package org.apache.hadoop.hdfs.server.namenode;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Random;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
import org.apache.hadoop.hdfs.server.common.HdfsConstants;
import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.apache.hadoop.hdfs.server.namenode.FSImage.NameNodeDirType;
import org.apache.hadoop.hdfs.server.namenode.FSImage.NameNodeFile;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.util.StringUtils;
/**
* Startup and checkpoint tests
*
*/
public class TestStartup extends TestCase {
public static final String NAME_NODE_HOST = "localhost:";
public static final String NAME_NODE_HTTP_HOST = "0.0.0.0:";
private static final Log LOG =
LogFactory.getLog(TestStartup.class.getName());
private Configuration config;
private File hdfsDir=null;
static final long seed = 0xAAAAEEFL;
static final int blockSize = 4096;
static final int fileSize = 8192;
private long editsLength=0, fsimageLength=0;
private void writeFile(FileSystem fileSys, Path name, int repl)
throws IOException {
FSDataOutputStream stm = fileSys.create(name, true,
fileSys.getConf().getInt("io.file.buffer.size", 4096),
(short)repl, (long)blockSize);
byte[] buffer = new byte[fileSize];
Random rand = new Random(seed);
rand.nextBytes(buffer);
stm.write(buffer);
stm.close();
}
protected void setUp() throws Exception {
config = new Configuration();
String baseDir = System.getProperty("test.build.data", "/tmp");
hdfsDir = new File(baseDir, "dfs");
if ( hdfsDir.exists() && !FileUtil.fullyDelete(hdfsDir) ) {
throw new IOException("Could not delete hdfs directory '" + hdfsDir + "'");
}
LOG.info("--hdfsdir is " + hdfsDir.getAbsolutePath());
config.set("dfs.name.dir", new File(hdfsDir, "name").getPath());
config.set("dfs.data.dir", new File(hdfsDir, "data").getPath());
config.set("fs.checkpoint.dir",new File(hdfsDir, "secondary").getPath());
config.setInt("dfs.secondary.info.port", 0);
//config.set("fs.default.name", "hdfs://"+ NAME_NODE_HOST + "0");
FileSystem.setDefaultUri(config, "hdfs://"+NAME_NODE_HOST + "0");
}
/**
* clean up
*/
public void tearDown() throws Exception {
if ( hdfsDir.exists() && !FileUtil.fullyDelete(hdfsDir) ) {
throw new IOException("Could not delete hdfs directory in tearDown '" + hdfsDir + "'");
}
}
/**
* start MiniDFScluster, create a file (to create edits) and do a checkpoint
* @throws IOException
*/
public void createCheckPoint() throws IOException {
LOG.info("--starting mini cluster");
// manage dirs parameter set to false
MiniDFSCluster cluster = null;
SecondaryNameNode sn = null;
try {
cluster = new MiniDFSCluster(0, config, 1, true, false, false, null, null, null, null);
cluster.waitActive();
LOG.info("--starting Secondary Node");
// start secondary node
sn = new SecondaryNameNode(config);
assertNotNull(sn);
// create a file
FileSystem fileSys = cluster.getFileSystem();
Path file1 = new Path("t1");
this.writeFile(fileSys, file1, 1);
LOG.info("--doing checkpoint");
sn.doCheckpoint(); // this shouldn't fail
// do it twice since after fresh startup we're
// writing to edits.new
sn.doCheckpoint();
LOG.info("--done checkpoint");
} catch (IOException e) {
fail(StringUtils.stringifyException(e));
System.err.println("checkpoint failed");
throw e;
} finally {
if(sn!=null)
sn.shutdown();
if(cluster!=null)
cluster.shutdown();
LOG.info("--file t1 created, cluster shutdown");
}
}
/*
* corrupt files by removing and recreating the directory
*/
private void corruptNameNodeFiles() throws IOException {
// now corrupt/delete the directrory
List<File> nameDirs = (List<File>)FSNamesystem.getNamespaceDirs(config);
List<File> nameEditsDirs = (List<File>)FSNamesystem.getNamespaceEditsDirs(config);
// get name dir and its length, then delete and recreate the directory
File dir = nameDirs.get(0); // has only one
this.fsimageLength = new File(new File(dir, "current"),
NameNodeFile.IMAGE.getName()).length();
if(dir.exists() && !(FileUtil.fullyDelete(dir)))
throw new IOException("Cannot remove directory: " + dir);
LOG.info("--removed dir "+dir + ";len was ="+ this.fsimageLength);
if (!dir.mkdirs())
throw new IOException("Cannot create directory " + dir);
dir = nameEditsDirs.get(0); //has only one
this.editsLength = new File(new File(dir, "current"),
NameNodeFile.EDITS.getName()).length();
if(dir.exists() && !(FileUtil.fullyDelete(dir)))
throw new IOException("Cannot remove directory: " + dir);
if (!dir.mkdirs())
throw new IOException("Cannot create directory " + dir);
LOG.info("--removed dir and recreated "+dir + ";len was ="+ this.editsLength);
}
/**
* start with -importCheckpoint option and verify that the files are in separate directories and of the right length
* @throws IOException
*/
private void checkNameNodeFiles() throws IOException{
// start namenode with import option
LOG.info("-- about to start DFS cluster");
MiniDFSCluster cluster = null;
try {
cluster = new MiniDFSCluster(0, config, 1, false, false, false, StartupOption.IMPORT, null, null, null);
cluster.waitActive();
LOG.info("--NN started with checkpoint option");
NameNode nn = cluster.getNameNode();
assertNotNull(nn);
// Verify that image file sizes did not change.
FSImage image = nn.getFSImage();
verifyDifferentDirs(image, this.fsimageLength, this.editsLength);
} finally {
if(cluster != null)
cluster.shutdown();
}
}
/**
* verify that edits log and fsimage are in different directories and of a correct size
*/
private void verifyDifferentDirs(FSImage img, long expectedImgSize, long expectedEditsSize) {
StorageDirectory sd =null;
for (Iterator<StorageDirectory> it = img.dirIterator(); it.hasNext();) {
sd = it.next();
if(sd.getStorageDirType().isOfType(NameNodeDirType.IMAGE)) {
File imf = FSImage.getImageFile(sd, NameNodeFile.IMAGE);
LOG.info("--image file " + imf.getAbsolutePath() + "; len = " + imf.length() + "; expected = " + expectedImgSize);
assertEquals(expectedImgSize, imf.length());
} else if(sd.getStorageDirType().isOfType(NameNodeDirType.EDITS)) {
File edf = FSImage.getImageFile(sd, NameNodeFile.EDITS);
LOG.info("-- edits file " + edf.getAbsolutePath() + "; len = " + edf.length() + "; expected = " + expectedEditsSize);
assertEquals(expectedEditsSize, edf.length());
} else {
fail("Image/Edits directories are not different");
}
}
}
/**
* secnn-6
* checkpoint for edits and image is the same directory
* @throws IOException
*/
public void testChkpointStartup2() throws IOException{
LOG.info("--starting checkpointStartup2 - same directory for checkpoint");
// different name dirs
config.set("dfs.name.dir", new File(hdfsDir, "name").getPath());
config.set("dfs.name.edits.dir", new File(hdfsDir, "edits").getPath());
// same checkpoint dirs
config.set("fs.checkpoint.edits.dir", new File(hdfsDir, "chkpt").getPath());
config.set("fs.checkpoint.dir", new File(hdfsDir, "chkpt").getPath());
createCheckPoint();
corruptNameNodeFiles();
checkNameNodeFiles();
}
/**
* seccn-8
* checkpoint for edits and image are different directories
* @throws IOException
*/
public void testChkpointStartup1() throws IOException{
//setUpConfig();
LOG.info("--starting testStartup Recovery");
// different name dirs
config.set("dfs.name.dir", new File(hdfsDir, "name").getPath());
config.set("dfs.name.edits.dir", new File(hdfsDir, "edits").getPath());
// same checkpoint dirs
config.set("fs.checkpoint.edits.dir", new File(hdfsDir, "chkpt_edits").getPath());
config.set("fs.checkpoint.dir", new File(hdfsDir, "chkpt").getPath());
createCheckPoint();
corruptNameNodeFiles();
checkNameNodeFiles();
}
/**
* secnn-7
* secondary node copies fsimage and edits into correct separate directories.
* @throws IOException
*/
public void testSNNStartup() throws IOException{
//setUpConfig();
LOG.info("--starting SecondNN startup test");
// different name dirs
config.set("dfs.name.dir", new File(hdfsDir, "name").getPath());
config.set("dfs.name.edits.dir", new File(hdfsDir, "name").getPath());
// same checkpoint dirs
config.set("fs.checkpoint.edits.dir", new File(hdfsDir, "chkpt_edits").getPath());
config.set("fs.checkpoint.dir", new File(hdfsDir, "chkpt").getPath());
LOG.info("--starting NN ");
MiniDFSCluster cluster = null;
SecondaryNameNode sn = null;
NameNode nn = null;
try {
cluster = new MiniDFSCluster(0, config, 1, true, false, false, null, null, null, null);
cluster.waitActive();
nn = cluster.getNameNode();
assertNotNull(nn);
// start secondary node
LOG.info("--starting SecondNN");
sn = new SecondaryNameNode(config);
assertNotNull(sn);
LOG.info("--doing checkpoint");
sn.doCheckpoint(); // this shouldn't fail
LOG.info("--done checkpoint");
// now verify that image and edits are created in the different directories
FSImage image = nn.getFSImage();
StorageDirectory sd = image.getStorageDir(0); //only one
assertEquals(sd.getStorageDirType(), NameNodeDirType.IMAGE_AND_EDITS);
File imf = FSImage.getImageFile(sd, NameNodeFile.IMAGE);
File edf = FSImage.getImageFile(sd, NameNodeFile.EDITS);
LOG.info("--image file " + imf.getAbsolutePath() + "; len = " + imf.length());
LOG.info("--edits file " + edf.getAbsolutePath() + "; len = " + edf.length());
FSImage chkpImage = sn.getFSImage();
verifyDifferentDirs(chkpImage, imf.length(), edf.length());
} catch (IOException e) {
fail(StringUtils.stringifyException(e));
System.err.println("checkpoint failed");
throw e;
} finally {
if(sn!=null)
sn.shutdown();
if(cluster!=null)
cluster.shutdown();
}
}
public void testCompression() throws Exception {
LOG.info("Test compressing image.");
Configuration conf = new Configuration();
FileSystem.setDefaultUri(conf, "hdfs://localhost:0");
conf.set("dfs.http.address", "127.0.0.1:0");
File base_dir = new File(System.getProperty("test.build.data", "build/test/data"), "dfs/");
conf.set("dfs.name.dir", new File(base_dir, "name").getPath());
conf.setBoolean("dfs.permissions", false);
NameNode.format(conf);
// create an uncompressed image
LOG.info("Create an uncompressed fsimage");
NameNode namenode = new NameNode(conf);
namenode.getNamesystem().mkdirs("/test",
new PermissionStatus("hairong", null, FsPermission.getDefault()));
assertTrue(namenode.getFileInfo("/test").isDir());
namenode.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
namenode.saveNamespace(false, false);
namenode.stop();
namenode.join();
// compress image using default codec
LOG.info("Read an uncomressed image and store it compressed using default codec.");
conf.setBoolean(HdfsConstants.DFS_IMAGE_COMPRESS_KEY, true);
checkNameSpace(conf);
// read image compressed using the default codec and compress it using Gzip codec
LOG.info("Read a compressed image and store it using a different codec.");
conf.set(HdfsConstants.DFS_IMAGE_COMPRESSION_CODEC_KEY,
"org.apache.hadoop.io.compress.GzipCodec");
checkNameSpace(conf);
// read an image compressed in Gzip and store it uncompressed
LOG.info("Read an compressed iamge and store it as uncompressed.");
conf.setBoolean(HdfsConstants.DFS_IMAGE_COMPRESS_KEY, false);
checkNameSpace(conf);
// read an uncomrpessed image and store it uncompressed
LOG.info("Read an uncompressed image and store it as uncompressed.");
checkNameSpace(conf);
}
private void checkNameSpace(Configuration conf) throws IOException {
NameNode namenode = new NameNode(conf);
assertTrue(namenode.getFileInfo("/test").isDir());
namenode.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
namenode.saveNamespace(false, false);
namenode.stop();
namenode.join();
}
public void testImageChecksum() throws Exception {
LOG.info("Test uncompressed image checksum");
testImageChecksum(false);
LOG.info("Test compressed image checksum");
testImageChecksum(true);
}
private void testImageChecksum(boolean compress) throws Exception {
Configuration conf = new Configuration();
FileSystem.setDefaultUri(conf, "hdfs://localhost:0");
conf.set("dfs.http.address", "127.0.0.1:0");
File base_dir = new File(
System.getProperty("test.build.data", "build/test/data"), "dfs/");
conf.set("dfs.name.dir", new File(base_dir, "name").getPath());
conf.setBoolean("dfs.permissions", false);
if (compress) {
conf.setBoolean(HdfsConstants.DFS_IMAGE_COMPRESS_KEY, true);
}
NameNode.format(conf);
// create an image
LOG.info("Create an fsimage");
NameNode namenode = new NameNode(conf);
namenode.getNamesystem().mkdirs("/test",
new PermissionStatus("hairong", null, FsPermission.getDefault()));
assertTrue(namenode.getFileInfo("/test").isDir());
namenode.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
namenode.saveNamespace();
FSImage image = namenode.getFSImage();
image.loadFSImage();
File versionFile = image.getStorageDir(0).getVersionFile();
RandomAccessFile file = new RandomAccessFile(versionFile, "rws");
FileInputStream in = null;
FileOutputStream out = null;
try {
// read the property from version file
in = new FileInputStream(file.getFD());
file.seek(0);
Properties props = new Properties();
props.load(in);
// get the MD5 property and change it
String sMd5 = props.getProperty(FSImage.MESSAGE_DIGEST_PROPERTY);
MD5Hash md5 = new MD5Hash(sMd5);
byte[] bytes = md5.getDigest();
bytes[0] += 1;
md5 = new MD5Hash(bytes);
props.setProperty(FSImage.MESSAGE_DIGEST_PROPERTY, md5.toString());
// write the properties back to version file
file.seek(0);
out = new FileOutputStream(file.getFD());
props.store(out, null);
out.flush();
file.setLength(out.getChannel().position());
// now load the image again
image.loadFSImage();
fail("Expect to get a checksumerror");
} catch(IOException e) {
assertTrue(e.getMessage().endsWith("is corrupt!"));
} finally {
IOUtils.closeStream(in);
IOUtils.closeStream(out);
namenode.stop();
namenode.join();
}
}
}