInputStream in = fs.open(path);
return new ThrottledInputStream(in, bandwidthMB * 1024 * 1024);
}
catch (IOException e) {
throw new CopyReadException(e);

24
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/util/ThrottledInputStream.java
View File

@ -21,6 +21,11 @@
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.PositionedReadable;
import com.google.common.base.Preconditions;
/**
* The ThrottleInputStream provides bandwidth throttling on a specified
* InputStream. It is implemented as a wrapper on top of another InputStream
@ -90,6 +95,25 @@ public int read(byte[] b, int off, int len) throws IOException {
return readLen;
}
/**
* Read bytes starting from the specified position. This requires rawStream is
* an instance of {@link PositionedReadable}.
*/
public int read(long position, byte[] buffer, int offset, int length)
throws IOException {
if (!(rawStream instanceof PositionedReadable)) {
throw new UnsupportedOperationException(
"positioned read is not supported by the internal stream");
}
throttle();
int readLen = ((PositionedReadable) rawStream).read(position, buffer,
offset, length);
if (readLen != -1) {
bytesRead += readLen;
}
return readLen;
}
private void throttle() throws IOException {
if (getBytesPerSec() > maxBytesPerSec) {
try {

44
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestOptionsParser.java
View File

@ -18,9 +18,12 @@
package org.apache.hadoop.tools;
import static org.junit.Assert.fail;
import org.junit.Assert;
import org.junit.Test;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.tools.DistCpOptions.*;
import org.apache.hadoop.conf.Configuration;
@ -554,4 +557,45 @@ public void testOptionsAppendToConf() {
Assert.assertEquals(conf.get(DistCpOptionSwitch.PRESERVE_STATUS.getConfigLabel()), "U");
Assert.assertEquals(conf.getInt(DistCpOptionSwitch.BANDWIDTH.getConfigLabel(), -1), 11);
}
@Test
public void testAppendOption() {
Configuration conf = new Configuration();
Assert.assertFalse(conf.getBoolean(
DistCpOptionSwitch.APPEND.getConfigLabel(), false));
Assert.assertFalse(conf.getBoolean(
DistCpOptionSwitch.SYNC_FOLDERS.getConfigLabel(), false));
DistCpOptions options = OptionsParser.parse(new String[] { "-update",
"-append", "hdfs://localhost:8020/source/first",
"hdfs://localhost:8020/target/" });
options.appendToConf(conf);
Assert.assertTrue(conf.getBoolean(
DistCpOptionSwitch.APPEND.getConfigLabel(), false));
Assert.assertTrue(conf.getBoolean(
DistCpOptionSwitch.SYNC_FOLDERS.getConfigLabel(), false));
// make sure -append is only valid when -update is specified
try {
options = OptionsParser.parse(new String[] { "-append",
"hdfs://localhost:8020/source/first",
"hdfs://localhost:8020/target/" });
fail("Append should fail if update option is not specified");
} catch (IllegalArgumentException e) {
GenericTestUtils.assertExceptionContains(
"Append is valid only with update options", e);
}
// make sure -append is invalid when skipCrc is specified
try {
options = OptionsParser.parse(new String[] {
"-append", "-update", "-skipcrccheck",
"hdfs://localhost:8020/source/first",
"hdfs://localhost:8020/target/" });
fail("Append should fail if skipCrc option is specified");
} catch (IllegalArgumentException e) {
GenericTestUtils.assertExceptionContains(
"Append is disallowed when skipping CRC", e);
}
}
}

195
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestCopyMapper.java
View File

@ -25,11 +25,13 @@
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Options.ChecksumOpt;
@ -118,6 +120,16 @@ private static void createSourceData() throws Exception {
touchFile(SOURCE_PATH + "/7/8/9");
}
private static void appendSourceData() throws Exception {
FileSystem fs = cluster.getFileSystem();
for (Path source : pathList) {
if (fs.getFileStatus(source).isFile()) {
// append 2048 bytes per file
appendFile(source, DEFAULT_FILE_SIZE * 2);
}
}
}
private static void createSourceDataWithDifferentBlockSize() throws Exception {
mkdirs(SOURCE_PATH + "/1");
mkdirs(SOURCE_PATH + "/2");
@ -201,85 +213,132 @@ private static void touchFile(String path, boolean createMultipleBlocks,
}
}
/**
* Append specified length of bytes to a given file
*/
private static void appendFile(Path p, int length) throws IOException {
byte[] toAppend = new byte[length];
Random random = new Random();
random.nextBytes(toAppend);
FSDataOutputStream out = cluster.getFileSystem().append(p);
try {
out.write(toAppend);
} finally {
IOUtils.closeStream(out);
}
}
@Test
public void testCopyWithDifferentChecksumType() throws Exception {
testCopy(true);
}
@Test(timeout=40000)
public void testRun() {
public void testRun() throws Exception {
testCopy(false);
}
private void testCopy(boolean preserveChecksum) {
try {
deleteState();
if (preserveChecksum) {
createSourceDataWithDifferentChecksumType();
} else {
createSourceData();
}
@Test
public void testCopyWithAppend() throws Exception {
final FileSystem fs = cluster.getFileSystem();
// do the first distcp
testCopy(false);
// start appending data to source
appendSourceData();
FileSystem fs = cluster.getFileSystem();
CopyMapper copyMapper = new CopyMapper();
StubContext stubContext = new StubContext(getConfiguration(), null, 0);
Mapper<Text, CopyListingFileStatus, Text, Text>.Context context
= stubContext.getContext();
Configuration configuration = context.getConfiguration();
EnumSet<DistCpOptions.FileAttribute> fileAttributes
= EnumSet.of(DistCpOptions.FileAttribute.REPLICATION);
if (preserveChecksum) {
fileAttributes.add(DistCpOptions.FileAttribute.CHECKSUMTYPE);
}
configuration.set(DistCpOptionSwitch.PRESERVE_STATUS.getConfigLabel(),
DistCpUtils.packAttributes(fileAttributes));
copyMapper.setup(context);
for (Path path: pathList) {
copyMapper.map(new Text(DistCpUtils.getRelativePath(new Path(SOURCE_PATH), path)),
new CopyListingFileStatus(fs.getFileStatus(path)), context);
}
// Check that the maps worked.
for (Path path : pathList) {
final Path targetPath = new Path(path.toString()
.replaceAll(SOURCE_PATH, TARGET_PATH));
Assert.assertTrue(fs.exists(targetPath));
Assert.assertTrue(fs.isFile(targetPath) == fs.isFile(path));
FileStatus sourceStatus = fs.getFileStatus(path);
FileStatus targetStatus = fs.getFileStatus(targetPath);
Assert.assertEquals(sourceStatus.getReplication(),
targetStatus.getReplication());
if (preserveChecksum) {
Assert.assertEquals(sourceStatus.getBlockSize(),
targetStatus.getBlockSize());
}
Assert.assertTrue(!fs.isFile(targetPath)
|| fs.getFileChecksum(targetPath).equals(fs.getFileChecksum(path)));
}
Assert.assertEquals(pathList.size(),
stubContext.getReporter().getCounter(CopyMapper.Counter.COPY).getValue());
if (!preserveChecksum) {
Assert.assertEquals(nFiles * DEFAULT_FILE_SIZE, stubContext
.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED)
.getValue());
} else {
Assert.assertEquals(nFiles * NON_DEFAULT_BLOCK_SIZE * 2, stubContext
.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED)
.getValue());
}
testCopyingExistingFiles(fs, copyMapper, context);
for (Text value : stubContext.getWriter().values()) {
Assert.assertTrue(value.toString() + " is not skipped", value.toString().startsWith("SKIP:"));
}
// do the distcp again with -update and -append option
CopyMapper copyMapper = new CopyMapper();
StubContext stubContext = new StubContext(getConfiguration(), null, 0);
Mapper<Text, CopyListingFileStatus, Text, Text>.Context context =
stubContext.getContext();
// Enable append
context.getConfiguration().setBoolean(
DistCpOptionSwitch.APPEND.getConfigLabel(), true);
copyMapper.setup(context);
for (Path path: pathList) {
copyMapper.map(new Text(DistCpUtils.getRelativePath(new Path(SOURCE_PATH), path)),
new CopyListingFileStatus(cluster.getFileSystem().getFileStatus(
path)), context);
}
catch (Exception e) {
LOG.error("Unexpected exception: ", e);
Assert.assertTrue(false);
verifyCopy(fs, false);
// verify that we only copied new appended data
Assert.assertEquals(nFiles * DEFAULT_FILE_SIZE * 2, stubContext
.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED)
.getValue());
Assert.assertEquals(pathList.size(), stubContext.getReporter().
getCounter(CopyMapper.Counter.COPY).getValue());
}
private void testCopy(boolean preserveChecksum) throws Exception {
deleteState();
if (preserveChecksum) {
createSourceDataWithDifferentChecksumType();
} else {
createSourceData();
}
FileSystem fs = cluster.getFileSystem();
CopyMapper copyMapper = new CopyMapper();
StubContext stubContext = new StubContext(getConfiguration(), null, 0);
Mapper<Text, CopyListingFileStatus, Text, Text>.Context context
= stubContext.getContext();
Configuration configuration = context.getConfiguration();
EnumSet<DistCpOptions.FileAttribute> fileAttributes
= EnumSet.of(DistCpOptions.FileAttribute.REPLICATION);
if (preserveChecksum) {
fileAttributes.add(DistCpOptions.FileAttribute.CHECKSUMTYPE);
}
configuration.set(DistCpOptionSwitch.PRESERVE_STATUS.getConfigLabel(),
DistCpUtils.packAttributes(fileAttributes));
copyMapper.setup(context);
for (Path path: pathList) {
copyMapper.map(
new Text(DistCpUtils.getRelativePath(new Path(SOURCE_PATH), path)),
new CopyListingFileStatus(fs.getFileStatus(path)), context);
}
// Check that the maps worked.
verifyCopy(fs, preserveChecksum);
Assert.assertEquals(pathList.size(), stubContext.getReporter()
.getCounter(CopyMapper.Counter.COPY).getValue());
if (!preserveChecksum) {
Assert.assertEquals(nFiles * DEFAULT_FILE_SIZE, stubContext
.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED)
.getValue());
} else {
Assert.assertEquals(nFiles * NON_DEFAULT_BLOCK_SIZE * 2, stubContext
.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED)
.getValue());
}
testCopyingExistingFiles(fs, copyMapper, context);
for (Text value : stubContext.getWriter().values()) {
Assert.assertTrue(value.toString() + " is not skipped", value
.toString().startsWith("SKIP:"));
}
}
private void verifyCopy(FileSystem fs, boolean preserveChecksum)
throws Exception {
for (Path path : pathList) {
final Path targetPath = new Path(path.toString().replaceAll(SOURCE_PATH,
TARGET_PATH));
Assert.assertTrue(fs.exists(targetPath));
Assert.assertTrue(fs.isFile(targetPath) == fs.isFile(path));
FileStatus sourceStatus = fs.getFileStatus(path);
FileStatus targetStatus = fs.getFileStatus(targetPath);
Assert.assertEquals(sourceStatus.getReplication(),
targetStatus.getReplication());
if (preserveChecksum) {
Assert.assertEquals(sourceStatus.getBlockSize(),
targetStatus.getBlockSize());
}
Assert.assertTrue(!fs.isFile(targetPath)
|| fs.getFileChecksum(targetPath).equals(fs.getFileChecksum(path)));
}
}

5
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestRetriableFileCopyCommand.java
View File

@ -22,6 +22,7 @@
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.tools.mapred.CopyMapper.FileAction;
import org.junit.Test;
import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
@ -48,8 +49,8 @@ public void testFailOnCloseError() throws Exception {
Exception actualEx = null;
try {
new RetriableFileCopyCommand("testFailOnCloseError")
.copyBytes(stat, out, 512, context);
new RetriableFileCopyCommand("testFailOnCloseError", FileAction.OVERWRITE)
.copyBytes(stat, 0, out, 512, context);
} catch (Exception e) {
actualEx = e;
}