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apache / hadoop / 1d0c9ab4330e87c73e8473bee9c1d4b6db2fd5fd / . / hadoop-hdfs-project / hadoop-hdfs / src / test / java / org / apache / hadoop / hdfs / server / namenode / TestCheckpoint.java
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/**
* 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.namenode;
import static org.apache.hadoop.hdfs.server.common.Util.fileAsURI;
import static org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil.assertNNHasCheckpoints;
import static org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil.getNameNodeCurrentDirs;
import static org.apache.hadoop.hdfs.server.namenode.ImageServlet.RECENT_IMAGE_CHECK_ENABLED;
import static org.apache.hadoop.test.MetricsAsserts.assertCounterGt;
import static org.apache.hadoop.test.MetricsAsserts.assertGaugeGt;
import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.lang.management.ManagementFactory;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Supplier;
import org.apache.commons.cli.ParseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.apache.hadoop.hdfs.server.common.StorageInfo;
import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile;
import org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.CheckpointStorage;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
import org.apache.hadoop.hdfs.tools.DFSAdmin;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.GenericTestUtils.DelayAnswer;
import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
import org.apache.hadoop.test.PathUtils;
import org.apache.hadoop.util.ExitUtil;
import org.apache.hadoop.util.ExitUtil.ExitException;
import org.apache.hadoop.util.Lists;
import org.apache.hadoop.util.StringUtils;
import org.slf4j.event.Level;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.apache.hadoop.thirdparty.com.google.common.base.Joiner;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableSet;
import org.apache.hadoop.thirdparty.com.google.common.primitives.Ints;
/**
* This class tests the creation and validation of a checkpoint.
*/
public class TestCheckpoint {
static {
GenericTestUtils.setLogLevel(FSImage.LOG, Level.TRACE);
}
static final Logger LOG = LoggerFactory.getLogger(TestCheckpoint.class);
static final String NN_METRICS = "NameNodeActivity";
static final long seed = 0xDEADBEEFL;
static final int blockSize = 4096;
static final int fileSize = 8192;
static final int numDatanodes = 3;
short replication = 3;
static final FilenameFilter tmpEditsFilter = new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.startsWith(NameNodeFile.EDITS_TMP.getName());
}
};
private CheckpointFaultInjector faultInjector;
@Before
public void setUp() {
FileUtil.fullyDeleteContents(new File(MiniDFSCluster.getBaseDirectory()));
faultInjector = Mockito.mock(CheckpointFaultInjector.class);
CheckpointFaultInjector.instance = faultInjector;
}
@After
public void checkForSNNThreads() {
GenericTestUtils.assertNoThreadsMatching(".*SecondaryNameNode.*");
}
static void checkFile(FileSystem fileSys, Path name, int repl)
throws IOException {
assertTrue(fileSys.exists(name));
int replication = fileSys.getFileStatus(name).getReplication();
assertEquals("replication for " + name, repl, replication);
//We should probably test for more of the file properties.
}
static void cleanupFile(FileSystem fileSys, Path name)
throws IOException {
assertTrue(fileSys.exists(name));
fileSys.delete(name, true);
assertTrue(!fileSys.exists(name));
}
/*
* Verify that namenode does not startup if one namedir is bad.
*/
@Test
public void testNameDirError() throws IOException {
LOG.info("Starting testNameDirError");
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.build();
Collection<URI> nameDirs = cluster.getNameDirs(0);
cluster.shutdown();
cluster = null;
for (URI nameDirUri : nameDirs) {
File dir = new File(nameDirUri.getPath());
try {
// Simulate the mount going read-only
FileUtil.setWritable(dir, false);
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(false).build();
fail("NN should have failed to start with " + dir + " set unreadable");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"storage directory does not exist or is not accessible", ioe);
} finally {
cleanup(cluster);
cluster = null;
FileUtil.setWritable(dir, true);
}
}
}
/**
* Checks that an IOException in NNStorage.writeTransactionIdFile is handled
* correctly (by removing the storage directory)
* See https://issues.apache.org/jira/browse/HDFS-2011
*/
@Test
public void testWriteTransactionIdHandlesIOE() throws Exception {
LOG.info("Check IOException handled correctly by writeTransactionIdFile");
ArrayList<URI> fsImageDirs = new ArrayList<URI>();
ArrayList<URI> editsDirs = new ArrayList<URI>();
File filePath =
new File(PathUtils.getTestDir(getClass()), "storageDirToCheck");
assertTrue("Couldn't create directory storageDirToCheck",
filePath.exists() || filePath.mkdirs());
fsImageDirs.add(filePath.toURI());
editsDirs.add(filePath.toURI());
NNStorage nnStorage = new NNStorage(new HdfsConfiguration(),
fsImageDirs, editsDirs);
try {
assertTrue("List of storage directories didn't have storageDirToCheck.",
nnStorage.getEditsDirectories().iterator().next().
toString().indexOf("storageDirToCheck") != -1);
assertTrue("List of removed storage directories wasn't empty",
nnStorage.getRemovedStorageDirs().isEmpty());
} finally {
// Delete storage directory to cause IOException in writeTransactionIdFile
assertTrue("Couldn't remove directory " + filePath.getAbsolutePath(),
filePath.delete());
}
// Just call writeTransactionIdFile using any random number
nnStorage.writeTransactionIdFileToStorage(1);
List<StorageDirectory> listRsd = nnStorage.getRemovedStorageDirs();
assertTrue("Removed directory wasn't what was expected",
listRsd.size() > 0 && listRsd.get(listRsd.size() - 1).getRoot().
toString().indexOf("storageDirToCheck") != -1);
nnStorage.close();
}
/*
* Simulate exception during edit replay.
*/
@Test(timeout=30000)
public void testReloadOnEditReplayFailure () throws IOException {
Configuration conf = new HdfsConfiguration();
FSDataOutputStream fos = null;
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fs = cluster.getFileSystem();
secondary = startSecondaryNameNode(conf);
fos = fs.create(new Path("tmpfile0"));
fos.write(new byte[] { 0, 1, 2, 3 });
secondary.doCheckpoint();
fos.write(new byte[] { 0, 1, 2, 3 });
fos.hsync();
// Cause merge to fail in next checkpoint.
Mockito.doThrow(new IOException(
"Injecting failure during merge"))
.when(faultInjector).duringMerge();
try {
secondary.doCheckpoint();
fail("Fault injection failed.");
} catch (IOException ioe) {
// This is expected.
}
Mockito.reset(faultInjector);
// The error must be recorded, so next checkpoint will reload image.
fos.write(new byte[] { 0, 1, 2, 3 });
fos.hsync();
assertTrue("Another checkpoint should have reloaded image",
secondary.doCheckpoint());
} finally {
if (fs != null) {
fs.close();
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
Mockito.reset(faultInjector);
}
}
/*
* Simulate 2NN exit due to too many merge failures.
*/
@Test(timeout=30000)
public void testTooManyEditReplayFailures() throws IOException {
Configuration conf = new HdfsConfiguration();
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_MAX_RETRIES_KEY, 1);
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_PERIOD_KEY, 1);
FSDataOutputStream fos = null;
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.checkExitOnShutdown(false).build();
cluster.waitActive();
fs = cluster.getFileSystem();
fos = fs.create(new Path("tmpfile0"));
fos.write(new byte[] { 0, 1, 2, 3 });
// Cause merge to fail in next checkpoint.
Mockito.doThrow(new IOException(
"Injecting failure during merge"))
.when(faultInjector).duringMerge();
secondary = startSecondaryNameNode(conf);
secondary.doWork();
// Fail if we get here.
fail("2NN did not exit.");
} catch (ExitException ee) {
// ignore
ExitUtil.resetFirstExitException();
assertEquals("Max retries", 1, secondary.getMergeErrorCount() - 1);
} finally {
if (fs != null) {
fs.close();
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
Mockito.reset(faultInjector);
}
}
/*
* Simulate namenode crashing after rolling edit log.
*/
@Test
public void testSecondaryNamenodeError1()
throws IOException {
LOG.info("Starting testSecondaryNamenodeError1");
Configuration conf = new HdfsConfiguration();
Path file1 = new Path("checkpointxx.dat");
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
assertTrue(!fileSys.exists(file1));
// Make the checkpoint fail after rolling the edits log.
secondary = startSecondaryNameNode(conf);
Mockito.doThrow(new IOException(
"Injecting failure after rolling edit logs"))
.when(faultInjector).afterSecondaryCallsRollEditLog();
try {
secondary.doCheckpoint(); // this should fail
assertTrue(false);
} catch (IOException e) {
// expected
}
Mockito.reset(faultInjector);
//
// Create a new file
//
DFSTestUtil.createFile(fileSys, file1, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file1, replication);
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
//
// Restart cluster and verify that file exists.
// Then take another checkpoint to verify that the
// namenode restart accounted for the rolled edit logs.
//
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(false).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
checkFile(fileSys, file1, replication);
cleanupFile(fileSys, file1);
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint();
secondary.shutdown();
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/*
* Simulate a namenode crash after uploading new image
*/
@Test
public void testSecondaryNamenodeError2() throws IOException {
LOG.info("Starting testSecondaryNamenodeError2");
Configuration conf = new HdfsConfiguration();
Path file1 = new Path("checkpointyy.dat");
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
assertTrue(!fileSys.exists(file1));
//
// Make the checkpoint fail after uploading the new fsimage.
//
secondary = startSecondaryNameNode(conf);
Mockito.doThrow(new IOException(
"Injecting failure after uploading new image"))
.when(faultInjector).afterSecondaryUploadsNewImage();
try {
secondary.doCheckpoint(); // this should fail
assertTrue(false);
} catch (IOException e) {
// expected
}
Mockito.reset(faultInjector);
//
// Create a new file
//
DFSTestUtil.createFile(fileSys, file1, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file1, replication);
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
//
// Restart cluster and verify that file exists.
// Then take another checkpoint to verify that the
// namenode restart accounted for the rolled edit logs.
//
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(false).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
checkFile(fileSys, file1, replication);
cleanupFile(fileSys, file1);
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint();
secondary.shutdown();
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/*
* Simulate a secondary namenode crash after rolling the edit log.
*/
@Test
public void testSecondaryNamenodeError3() throws IOException {
LOG.info("Starting testSecondaryNamenodeError3");
Configuration conf = new HdfsConfiguration();
Path file1 = new Path("checkpointzz.dat");
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
assertTrue(!fileSys.exists(file1));
//
// Make the checkpoint fail after rolling the edit log.
//
secondary = startSecondaryNameNode(conf);
Mockito.doThrow(new IOException(
"Injecting failure after rolling edit logs"))
.when(faultInjector).afterSecondaryCallsRollEditLog();
try {
secondary.doCheckpoint(); // this should fail
assertTrue(false);
} catch (IOException e) {
// expected
}
Mockito.reset(faultInjector);
secondary.shutdown(); // secondary namenode crash!
// start new instance of secondary and verify that
// a new rollEditLog succeeds inspite of the fact that
// edits.new already exists.
//
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint(); // this should work correctly
//
// Create a new file
//
DFSTestUtil.createFile(fileSys, file1, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file1, replication);
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
//
// Restart cluster and verify that file exists.
// Then take another checkpoint to verify that the
// namenode restart accounted for the twice-rolled edit logs.
//
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(false).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
checkFile(fileSys, file1, replication);
cleanupFile(fileSys, file1);
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint();
secondary.shutdown();
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Simulate a secondary node failure to transfer image. Uses an unchecked
* error and fail transfer before even setting the length header. This used to
* cause image truncation. Regression test for HDFS-3330.
*/
@Test
public void testSecondaryFailsWithErrorBeforeSettingHeaders()
throws IOException {
Mockito.doThrow(new Error("If this exception is not caught by the " +
"name-node, fs image will be truncated."))
.when(faultInjector).beforeGetImageSetsHeaders();
doSecondaryFailsToReturnImage();
}
private void doSecondaryFailsToReturnImage() throws IOException {
LOG.info("Starting testSecondaryFailsToReturnImage");
Configuration conf = new HdfsConfiguration();
Path file1 = new Path("checkpointRI.dat");
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
FSImage image = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
image = cluster.getNameNode().getFSImage();
assertTrue(!fileSys.exists(file1));
StorageDirectory sd = image.getStorage().getStorageDir(0);
File latestImageBeforeCheckpoint = FSImageTestUtil.findLatestImageFile(sd);
long fsimageLength = latestImageBeforeCheckpoint.length();
//
// Make the checkpoint
//
secondary = startSecondaryNameNode(conf);
try {
secondary.doCheckpoint(); // this should fail
fail("Checkpoint succeeded even though we injected an error!");
} catch (IOException e) {
// check that it's the injected exception
GenericTestUtils.assertExceptionContains(
"If this exception is not caught", e);
}
Mockito.reset(faultInjector);
// Verify that image file sizes did not change.
for (StorageDirectory sd2 :
image.getStorage().dirIterable(NameNodeDirType.IMAGE)) {
File thisNewestImage = FSImageTestUtil.findLatestImageFile(sd2);
long len = thisNewestImage.length();
assertEquals(fsimageLength, len);
}
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
private File filePathContaining(final String substring) {
return Mockito.argThat(arg -> arg.getAbsolutePath().contains(substring));
}
private void checkTempImages(NNStorage storage) throws IOException {
List<File> dirs = new ArrayList<File>();
dirs.add(storage.getStorageDir(0).getCurrentDir());
dirs.add(storage.getStorageDir(1).getCurrentDir());
for (File dir : dirs) {
File[] list = dir.listFiles();
for (File f : list) {
// Throw an exception if a temp image file is found.
if(f.getName().contains(NNStorage.NameNodeFile.IMAGE_NEW.getName())) {
throw new IOException("Found " + f);
}
}
}
}
/**
* Simulate 2NN failing to send the whole file (error type 3)
* The length header in the HTTP transfer should prevent
* this from corrupting the NN.
*/
@Test
public void testNameNodeImageSendFailWrongSize()
throws IOException {
LOG.info("Starting testNameNodeImageSendFailWrongSize");
Mockito.doReturn(true).when(faultInjector)
.shouldSendShortFile(filePathContaining("fsimage"));
doSendFailTest("is not of the advertised size");
}
/**
* Simulate 2NN sending a corrupt image (error type 4)
* The digest header in the HTTP transfer should prevent
* this from corrupting the NN.
*/
@Test
public void testNameNodeImageSendFailWrongDigest()
throws IOException {
LOG.info("Starting testNameNodeImageSendFailWrongDigest");
Mockito.doReturn(true).when(faultInjector)
.shouldCorruptAByte(Mockito.any(File.class));
doSendFailTest("does not match advertised digest");
}
/**
* Run a test where the 2NN runs into some kind of error when
* sending the checkpoint back to the NN.
* @param exceptionSubstring an expected substring of the triggered exception
*/
private void doSendFailTest(String exceptionSubstring)
throws IOException {
Configuration conf = new HdfsConfiguration();
Path file1 = new Path("checkpoint-doSendFailTest-doSendFailTest.dat");
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
assertTrue(!fileSys.exists(file1));
//
// Make the checkpoint fail after rolling the edit log.
//
secondary = startSecondaryNameNode(conf);
try {
secondary.doCheckpoint(); // this should fail
fail("Did not get expected exception");
} catch (IOException e) {
// We only sent part of the image. Have to trigger this exception
GenericTestUtils.assertExceptionContains(exceptionSubstring, e);
}
Mockito.reset(faultInjector);
// Make sure there is no temporary files left around.
checkTempImages(cluster.getNameNode().getFSImage().getStorage());
checkTempImages(secondary.getFSImage().getStorage());
secondary.shutdown(); // secondary namenode crash!
secondary = null;
// start new instance of secondary and verify that
// a new rollEditLog succedes in spite of the fact that we had
// a partially failed checkpoint previously.
//
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint(); // this should work correctly
//
// Create a new file
//
DFSTestUtil.createFile(fileSys, file1, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file1, replication);
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test that the NN locks its storage and edits directories, and won't start up
* if the directories are already locked
**/
@Test
public void testNameDirLocking() throws IOException {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
// Start a NN, and verify that lock() fails in all of the configured
// directories
StorageDirectory savedSd = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
for (StorageDirectory sd : storage.dirIterable(null)) {
assertLockFails(sd);
savedSd = sd;
}
} finally {
cleanup(cluster);
cluster = null;
}
assertNotNull(savedSd);
// Lock one of the saved directories, then start the NN, and make sure it
// fails to start
assertClusterStartFailsWhenDirLocked(conf, savedSd);
}
/**
* Test that, if the edits dir is separate from the name dir, it is
* properly locked.
**/
@Test
public void testSeparateEditsDirLocking() throws IOException {
Configuration conf = new HdfsConfiguration();
File nameDir = new File(MiniDFSCluster.getBaseDirectory(), "name");
File editsDir = new File(MiniDFSCluster.getBaseDirectory(),
"testSeparateEditsDirLocking");
conf.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY,
nameDir.getAbsolutePath());
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
editsDir.getAbsolutePath());
MiniDFSCluster cluster = null;
// Start a NN, and verify that lock() fails in all of the configured
// directories
StorageDirectory savedSd = null;
try {
cluster = new MiniDFSCluster.Builder(conf).manageNameDfsDirs(false)
.numDataNodes(0).build();
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
for (StorageDirectory sd : storage.dirIterable(NameNodeDirType.EDITS)) {
assertEquals(editsDir.getAbsoluteFile(), sd.getRoot());
assertLockFails(sd);
savedSd = sd;
}
} finally {
cleanup(cluster);
cluster = null;
}
assertNotNull(savedSd);
// Lock one of the saved directories, then start the NN, and make sure it
// fails to start
assertClusterStartFailsWhenDirLocked(conf, savedSd);
}
/**
* Test that the SecondaryNameNode properly locks its storage directories.
*/
@Test
public void testSecondaryNameNodeLocking() throws Exception {
// Start a primary NN so that the secondary will start successfully
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
StorageDirectory savedSd = null;
// Start a secondary NN, then make sure that all of its storage
// dirs got locked.
secondary = startSecondaryNameNode(conf);
NNStorage storage = secondary.getFSImage().getStorage();
for (StorageDirectory sd : storage.dirIterable(null)) {
assertLockFails(sd);
savedSd = sd;
}
LOG.info("===> Shutting down first 2NN");
secondary.shutdown();
secondary = null;
LOG.info("===> Locking a dir, starting second 2NN");
// Lock one of its dirs, make sure it fails to start
LOG.info("Trying to lock" + savedSd);
savedSd.lock();
try {
secondary = startSecondaryNameNode(conf);
assertFalse("Should fail to start 2NN when " + savedSd + " is locked",
savedSd.isLockSupported());
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains("already locked", ioe);
} finally {
savedSd.unlock();
}
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test that, an attempt to lock a storage that is already locked by nodename,
* logs error message that includes JVM name of the namenode that locked it.
*/
@Test
public void testStorageAlreadyLockedErrorMessage() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
StorageDirectory savedSd = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
for (StorageDirectory sd : storage.dirIterable(null)) {
assertLockFails(sd);
savedSd = sd;
}
LogCapturer logs = GenericTestUtils.LogCapturer.captureLogs(
LoggerFactory.getLogger(Storage.class));
try {
// try to lock the storage that's already locked
savedSd.lock();
fail("Namenode should not be able to lock a storage" +
" that is already locked");
} catch (IOException ioe) {
// cannot read lock file on Windows, so message cannot get JVM name
String lockingJvmName = Path.WINDOWS ? "" :
" " + ManagementFactory.getRuntimeMXBean().getName();
String expectedLogMessage = "It appears that another node "
+ lockingJvmName + " has already locked the storage directory";
assertTrue("Log output does not contain expected log message: "
+ expectedLogMessage, logs.getOutput().contains(expectedLogMessage));
}
} finally {
cleanup(cluster);
cluster = null;
}
}
/**
* Assert that the given storage directory can't be locked, because
* it's already locked.
*/
private static void assertLockFails(StorageDirectory sd) {
try {
sd.lock();
// If the above line didn't throw an exception, then
// locking must not be supported
assertFalse(sd.isLockSupported());
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains("already locked", ioe);
}
}
/**
* Assert that, if sdToLock is locked, the cluster is not allowed to start up.
* @param conf cluster conf to use
* @param sdToLock the storage directory to lock
*/
private static void assertClusterStartFailsWhenDirLocked(
Configuration conf, StorageDirectory sdToLock) throws IOException {
// Lock the edits dir, then start the NN, and make sure it fails to start
sdToLock.lock();
MiniDFSCluster cluster = null;
try {
cluster = new MiniDFSCluster.Builder(conf).format(false)
.manageNameDfsDirs(false).numDataNodes(0).build();
assertFalse("cluster should fail to start after locking " +
sdToLock, sdToLock.isLockSupported());
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains("already locked", ioe);
} finally {
cleanup(cluster);
cluster = null;
sdToLock.unlock();
}
}
/**
* Test the importCheckpoint startup option. Verifies:
* 1. if the NN already contains an image, it will not be allowed
* to import a checkpoint.
* 2. if the NN does not contain an image, importing a checkpoint
* succeeds and re-saves the image
*/
@Test
public void testImportCheckpoint() throws Exception {
Configuration conf = new HdfsConfiguration();
Path testPath = new Path("/testfile");
SecondaryNameNode snn = null;
MiniDFSCluster cluster = null;
Collection<URI> nameDirs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
nameDirs = cluster.getNameDirs(0);
// Make an entry in the namespace, used for verifying checkpoint
// later.
cluster.getFileSystem().mkdirs(testPath);
// Take a checkpoint
snn = startSecondaryNameNode(conf);
snn.doCheckpoint();
} finally {
cleanup(snn);
cleanup(cluster);
cluster = null;
}
LOG.info("Trying to import checkpoint when the NameNode already " +
"contains an image. This should fail.");
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(false)
.startupOption(StartupOption.IMPORT).build();
fail("NameNode did not fail to start when it already contained " +
"an image");
} catch (IOException ioe) {
// Expected
GenericTestUtils.assertExceptionContains(
"NameNode already contains an image", ioe);
} finally {
cleanup(cluster);
cluster = null;
}
LOG.info("Removing NN storage contents");
for(URI uri : nameDirs) {
File dir = new File(uri.getPath());
LOG.info("Cleaning " + dir);
removeAndRecreateDir(dir);
}
LOG.info("Trying to import checkpoint");
try {
cluster = new MiniDFSCluster.Builder(conf).format(false).numDataNodes(0)
.startupOption(StartupOption.IMPORT).build();
assertTrue("Path from checkpoint should exist after import",
cluster.getFileSystem().exists(testPath));
// Make sure that the image got saved on import
FSImageTestUtil.assertNNHasCheckpoints(cluster, Ints.asList(3));
} finally {
cleanup(cluster);
cluster = null;
}
}
private static void removeAndRecreateDir(File dir) throws IOException {
if(dir.exists())
if(!(FileUtil.fullyDelete(dir)))
throw new IOException("Cannot remove directory: " + dir);
if (!dir.mkdirs())
throw new IOException("Cannot create directory " + dir);
}
SecondaryNameNode startSecondaryNameNode(Configuration conf
) throws IOException {
conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
return new SecondaryNameNode(conf);
}
SecondaryNameNode startSecondaryNameNode(Configuration conf, int index)
throws IOException {
Configuration snnConf = new Configuration(conf);
snnConf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
snnConf.set(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_DIR_KEY,
MiniDFSCluster.getBaseDirectory() + "/2nn-" + index);
return new SecondaryNameNode(snnConf);
}
/**
* Tests checkpoint in HDFS.
*/
@Test
public void testCheckpoint() throws IOException {
Path tmpDir = new Path("/tmp_tmp");
Path file1 = new Path("checkpoint.dat");
Path file2 = new Path("checkpoint2.dat");
Configuration conf = new HdfsConfiguration();
conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
replication = (short)conf.getInt(DFSConfigKeys.DFS_REPLICATION_KEY, 3);
MiniDFSCluster cluster = null;
FileSystem fileSys = null;
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(
numDatanodes).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
//
// verify that 'format' really blew away all pre-existing files
//
assertTrue(!fileSys.exists(file1));
assertTrue(!fileSys.exists(file2));
//
// Create file1
//
DFSTestUtil.createFile(fileSys, file1, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file1, replication);
for(int i=0; i < 1000; i++) {
fileSys.mkdirs(tmpDir);
fileSys.delete(tmpDir, true);
}
//
// Take a checkpoint
//
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint();
MetricsRecordBuilder rb = getMetrics(NN_METRICS);
assertCounterGt("GetImageNumOps", 0, rb);
assertCounterGt("GetEditNumOps", 0, rb);
assertCounterGt("PutImageNumOps", 0, rb);
assertGaugeGt("GetImageAvgTime", 0.0, rb);
assertGaugeGt("GetEditAvgTime", 0.0, rb);
assertGaugeGt("PutImageAvgTime", 0.0, rb);
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
//
// Restart cluster and verify that file1 still exist.
//
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(false).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
// check that file1 still exists
checkFile(fileSys, file1, replication);
cleanupFile(fileSys, file1);
// create new file file2
DFSTestUtil.createFile(fileSys, file2, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fileSys, file2, replication);
//
// Take a checkpoint
//
secondary = startSecondaryNameNode(conf);
secondary.doCheckpoint();
FSDirectory secondaryFsDir = secondary.getFSNamesystem().dir;
INode rootInMap = secondaryFsDir.getInode(secondaryFsDir.rootDir.getId());
assertSame(rootInMap, secondaryFsDir.rootDir);
fileSys.delete(tmpDir, true);
fileSys.mkdirs(tmpDir);
secondary.doCheckpoint();
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
//
// Restart cluster and verify that file2 exists and
// file1 does not exist.
//
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).format(false).build();
cluster.waitActive();
fileSys = cluster.getFileSystem();
assertTrue(!fileSys.exists(file1));
assertTrue(fileSys.exists(tmpDir));
try {
// verify that file2 exists
checkFile(fileSys, file2, replication);
} finally {
fileSys.close();
cluster.shutdown();
cluster = null;
}
}
/**
* Tests save namespace.
*/
@Test
@SuppressWarnings("deprecation")
public void testSaveNamespace() throws IOException {
MiniDFSCluster cluster = null;
DistributedFileSystem fs = null;
FileContext fc;
try {
Configuration conf = new HdfsConfiguration();
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).format(true).build();
cluster.waitActive();
fs = (cluster.getFileSystem());
fc = FileContext.getFileContext(cluster.getURI(0));
// Saving image without safe mode should fail
DFSAdmin admin = new DFSAdmin(conf);
String[] args = new String[]{"-saveNamespace"};
try {
admin.run(args);
} catch(Exception e) {
throw new IOException(e);
}
// create new file
Path file = new Path("namespace.dat");
DFSTestUtil.createFile(fs, file, fileSize, fileSize, blockSize,
replication, seed);
checkFile(fs, file, replication);
// create new link
Path symlink = new Path("file.link");
fc.createSymlink(file, symlink, false);
assertTrue(fc.getFileLinkStatus(symlink).isSymlink());
// verify that the edits file is NOT empty
Collection<URI> editsDirs = cluster.getNameEditsDirs(0);
for(URI uri : editsDirs) {
File ed = new File(uri.getPath());
assertTrue(new File(ed, "current/"
+ NNStorage.getInProgressEditsFileName(1))
.length() > Integer.SIZE/Byte.SIZE);
}
// Saving image in safe mode should succeed
fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
try {
admin.run(args);
} catch(Exception e) {
throw new IOException(e);
}
// TODO: Fix the test to not require a hard-coded transaction count.
final int EXPECTED_TXNS_FIRST_SEG = 13;
// the following steps should have happened:
// edits_inprogress_1 -> edits_1-12 (finalized)
// fsimage_12 created
// edits_inprogress_13 created
//
for(URI uri : editsDirs) {
File ed = new File(uri.getPath());
File curDir = new File(ed, "current");
LOG.info("Files in " + curDir + ":\n " +
Joiner.on("\n ").join(curDir.list()));
// Verify that the first edits file got finalized
File originalEdits = new File(curDir,
NNStorage.getInProgressEditsFileName(1));
assertFalse(originalEdits.exists());
File finalizedEdits = new File(curDir,
NNStorage.getFinalizedEditsFileName(1, EXPECTED_TXNS_FIRST_SEG));
GenericTestUtils.assertExists(finalizedEdits);
assertTrue(finalizedEdits.length() > Integer.SIZE/Byte.SIZE);
GenericTestUtils.assertExists(new File(ed, "current/"
+ NNStorage.getInProgressEditsFileName(
EXPECTED_TXNS_FIRST_SEG + 1)));
}
Collection<URI> imageDirs = cluster.getNameDirs(0);
for (URI uri : imageDirs) {
File imageDir = new File(uri.getPath());
File savedImage = new File(imageDir, "current/"
+ NNStorage.getImageFileName(
EXPECTED_TXNS_FIRST_SEG));
assertTrue("Should have saved image at " + savedImage,
savedImage.exists());
}
// restart cluster and verify file exists
cluster.shutdown();
cluster = null;
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).format(false).build();
cluster.waitActive();
fs = (cluster.getFileSystem());
checkFile(fs, file, replication);
fc = FileContext.getFileContext(cluster.getURI(0));
assertTrue(fc.getFileLinkStatus(symlink).isSymlink());
} finally {
if(fs != null) fs.close();
cleanup(cluster);
cluster = null;
}
}
/* Test case to test CheckpointSignature */
@Test
public void testCheckpointSignature() throws IOException {
MiniDFSCluster cluster = null;
Configuration conf = new HdfsConfiguration();
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(true).build();
NameNode nn = cluster.getNameNode();
NamenodeProtocols nnRpc = nn.getRpcServer();
secondary = startSecondaryNameNode(conf);
// prepare checkpoint image
secondary.doCheckpoint();
CheckpointSignature sig = nnRpc.rollEditLog();
// manipulate the CheckpointSignature fields
sig.setBlockpoolID("somerandomebpid");
sig.clusterID = "somerandomcid";
try {
sig.validateStorageInfo(nn.getFSImage()); // this should fail
assertTrue("This test is expected to fail.", false);
} catch (Exception ignored) {
}
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Tests the following sequence of events:
* - secondary successfully makes a checkpoint
* - it then fails while trying to upload it
* - it then fails again for the same reason
* - it then tries to checkpoint a third time
*/
@Test
public void testCheckpointAfterTwoFailedUploads() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(true).build();
secondary = startSecondaryNameNode(conf);
Mockito.doThrow(new IOException(
"Injecting failure after rolling edit logs"))
.when(faultInjector).afterSecondaryCallsRollEditLog();
// Fail to checkpoint once
try {
secondary.doCheckpoint();
fail("Should have failed upload");
} catch (IOException ioe) {
LOG.info("Got expected failure", ioe);
assertTrue(ioe.toString().contains("Injecting failure"));
}
// Fail to checkpoint again
try {
secondary.doCheckpoint();
fail("Should have failed upload");
} catch (IOException ioe) {
LOG.info("Got expected failure", ioe);
assertTrue(ioe.toString().contains("Injecting failure"));
} finally {
Mockito.reset(faultInjector);
}
// Now with the cleared error simulation, it should succeed
secondary.doCheckpoint();
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Starts two namenodes and two secondary namenodes, verifies that secondary
* namenodes are configured correctly to talk to their respective namenodes
* and can do the checkpoint.
*
* @throws IOException
*/
@Test
public void testMultipleSecondaryNamenodes() throws IOException {
Configuration conf = new HdfsConfiguration();
String nameserviceId1 = "ns1";
String nameserviceId2 = "ns2";
conf.set(DFSConfigKeys.DFS_NAMESERVICES, nameserviceId1
+ "," + nameserviceId2);
MiniDFSCluster cluster = null;
SecondaryNameNode secondary1 = null;
SecondaryNameNode secondary2 = null;
try {
cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(MiniDFSNNTopology.simpleFederatedTopology(
conf.get(DFSConfigKeys.DFS_NAMESERVICES)))
.build();
Configuration snConf1 = new HdfsConfiguration(cluster.getConfiguration(0));
Configuration snConf2 = new HdfsConfiguration(cluster.getConfiguration(1));
InetSocketAddress nn1RpcAddress = cluster.getNameNode(0)
.getNameNodeAddress();
InetSocketAddress nn2RpcAddress = cluster.getNameNode(1)
.getNameNodeAddress();
String nn1 = nn1RpcAddress.getHostName() + ":" + nn1RpcAddress.getPort();
String nn2 = nn2RpcAddress.getHostName() + ":" + nn2RpcAddress.getPort();
// Set the Service Rpc address to empty to make sure the node specific
// setting works
snConf1.set(DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY, "");
snConf2.set(DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY, "");
// Set the nameserviceIds
snConf1.set(DFSUtil.addKeySuffixes(
DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY, nameserviceId1),
nn1);
snConf2.set(DFSUtil.addKeySuffixes(
DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY, nameserviceId2),
nn2);
secondary1 = startSecondaryNameNode(snConf1);
secondary2 = startSecondaryNameNode(snConf2);
// make sure the two secondary namenodes are talking to correct namenodes.
assertEquals(secondary1.getNameNodeAddress().getPort(),
nn1RpcAddress.getPort());
assertEquals(secondary2.getNameNodeAddress().getPort(),
nn2RpcAddress.getPort());
assertTrue(secondary1.getNameNodeAddress().getPort() != secondary2
.getNameNodeAddress().getPort());
// both should checkpoint.
secondary1.doCheckpoint();
secondary2.doCheckpoint();
} finally {
cleanup(secondary1);
secondary1 = null;
cleanup(secondary2);
secondary2 = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test that the secondary doesn't have to re-download image
* if it hasn't changed.
*/
@Test
public void testSecondaryImageDownload() throws IOException {
LOG.info("Starting testSecondaryImageDownload");
Configuration conf = new HdfsConfiguration();
conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
Path dir = new Path("/checkpoint");
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(numDatanodes)
.format(true).build();
cluster.waitActive();
FileSystem fileSys = cluster.getFileSystem();
FSImage image = cluster.getNameNode().getFSImage();
SecondaryNameNode secondary = null;
try {
assertTrue(!fileSys.exists(dir));
//
// Make the checkpoint
//
secondary = startSecondaryNameNode(conf);
File secondaryDir = MiniDFSCluster.getCheckpointDirectory(MiniDFSCluster.getBaseDirectory(),
0, 0)[0];
File secondaryCurrent = new File(secondaryDir, "current");
long expectedTxIdToDownload = cluster.getNameNode().getFSImage()
.getStorage().getMostRecentCheckpointTxId();
File secondaryFsImageBefore = new File(secondaryCurrent,
NNStorage.getImageFileName(expectedTxIdToDownload));
File secondaryFsImageAfter = new File(secondaryCurrent,
NNStorage.getImageFileName(expectedTxIdToDownload + 2));
assertFalse("Secondary should start with empty current/ dir " +
"but " + secondaryFsImageBefore + " exists",
secondaryFsImageBefore.exists());
assertTrue("Secondary should have loaded an image",
secondary.doCheckpoint());
assertTrue("Secondary should have downloaded original image",
secondaryFsImageBefore.exists());
assertTrue("Secondary should have created a new image",
secondaryFsImageAfter.exists());
long fsimageLength = secondaryFsImageBefore.length();
assertEquals("Image size should not have changed",
fsimageLength,
secondaryFsImageAfter.length());
// change namespace
fileSys.mkdirs(dir);
assertFalse("Another checkpoint should not have to re-load image",
secondary.doCheckpoint());
for (StorageDirectory sd :
image.getStorage().dirIterable(NameNodeDirType.IMAGE)) {
File imageFile = NNStorage.getImageFile(sd, NameNodeFile.IMAGE,
expectedTxIdToDownload + 5);
assertTrue("Image size increased",
imageFile.length() > fsimageLength);
}
} finally {
fileSys.close();
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test NN restart if a failure happens in between creating the fsimage
* MD5 file and renaming the fsimage.
*/
@Test(timeout=30000)
public void testFailureBeforeRename () throws IOException {
Configuration conf = new HdfsConfiguration();
FSDataOutputStream fos = null;
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fs = cluster.getFileSystem();
secondary = startSecondaryNameNode(conf);
fos = fs.create(new Path("tmpfile0"));
fos.write(new byte[] { 0, 1, 2, 3 });
secondary.doCheckpoint();
fos.write(new byte[] { 0, 1, 2, 3 });
fos.hsync();
// Cause merge to fail in next checkpoint.
Mockito.doThrow(new IOException(
"Injecting failure after MD5Rename"))
.when(faultInjector).afterMD5Rename();
try {
secondary.doCheckpoint();
fail("Fault injection failed.");
} catch (IOException ioe) {
// This is expected.
}
Mockito.reset(faultInjector);
// Namenode should still restart successfully
cluster.restartNameNode();
} finally {
if (fs != null) {
fs.close();
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
Mockito.reset(faultInjector);
}
}
/**
* Test that a fault while downloading edits does not prevent future
* checkpointing
*/
@Test(timeout = 30000)
public void testEditFailureBeforeRename() throws IOException {
Configuration conf = new HdfsConfiguration();
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fs = cluster.getFileSystem();
secondary = startSecondaryNameNode(conf);
DFSTestUtil.createFile(fs, new Path("tmpfile0"), 1024, (short) 1, 0l);
secondary.doCheckpoint();
// Cause edit rename to fail during next checkpoint
Mockito.doThrow(new IOException("Injecting failure before edit rename"))
.when(faultInjector).beforeEditsRename();
DFSTestUtil.createFile(fs, new Path("tmpfile1"), 1024, (short) 1, 0l);
try {
secondary.doCheckpoint();
fail("Fault injection failed.");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"Injecting failure before edit rename", ioe);
}
Mockito.reset(faultInjector);
// truncate the tmp edits file to simulate a partial download
for (StorageDirectory sd : secondary.getFSImage().getStorage()
.dirIterable(NameNodeDirType.EDITS)) {
File[] tmpEdits = sd.getCurrentDir().listFiles(tmpEditsFilter);
assertTrue(
"Expected a single tmp edits file in directory " + sd.toString(),
tmpEdits.length == 1);
RandomAccessFile randFile = new RandomAccessFile(tmpEdits[0], "rw");
randFile.setLength(0);
randFile.close();
}
// Next checkpoint should succeed
secondary.doCheckpoint();
} finally {
if (secondary != null) {
secondary.shutdown();
}
if (fs != null) {
fs.close();
}
if (cluster != null) {
cluster.shutdown();
}
Mockito.reset(faultInjector);
}
}
/**
* Test that a fault while downloading edits the first time after the 2NN
* starts up does not prevent future checkpointing.
*/
@Test(timeout = 30000)
public void testEditFailureOnFirstCheckpoint() throws IOException {
Configuration conf = new HdfsConfiguration();
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fs = cluster.getFileSystem();
fs.mkdirs(new Path("test-file-1"));
// Make sure the on-disk fsimage on the NN has txid > 0.
FSNamesystem fsns = cluster.getNamesystem();
fsns.enterSafeMode(false);
fsns.saveNamespace(0, 0);
fsns.leaveSafeMode(false);
secondary = startSecondaryNameNode(conf);
// Cause edit rename to fail during next checkpoint
Mockito.doThrow(new IOException("Injecting failure before edit rename"))
.when(faultInjector).beforeEditsRename();
try {
secondary.doCheckpoint();
fail("Fault injection failed.");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"Injecting failure before edit rename", ioe);
}
Mockito.reset(faultInjector);
// Next checkpoint should succeed
secondary.doCheckpoint();
} finally {
if (secondary != null) {
secondary.shutdown();
}
if (fs != null) {
fs.close();
}
if (cluster != null) {
cluster.shutdown();
}
Mockito.reset(faultInjector);
}
}
/**
* Test that the secondary namenode correctly deletes temporary edits
* on startup.
*/
@Test(timeout = 60000)
public void testDeleteTemporaryEditsOnStartup() throws IOException {
Configuration conf = new HdfsConfiguration();
SecondaryNameNode secondary = null;
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.build();
cluster.waitActive();
fs = cluster.getFileSystem();
secondary = startSecondaryNameNode(conf);
DFSTestUtil.createFile(fs, new Path("tmpfile0"), 1024, (short) 1, 0l);
secondary.doCheckpoint();
// Cause edit rename to fail during next checkpoint
Mockito.doThrow(new IOException("Injecting failure before edit rename"))
.when(faultInjector).beforeEditsRename();
DFSTestUtil.createFile(fs, new Path("tmpfile1"), 1024, (short) 1, 0l);
try {
secondary.doCheckpoint();
fail("Fault injection failed.");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"Injecting failure before edit rename", ioe);
}
Mockito.reset(faultInjector);
// Verify that a temp edits file is present
for (StorageDirectory sd : secondary.getFSImage().getStorage()
.dirIterable(NameNodeDirType.EDITS)) {
File[] tmpEdits = sd.getCurrentDir().listFiles(tmpEditsFilter);
assertTrue(
"Expected a single tmp edits file in directory " + sd.toString(),
tmpEdits.length == 1);
}
// Restart 2NN
secondary.shutdown();
secondary = startSecondaryNameNode(conf);
// Verify that tmp files were deleted
for (StorageDirectory sd : secondary.getFSImage().getStorage()
.dirIterable(NameNodeDirType.EDITS)) {
File[] tmpEdits = sd.getCurrentDir().listFiles(tmpEditsFilter);
assertTrue(
"Did not expect a tmp edits file in directory " + sd.toString(),
tmpEdits.length == 0);
}
// Next checkpoint should succeed
secondary.doCheckpoint();
} finally {
if (secondary != null) {
secondary.shutdown();
}
if (fs != null) {
fs.close();
}
if (cluster != null) {
cluster.shutdown();
}
Mockito.reset(faultInjector);
}
}
/**
* Test case where two secondary namenodes are checkpointing the same
* NameNode. This differs from {@link #testMultipleSecondaryNamenodes()}
* since that test runs against two distinct NNs.
*
* This case tests the following interleaving:
* - 2NN A downloads image (up to txid 2)
* - 2NN A about to save its own checkpoint
* - 2NN B downloads image (up to txid 4)
* - 2NN B uploads checkpoint (txid 4)
* - 2NN A uploads checkpoint (txid 2)
*
* It verifies that this works even though the earlier-txid checkpoint gets
* uploaded after the later-txid checkpoint.
*/
@Test
public void testMultipleSecondaryNNsAgainstSameNN() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
SecondaryNameNode secondary1 = null, secondary2 = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(true)
.build();
// Start 2NNs
secondary1 = startSecondaryNameNode(conf, 1);
secondary2 = startSecondaryNameNode(conf, 2);
// Make the first 2NN's checkpoint process delayable - we can pause it
// right before it saves its checkpoint image.
CheckpointStorage spyImage1 = spyOnSecondaryImage(secondary1);
DelayAnswer delayer = new DelayAnswer(LOG);
Mockito.doAnswer(delayer).when(spyImage1)
.saveFSImageInAllDirs(Mockito.<FSNamesystem>any(), Mockito.anyLong());
// Set up a thread to do a checkpoint from the first 2NN
DoCheckpointThread checkpointThread = new DoCheckpointThread(secondary1);
checkpointThread.start();
// Wait for the first checkpointer to get to where it should save its image.
delayer.waitForCall();
// Now make the second checkpointer run an entire checkpoint
secondary2.doCheckpoint();
// Let the first one finish
delayer.proceed();
// It should have succeeded even though another checkpoint raced with it.
checkpointThread.join();
checkpointThread.propagateExceptions();
// primary should record "last checkpoint" as the higher txid (even though
// a checkpoint with a lower txid finished most recently)
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
assertEquals(4, storage.getMostRecentCheckpointTxId());
// Should have accepted both checkpoints
assertNNHasCheckpoints(cluster, ImmutableList.of(2,4));
// Now have second one checkpoint one more time just to make sure that
// the NN isn't left in a broken state
secondary2.doCheckpoint();
// NN should have received new checkpoint
assertEquals(6, storage.getMostRecentCheckpointTxId());
// Validate invariant that files named the same are the same.
assertParallelFilesInvariant(cluster, ImmutableList.of(secondary1, secondary2));
// NN should have removed the checkpoint at txid 2 at this point, but has
// one at txid 6
assertNNHasCheckpoints(cluster, ImmutableList.of(4,6));
} finally {
cleanup(secondary1);
secondary1 = null;
cleanup(secondary2);
secondary2 = null;
if (cluster != null) {
cluster.shutdown();
cluster = null;
}
}
}
/**
* Test case where two secondary namenodes are checkpointing the same
* NameNode. This differs from {@link #testMultipleSecondaryNamenodes()}
* since that test runs against two distinct NNs.
*
* This case tests the following interleaving:
* - 2NN A) calls rollEdits()
* - 2NN B) calls rollEdits()
* - 2NN A) paused at getRemoteEditLogManifest()
* - 2NN B) calls getRemoteEditLogManifest() (returns up to txid 4)
* - 2NN B) uploads checkpoint fsimage_4
* - 2NN A) allowed to proceed, also returns up to txid 4
* - 2NN A) uploads checkpoint fsimage_4 as well, should fail gracefully
*
* It verifies that one of the two gets an error that it's uploading a
* duplicate checkpoint, and the other one succeeds.
*/
@Test
public void testMultipleSecondaryNNsAgainstSameNN2() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
SecondaryNameNode secondary1 = null, secondary2 = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(true)
.build();
// Start 2NNs
secondary1 = startSecondaryNameNode(conf, 1);
secondary2 = startSecondaryNameNode(conf, 2);
// Make the first 2NN's checkpoint process delayable - we can pause it
// right before it calls getRemoteEditLogManifest.
// The method to set up a spy on an RPC protocol is a little bit involved
// since we can't spy directly on a proxy object. This sets up a mock
// which delegates all its calls to the original object, instead.
final NamenodeProtocol origNN = secondary1.getNameNode();
final Answer<Object> delegator = new GenericTestUtils.DelegateAnswer(origNN);
NamenodeProtocol spyNN = Mockito.mock(NamenodeProtocol.class, delegator);
DelayAnswer delayer = new DelayAnswer(LOG) {
@Override
protected Object passThrough(InvocationOnMock invocation) throws Throwable {
return delegator.answer(invocation);
}
};
secondary1.setNameNode(spyNN);
Mockito.doAnswer(delayer).when(spyNN)
.getEditLogManifest(Mockito.anyLong());
// Set up a thread to do a checkpoint from the first 2NN
DoCheckpointThread checkpointThread = new DoCheckpointThread(secondary1);
checkpointThread.start();
// Wait for the first checkpointer to be about to call getEditLogManifest
delayer.waitForCall();
// Now make the second checkpointer run an entire checkpoint
secondary2.doCheckpoint();
// NN should have now received fsimage_4
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
assertEquals(4, storage.getMostRecentCheckpointTxId());
// Let the first one finish
delayer.proceed();
// Letting the first node continue, it should try to upload the
// same image, and gracefully ignore it, while logging an
// error message.
checkpointThread.join();
checkpointThread.propagateExceptions();
// primary should still consider fsimage_4 the latest
assertEquals(4, storage.getMostRecentCheckpointTxId());
// Now have second one checkpoint one more time just to make sure that
// the NN isn't left in a broken state
secondary2.doCheckpoint();
assertEquals(6, storage.getMostRecentCheckpointTxId());
// Should have accepted both checkpoints
assertNNHasCheckpoints(cluster, ImmutableList.of(4,6));
// Let the first one also go again on its own to make sure it can
// continue at next checkpoint
secondary1.setNameNode(origNN);
secondary1.doCheckpoint();
// NN should have received new checkpoint
assertEquals(8, storage.getMostRecentCheckpointTxId());
// Validate invariant that files named the same are the same.
assertParallelFilesInvariant(cluster, ImmutableList.of(secondary1, secondary2));
// Validate that the NN received checkpoints at expected txids
// (i.e that both checkpoints went through)
assertNNHasCheckpoints(cluster, ImmutableList.of(6,8));
} finally {
cleanup(secondary1);
secondary1 = null;
cleanup(secondary2);
secondary2 = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test case where the name node is reformatted while the secondary namenode
* is running. The secondary should shut itself down if if talks to a NN
* with the wrong namespace.
*/
@Test
public void testReformatNNBetweenCheckpoints() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
conf.setInt(CommonConfigurationKeysPublic.IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY,
1);
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(true).build();
int origPort = cluster.getNameNodePort();
int origHttpPort = cluster.getNameNode().getHttpAddress().getPort();
Configuration snnConf = new Configuration(conf);
File checkpointDir = new File(MiniDFSCluster.getBaseDirectory(),
"namesecondary");
snnConf.set(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_DIR_KEY,
checkpointDir.getAbsolutePath());
secondary = startSecondaryNameNode(snnConf);
// secondary checkpoints once
secondary.doCheckpoint();
// we reformat primary NN
cluster.shutdown();
cluster = null;
// Brief sleep to make sure that the 2NN's IPC connection to the NN
// is dropped.
try {
Thread.sleep(100);
} catch (InterruptedException ie) {
}
// Start a new NN with the same host/port.
cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(0)
.nameNodePort(origPort)
.nameNodeHttpPort(origHttpPort)
.format(true).build();
try {
secondary.doCheckpoint();
fail("Should have failed checkpoint against a different namespace");
} catch (IOException ioe) {
LOG.info("Got expected failure", ioe);
assertTrue(ioe.toString().contains("Inconsistent checkpoint"));
}
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test that the primary NN will not serve any files to a 2NN who doesn't
* share its namespace ID, and also will not accept any files from one.
*/
@Test
public void testNamespaceVerifiedOnFileTransfer() throws IOException {
MiniDFSCluster cluster = null;
Configuration conf = new HdfsConfiguration();
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(true).build();
NamenodeProtocols nn = cluster.getNameNodeRpc();
URL fsName = DFSUtil.getInfoServer(
cluster.getNameNode().getServiceRpcAddress(), conf,
DFSUtil.getHttpClientScheme(conf)).toURL();
// Make a finalized log on the server side.
nn.rollEditLog();
RemoteEditLogManifest manifest = nn.getEditLogManifest(1);
RemoteEditLog log = manifest.getLogs().get(0);
NNStorage dstImage = Mockito.mock(NNStorage.class);
Mockito.doReturn(Lists.newArrayList(new File("/wont-be-written")))
.when(dstImage).getFiles(
Mockito.<NameNodeDirType>any(), Mockito.anyString());
File mockImageFile = File.createTempFile("image", "");
FileOutputStream imageFile = new FileOutputStream(mockImageFile);
imageFile.write("data".getBytes());
imageFile.close();
Mockito.doReturn(mockImageFile).when(dstImage)
.findImageFile(Mockito.any(NameNodeFile.class), Mockito.anyLong());
Mockito.doReturn(new StorageInfo(1, 1, "X", 1, NodeType.NAME_NODE).toColonSeparatedString())
.when(dstImage).toColonSeparatedString();
try {
TransferFsImage.downloadImageToStorage(fsName, 0, dstImage, false, false);
fail("Storage info was not verified");
} catch (IOException ioe) {
String msg = StringUtils.stringifyException(ioe);
assertTrue(msg, msg.contains("but the secondary expected"));
}
try {
TransferFsImage.downloadEditsToStorage(fsName, log, dstImage);
fail("Storage info was not verified");
} catch (IOException ioe) {
String msg = StringUtils.stringifyException(ioe);
assertTrue(msg, msg.contains("but the secondary expected"));
}
try {
TransferFsImage.uploadImageFromStorage(fsName, conf, dstImage,
NameNodeFile.IMAGE, 0);
fail("Storage info was not verified");
} catch (IOException ioe) {
String msg = StringUtils.stringifyException(ioe);
assertTrue(msg, msg.contains("but the secondary expected"));
}
} finally {
cleanup(cluster);
cluster = null;
}
}
/**
* Test that, if a storage directory is failed when a checkpoint occurs,
* the non-failed storage directory receives the checkpoint.
*/
@Test
public void testCheckpointWithFailedStorageDir() throws Exception {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
File currentDir = null;
Configuration conf = new HdfsConfiguration();
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(true).build();
secondary = startSecondaryNameNode(conf);
// Checkpoint once
secondary.doCheckpoint();
// Now primary NN experiences failure of a volume -- fake by
// setting its current dir to a-x permissions
NamenodeProtocols nn = cluster.getNameNodeRpc();
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
StorageDirectory sd0 = storage.getStorageDir(0);
StorageDirectory sd1 = storage.getStorageDir(1);
currentDir = sd0.getCurrentDir();
FileUtil.setExecutable(currentDir, false);
// Upload checkpoint when NN has a bad storage dir. This should
// succeed and create the checkpoint in the good dir.
secondary.doCheckpoint();
GenericTestUtils.assertExists(
new File(sd1.getCurrentDir(), NNStorage.getImageFileName(2)));
// Restore the good dir
FileUtil.setExecutable(currentDir, true);
nn.restoreFailedStorage("true");
nn.rollEditLog();
// Checkpoint again -- this should upload to both dirs
secondary.doCheckpoint();
assertNNHasCheckpoints(cluster, ImmutableList.of(8));
assertParallelFilesInvariant(cluster, ImmutableList.of(secondary));
} finally {
if (currentDir != null) {
FileUtil.setExecutable(currentDir, true);
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test case where the NN is configured with a name-only and an edits-only
* dir, with storage-restore turned on. In this case, if the name-only dir
* disappears and comes back, a new checkpoint after it has been restored
* should function correctly.
* @throws Exception
*/
@Test
public void testCheckpointWithSeparateDirsAfterNameFails() throws Exception {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
File currentDir = null;
Configuration conf = new HdfsConfiguration();
File base_dir = new File(MiniDFSCluster.getBaseDirectory());
conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_RESTORE_KEY, true);
conf.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY,
MiniDFSCluster.getBaseDirectory() + "/name-only");
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
MiniDFSCluster.getBaseDirectory() + "/edits-only");
conf.set(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_DIR_KEY,
fileAsURI(new File(base_dir, "namesecondary1")).toString());
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(true)
.manageNameDfsDirs(false).build();
secondary = startSecondaryNameNode(conf);
// Checkpoint once
secondary.doCheckpoint();
// Now primary NN experiences failure of its only name dir -- fake by
// setting its current dir to a-x permissions
NamenodeProtocols nn = cluster.getNameNodeRpc();
NNStorage storage = cluster.getNameNode().getFSImage().getStorage();
StorageDirectory sd0 = storage.getStorageDir(0);
assertEquals(NameNodeDirType.IMAGE, sd0.getStorageDirType());
currentDir = sd0.getCurrentDir();
assertEquals(0, FileUtil.chmod(currentDir.getAbsolutePath(), "000"));
// Try to upload checkpoint -- this should fail since there are no
// valid storage dirs
try {
secondary.doCheckpoint();
fail("Did not fail to checkpoint when there are no valid storage dirs");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"No targets in destination storage", ioe);
}
// Restore the good dir
assertEquals(0, FileUtil.chmod(currentDir.getAbsolutePath(), "755"));
nn.restoreFailedStorage("true");
nn.rollEditLog();
// Checkpoint again -- this should upload to the restored name dir
secondary.doCheckpoint();
assertNNHasCheckpoints(cluster, ImmutableList.of(8));
assertParallelFilesInvariant(cluster, ImmutableList.of(secondary));
} finally {
if (currentDir != null) {
FileUtil.chmod(currentDir.getAbsolutePath(), "755");
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test that the 2NN triggers a checkpoint after the configurable interval
*/
@Test(timeout=30000)
public void testCheckpointTriggerOnTxnCount() throws Exception {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 10);
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_CHECK_PERIOD_KEY, 1);
try {
cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(0)
.format(true).build();
FileSystem fs = cluster.getFileSystem();
secondary = startSecondaryNameNode(conf);
secondary.startCheckpointThread();
final NNStorage storage = secondary.getFSImage().getStorage();
// 2NN should checkpoint at startup
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
LOG.info("Waiting for checkpoint txn id to go to 2");
return storage.getMostRecentCheckpointTxId() == 2;
}
}, 200, 15000);
// If we make 10 transactions, it should checkpoint again
for (int i = 0; i < 10; i++) {
fs.mkdirs(new Path("/test" + i));
}
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
LOG.info("Waiting for checkpoint txn id to go > 2");
return storage.getMostRecentCheckpointTxId() > 2;
}
}, 200, 15000);
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Test case where the secondary does a checkpoint, then stops for a while.
* In the meantime, the NN saves its image several times, so that the
* logs that connect the 2NN's old checkpoint to the current txid
* get archived. Then, the 2NN tries to checkpoint again.
*/
@Test
public void testSecondaryHasVeryOutOfDateImage() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(true).build();
secondary = startSecondaryNameNode(conf);
// Checkpoint once
secondary.doCheckpoint();
// Now primary NN saves namespace 3 times
NamenodeProtocols nn = cluster.getNameNodeRpc();
nn.setSafeMode(SafeModeAction.SAFEMODE_ENTER, false);
for (int i = 0; i < 3; i++) {
nn.saveNamespace(0, 0);
}
nn.setSafeMode(SafeModeAction.SAFEMODE_LEAVE, false);
// Now the secondary tries to checkpoint again with its
// old image in memory.
secondary.doCheckpoint();
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Regression test for HDFS-3678 "Edit log files are never being purged from 2NN"
*/
@Test
public void testSecondaryPurgesEditLogs() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
conf.setInt(DFSConfigKeys.DFS_NAMENODE_NUM_EXTRA_EDITS_RETAINED_KEY, 0);
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(true)
.build();
FileSystem fs = cluster.getFileSystem();
fs.mkdirs(new Path("/foo"));
secondary = startSecondaryNameNode(conf);
// Checkpoint a few times. Doing this will cause a log roll, and thus
// several edit log segments on the 2NN.
for (int i = 0; i < 5; i++) {
secondary.doCheckpoint();
}
// Make sure there are no more edit log files than there should be.
List<File> checkpointDirs = getCheckpointCurrentDirs(secondary);
for (File checkpointDir : checkpointDirs) {
List<EditLogFile> editsFiles = FileJournalManager.matchEditLogs(
checkpointDir);
assertEquals("Edit log files were not purged from 2NN", 1,
editsFiles.size());
}
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Regression test for HDFS-3835 - "Long-lived 2NN cannot perform a
* checkpoint if security is enabled and the NN restarts without outstanding
* delegation tokens"
*/
@Test
public void testSecondaryNameNodeWithDelegationTokens() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
Configuration conf = new HdfsConfiguration();
conf.setBoolean(
DFSConfigKeys.DFS_NAMENODE_DELEGATION_TOKEN_ALWAYS_USE_KEY, true);
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(true).build();
assertNotNull(cluster.getNamesystem().getDelegationToken(new Text("atm")));
secondary = startSecondaryNameNode(conf);
// Checkpoint once, so the 2NN loads the DT into its in-memory sate.
secondary.doCheckpoint();
// Perform a saveNamespace, so that the NN has a new fsimage, and the 2NN
// therefore needs to download a new fsimage the next time it performs a
// checkpoint.
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_ENTER, false);
cluster.getNameNodeRpc().saveNamespace(0, 0);
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_LEAVE, false);
// Ensure that the 2NN can still perform a checkpoint.
secondary.doCheckpoint();
} finally {
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
/**
* Regression test for HDFS-3849. This makes sure that when we re-load the
* FSImage in the 2NN, we clear the existing leases.
*/
@Test
public void testSecondaryNameNodeWithSavedLeases() throws IOException {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
FSDataOutputStream fos = null;
Configuration conf = new HdfsConfiguration();
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(true).build();
FileSystem fs = cluster.getFileSystem();
fos = fs.create(new Path("tmpfile"));
fos.write(new byte[] { 0, 1, 2, 3 });
fos.hflush();
assertEquals(1, cluster.getNamesystem().getLeaseManager().countLease());
secondary = startSecondaryNameNode(conf);
assertEquals(0, secondary.getFSNamesystem().getLeaseManager().countLease());
// Checkpoint once, so the 2NN loads the lease into its in-memory sate.
secondary.doCheckpoint();
assertEquals(1, secondary.getFSNamesystem().getLeaseManager().countLease());
fos.close();
fos = null;
// Perform a saveNamespace, so that the NN has a new fsimage, and the 2NN
// therefore needs to download a new fsimage the next time it performs a
// checkpoint.
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_ENTER, false);
cluster.getNameNodeRpc().saveNamespace(0, 0);
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_LEAVE, false);
// Ensure that the 2NN can still perform a checkpoint.
secondary.doCheckpoint();
// And the leases have been cleared...
assertEquals(0, secondary.getFSNamesystem().getLeaseManager().countLease());
} finally {
if (fos != null) {
fos.close();
}
cleanup(secondary);
secondary = null;
cleanup(cluster);
cluster = null;
}
}
@Test
public void testCommandLineParsing() throws ParseException {
SecondaryNameNode.CommandLineOpts opts =
new SecondaryNameNode.CommandLineOpts();
opts.parse();
assertNull(opts.getCommand());
opts.parse("-checkpoint");
assertEquals(SecondaryNameNode.CommandLineOpts.Command.CHECKPOINT,
opts.getCommand());
assertFalse(opts.shouldForceCheckpoint());
opts.parse("-checkpoint", "force");
assertEquals(SecondaryNameNode.CommandLineOpts.Command.CHECKPOINT,
opts.getCommand());
assertTrue(opts.shouldForceCheckpoint());
opts.parse("-geteditsize");
assertEquals(SecondaryNameNode.CommandLineOpts.Command.GETEDITSIZE,
opts.getCommand());
opts.parse("-format");
assertTrue(opts.shouldFormat());
try {
opts.parse("-geteditsize", "-checkpoint");
fail("Should have failed bad parsing for two actions");
} catch (ParseException e) {
LOG.warn("Encountered ", e);
}
try {
opts.parse("-checkpoint", "xx");
fail("Should have failed for bad checkpoint arg");
} catch (ParseException e) {
LOG.warn("Encountered ", e);
}
}
@Test
public void testLegacyOivImage() throws Exception {
MiniDFSCluster cluster = null;
SecondaryNameNode secondary = null;
File tmpDir = GenericTestUtils.getTestDir("testLegacyOivImage");
tmpDir.mkdirs();
Configuration conf = new HdfsConfiguration();
conf.set(DFSConfigKeys.DFS_NAMENODE_LEGACY_OIV_IMAGE_DIR_KEY,
tmpDir.getAbsolutePath());
conf.set(DFSConfigKeys.DFS_NAMENODE_NUM_CHECKPOINTS_RETAINED_KEY,
"2");
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(true).build();
secondary = startSecondaryNameNode(conf);
// Checkpoint once
secondary.doCheckpoint();
String files1[] = tmpDir.list();
assertEquals("Only one file is expected", 1, files1.length);
// Perform more checkpointngs and check whether retention management
// is working.
secondary.doCheckpoint();
secondary.doCheckpoint();
String files2[] = tmpDir.list();
assertEquals("Two files are expected", 2, files2.length);
// Verify that the first file is deleted.
for (String fName : files2) {
assertFalse(fName.equals(files1[0]));
}
} finally {
cleanup(secondary);
cleanup(cluster);
tmpDir.delete();
}
}
@Test(timeout = 300000)
public void testActiveRejectSmallerTxidDeltaImage() throws Exception {
MiniDFSCluster cluster = null;
Configuration conf = new HdfsConfiguration();
// Set the delta txid threshold to 10
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 10);
// Set the delta time threshold to some arbitrarily large value, so
// it does not trigger a checkpoint during this test.
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_PERIOD_KEY, 900000);
SecondaryNameNode secondary = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
.format(true).build();
// enable small delta rejection
NameNode active = cluster.getNameNode();
active.httpServer.getHttpServer()
.setAttribute(RECENT_IMAGE_CHECK_ENABLED, true);
secondary = startSecondaryNameNode(conf);
FileSystem fs = cluster.getFileSystem();
assertEquals(0, active.getNamesystem().getFSImage()
.getMostRecentCheckpointTxId());
// create 5 dir.
for (int i = 0; i < 5; i++) {
fs.mkdirs(new Path("dir-" + i));
}
// Checkpoint 1st
secondary.doCheckpoint();
// at this point, the txid delta is smaller than threshold 10.
// active does not accept this image.
assertEquals(0, active.getNamesystem().getFSImage()
.getMostRecentCheckpointTxId());
// create another 10 dir.
for (int i = 0; i < 10; i++) {
fs.mkdirs(new Path("dir2-" + i));
}
// Checkpoint 2nd
secondary.doCheckpoint();
// here the delta is large enough and active accepts this image.
assertEquals(21, active.getNamesystem().getFSImage()
.getMostRecentCheckpointTxId());
} finally {
cleanup(secondary);
cleanup(cluster);
}
}
/**
* Test that even with txid and time delta threshold, by having time
* relaxation, SBN can still upload images to ANN.
*
* @throws Exception
*/
@Test
public void testActiveImageWithTimeDeltaRelaxation() throws Exception {
Configuration conf = new HdfsConfiguration();
// Set the delta txid threshold to some arbitrarily large value, so
// it does not trigger a checkpoint during this test.
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 1000000);
// Set the delta time threshold to some arbitrarily large value, so
// it does not trigger a checkpoint during this test.
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_PERIOD_KEY, 900000);
// Set relaxation to 0, means time delta = 0 from previous image is fine,
// this will effectively disable reject small delta image
ImageServlet.setRecentImageCheckTimePrecision(0);
SecondaryNameNode secondary = null;
try (MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(0).format(true).build()) {
// enable small delta rejection
NameNode active = cluster.getNameNode();
active.httpServer.getHttpServer()
.setAttribute(RECENT_IMAGE_CHECK_ENABLED, true);
secondary = startSecondaryNameNode(conf);
FileSystem fs = cluster.getFileSystem();
assertEquals(0, active.getNamesystem().getFSImage()
.getMostRecentCheckpointTxId());
// create 5 dir.
for (int i = 0; i < 5; i++) {
fs.mkdirs(new Path("dir-" + i));
}
// Checkpoint 1st
secondary.doCheckpoint();
// at this point, despite this is a small delta change, w.r.t both
// txid and time delta, due to we set relaxation to 0, this image
// still gets accepted
assertEquals(9, active.getNamesystem().getFSImage()
.getMostRecentCheckpointTxId());
} finally {
cleanup(secondary);
}
}
private static void cleanup(SecondaryNameNode snn) {
if (snn != null) {
try {
snn.shutdown();
} catch (Exception e) {
LOG.warn("Could not shut down secondary namenode", e);
}
}
}
private static void cleanup(MiniDFSCluster cluster) {
if (cluster != null) {
try {
cluster.shutdown();
} catch (Exception e) {
LOG.warn("Could not shutdown MiniDFSCluster ", e);
}
}
}
/**
* Assert that if any two files have the same name across the 2NNs
* and NN, they should have the same content too.
*/
private void assertParallelFilesInvariant(MiniDFSCluster cluster,
ImmutableList<SecondaryNameNode> secondaries) throws Exception {
List<File> allCurrentDirs = Lists.newArrayList();
allCurrentDirs.addAll(getNameNodeCurrentDirs(cluster, 0));
for (SecondaryNameNode snn : secondaries) {
allCurrentDirs.addAll(getCheckpointCurrentDirs(snn));
}
FSImageTestUtil.assertParallelFilesAreIdentical(allCurrentDirs,
ImmutableSet.of("VERSION"));
}
private static List<File> getCheckpointCurrentDirs(SecondaryNameNode secondary) {
List<File> ret = Lists.newArrayList();
for (String u : secondary.getCheckpointDirectories()) {
File checkpointDir = new File(URI.create(u).getPath());
ret.add(new File(checkpointDir, "current"));
}
return ret;
}
private static CheckpointStorage spyOnSecondaryImage(SecondaryNameNode secondary1) {
CheckpointStorage spy = Mockito.spy((CheckpointStorage)secondary1.getFSImage());
secondary1.setFSImage(spy);
return spy;
}
/**
* A utility class to perform a checkpoint in a different thread.
*/
private static class DoCheckpointThread extends Thread {
private final SecondaryNameNode snn;
private volatile Throwable thrown = null;
DoCheckpointThread(SecondaryNameNode snn) {
this.snn = snn;
}
@Override
public void run() {
try {
snn.doCheckpoint();
} catch (Throwable t) {
thrown = t;
}
}
void propagateExceptions() {
if (thrown != null) {
throw new RuntimeException(thrown);
}
}
}
}