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MAPREDUCE-5065. DistCp should skip checksum comparisons if block-sizes are different on source/target. Contributed by Mithun Radhakrishnan. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1468629 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Kihwal Lee 2013-04-16 22:01:18 +00:00
parent 9ea20fc537
commit 2e789dd9a6
3 changed files with 93 additions and 21 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
View File

@ -857,6 +857,9 @@ Release 0.23.8 - UNRELEASED
IMPROVEMENTS
MAPREDUCE-5065. DistCp should skip checksum comparisons if block-sizes
are different on source/target (Mithun Radhakrishnan via kihwal)
OPTIMIZATIONS
BUG FIXES

15
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java
View File

@ -140,10 +140,17 @@ public class RetriableFileCopyCommand extends RetriableCommand {
private void compareCheckSums(FileSystem sourceFS, Path source,
FileSystem targetFS, Path target)
throws IOException {
if (!DistCpUtils.checksumsAreEqual(sourceFS, source, targetFS, target))
throw new IOException("Check-sum mismatch between "
+ source + " and " + target);
if (!DistCpUtils.checksumsAreEqual(sourceFS, source, targetFS, target)) {
StringBuilder errorMessage = new StringBuilder("Check-sum mismatch between ")
.append(source).append(" and ").append(target).append(".");
if (sourceFS.getFileStatus(source).getBlockSize() != targetFS.getFileStatus(target).getBlockSize()) {
errorMessage.append(" Source and target differ in block-size.")
.append(" Use -pb to preserve block-sizes during copy.")
.append(" Alternatively, skip checksum-checks altogether, using -skipCrc.")
.append(" (NOTE: By skipping checksums, one runs the risk of masking data-corruption during file-transfer.)");
}
throw new IOException(errorMessage.toString());
}
}
//If target file exists and unable to delete target - fail

96
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestCopyMapper.java
View File

@ -53,7 +53,7 @@ public class TestCopyMapper {
private static final Log LOG = LogFactory.getLog(TestCopyMapper.class);
private static List<Path> pathList = new ArrayList<Path>();
private static int nFiles = 0;
private static final int FILE_SIZE = 1024;
private static final int DEFAULT_FILE_SIZE = 1024;
private static MiniDFSCluster cluster;
@ -92,7 +92,7 @@ public class TestCopyMapper {
configuration.setBoolean(DistCpOptionSwitch.OVERWRITE.getConfigLabel(),
false);
configuration.setBoolean(DistCpOptionSwitch.SKIP_CRC.getConfigLabel(),
true);
false);
configuration.setBoolean(DistCpOptionSwitch.SYNC_FOLDERS.getConfigLabel(),
true);
configuration.set(DistCpOptionSwitch.PRESERVE_STATUS.getConfigLabel(),
@ -112,6 +112,18 @@ public class TestCopyMapper {
touchFile(SOURCE_PATH + "/7/8/9");
}
private static void createSourceDataWithDifferentBlockSize() throws Exception {
mkdirs(SOURCE_PATH + "/1");
mkdirs(SOURCE_PATH + "/2");
mkdirs(SOURCE_PATH + "/2/3/4");
mkdirs(SOURCE_PATH + "/2/3");
mkdirs(SOURCE_PATH + "/5");
touchFile(SOURCE_PATH + "/5/6", true);
mkdirs(SOURCE_PATH + "/7");
mkdirs(SOURCE_PATH + "/7/8");
touchFile(SOURCE_PATH + "/7/8/9");
}
private static void mkdirs(String path) throws Exception {
FileSystem fileSystem = cluster.getFileSystem();
final Path qualifiedPath = new Path(path).makeQualified(fileSystem.getUri(),
@ -121,17 +133,31 @@ public class TestCopyMapper {
}
private static void touchFile(String path) throws Exception {
touchFile(path, false);
}
private static void touchFile(String path, boolean createMultipleBlocks) throws Exception {
final long NON_DEFAULT_BLOCK_SIZE = 4096;
FileSystem fs;
DataOutputStream outputStream = null;
try {
fs = cluster.getFileSystem();
final Path qualifiedPath = new Path(path).makeQualified(fs.getUri(),
fs.getWorkingDirectory());
final long blockSize = fs.getDefaultBlockSize(qualifiedPath) * 2;
final long blockSize = createMultipleBlocks? NON_DEFAULT_BLOCK_SIZE : fs.getDefaultBlockSize(qualifiedPath) * 2;
outputStream = fs.create(qualifiedPath, true, 0,
(short)(fs.getDefaultReplication(qualifiedPath)*2),
blockSize);
outputStream.write(new byte[FILE_SIZE]);
byte[] bytes = new byte[DEFAULT_FILE_SIZE];
outputStream.write(bytes);
long fileSize = DEFAULT_FILE_SIZE;
if (createMultipleBlocks) {
while (fileSize < 2*blockSize) {
outputStream.write(bytes);
outputStream.flush();
fileSize += DEFAULT_FILE_SIZE;
}
}
pathList.add(qualifiedPath);
++nFiles;
@ -144,7 +170,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testRun() {
try {
deleteState();
@ -179,7 +205,7 @@ public class TestCopyMapper {
Assert.assertEquals(pathList.size(),
stubContext.getReporter().getCounter(CopyMapper.Counter.COPY).getValue());
Assert.assertEquals(nFiles * FILE_SIZE,
Assert.assertEquals(nFiles * DEFAULT_FILE_SIZE,
stubContext.getReporter().getCounter(CopyMapper.Counter.BYTESCOPIED).getValue());
testCopyingExistingFiles(fs, copyMapper, context);
@ -211,7 +237,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testMakeDirFailure() {
try {
deleteState();
@ -239,13 +265,13 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testIgnoreFailures() {
doTestIgnoreFailures(true);
doTestIgnoreFailures(false);
}
@Test
@Test(timeout=40000)
public void testDirToFile() {
try {
deleteState();
@ -273,7 +299,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testPreserve() {
try {
deleteState();
@ -343,7 +369,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testCopyReadableFiles() {
try {
deleteState();
@ -406,7 +432,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testSkipCopyNoPerms() {
try {
deleteState();
@ -480,7 +506,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testFailCopyWithAccessControlException() {
try {
deleteState();
@ -563,7 +589,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testFileToDir() {
try {
deleteState();
@ -640,12 +666,48 @@ public class TestCopyMapper {
cluster.getFileSystem().delete(new Path(TARGET_PATH), true);
}
@Test
@Test(timeout=40000)
public void testPreserveBlockSizeAndReplication() {
testPreserveBlockSizeAndReplicationImpl(true);
testPreserveBlockSizeAndReplicationImpl(false);
}
@Test(timeout=40000)
public void testCopyFailOnBlockSizeDifference() {
try {
deleteState();
createSourceDataWithDifferentBlockSize();
FileSystem fs = cluster.getFileSystem();
CopyMapper copyMapper = new CopyMapper();
StubContext stubContext = new StubContext(getConfiguration(), null, 0);
Mapper<Text, FileStatus, Text, Text>.Context context
= stubContext.getContext();
Configuration configuration = context.getConfiguration();
EnumSet<DistCpOptions.FileAttribute> fileAttributes
= EnumSet.noneOf(DistCpOptions.FileAttribute.class);
configuration.set(DistCpOptionSwitch.PRESERVE_STATUS.getConfigLabel(),
DistCpUtils.packAttributes(fileAttributes));
copyMapper.setup(context);
for (Path path : pathList) {
final FileStatus fileStatus = fs.getFileStatus(path);
copyMapper.map(new Text(DistCpUtils.getRelativePath(new Path(SOURCE_PATH), path)),
fileStatus, context);
}
Assert.fail("Copy should have failed because of block-size difference.");
}
catch (Exception exception) {
// Check that the exception suggests the use of -pb/-skipCrc.
Assert.assertTrue("Failure exception should have suggested the use of -pb.", exception.getCause().getCause().getMessage().contains("pb"));
Assert.assertTrue("Failure exception should have suggested the use of -skipCrc.", exception.getCause().getCause().getMessage().contains("skipCrc"));
}
}
private void testPreserveBlockSizeAndReplicationImpl(boolean preserve){
try {
@ -717,7 +779,7 @@ public class TestCopyMapper {
* If a single file is being copied to a location where the file (of the same
* name) already exists, then the file shouldn't be skipped.
*/
@Test
@Test(timeout=40000)
public void testSingleFileCopy() {
try {
deleteState();
@ -766,7 +828,7 @@ public class TestCopyMapper {
}
}
@Test
@Test(timeout=40000)
public void testPreserveUserGroup() {
testPreserveUserGroupImpl(true);
testPreserveUserGroupImpl(false);