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HDFS-2874. Edit log should log to shared dirs before local dirs. Contributed by Todd Lipcon. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1240445 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2012-02-04 02:52:53 +00:00
parent 969318cfc2
commit 11df1c2561
11 changed files with 156 additions and 64 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
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@ -160,3 +160,5 @@ HDFS-2769. HA: When HA is enabled with a shared edits dir, that dir should be
marked required. (atm via eli)
HDFS-2863. Failures observed if dfs.edits.dir and shared.edits.dir have same directories. (Bikas Saha via atm)
HDFS-2874. Edit log should log to shared dirs before local dirs. (todd)

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java
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@ -23,6 +23,7 @@ import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
@ -97,9 +98,9 @@ public final class Util {
* @param names collection of strings to convert to URIs
* @return collection of URIs
*/
public static Collection<URI> stringCollectionAsURIs(
public static List<URI> stringCollectionAsURIs(
Collection<String> names) {
Collection<URI> uris = new ArrayList<URI>(names.size());
List<URI> uris = new ArrayList<URI>(names.size());
for(String name : names) {
try {
uris.add(stringAsURI(name));

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java
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@ -126,12 +126,12 @@ public class FSEditLog {
private NNStorage storage;
private Configuration conf;
private Collection<URI> editsDirs;
private List<URI> editsDirs;
/**
* The edit directories that are shared between primary and secondary.
*/
private Collection<URI> sharedEditsDirs;
private List<URI> sharedEditsDirs;
private static class TransactionId {
public long txid;
@ -170,11 +170,11 @@ public class FSEditLog {
* @param storage Storage object used by namenode
* @param editsDirs List of journals to use
*/
FSEditLog(Configuration conf, NNStorage storage, Collection<URI> editsDirs) {
FSEditLog(Configuration conf, NNStorage storage, List<URI> editsDirs) {
init(conf, storage, editsDirs);
}
private void init(Configuration conf, NNStorage storage, Collection<URI> editsDirs) {
private void init(Configuration conf, NNStorage storage, List<URI> editsDirs) {
isSyncRunning = false;
this.conf = conf;
this.storage = storage;
@ -209,7 +209,7 @@ public class FSEditLog {
state = State.OPEN_FOR_READING;
}
private void initJournals(Collection<URI> dirs) {
private void initJournals(List<URI> dirs) {
int minimumRedundantJournals = conf.getInt(
DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_MINIMUM_KEY,
DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_MINIMUM_DEFAULT);

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
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@ -115,7 +115,7 @@ public class FSImage implements Closeable {
*/
protected FSImage(Configuration conf,
Collection<URI> imageDirs,
Collection<URI> editsDirs)
List<URI> editsDirs)
throws IOException {
this.conf = conf;
@ -485,7 +485,7 @@ public class FSImage implements Closeable {
void doImportCheckpoint(FSNamesystem target) throws IOException {
Collection<URI> checkpointDirs =
FSImage.getCheckpointDirs(conf, null);
Collection<URI> checkpointEditsDirs =
List<URI> checkpointEditsDirs =
FSImage.getCheckpointEditsDirs(conf, null);
if (checkpointDirs == null || checkpointDirs.isEmpty()) {
@ -1094,7 +1094,7 @@ public class FSImage implements Closeable {
return Util.stringCollectionAsURIs(dirNames);
}
static Collection<URI> getCheckpointEditsDirs(Configuration conf,
static List<URI> getCheckpointEditsDirs(Configuration conf,
String defaultName) {
Collection<String> dirNames =
conf.getStringCollection(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_EDITS_DIR_KEY);

59
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -86,6 +86,7 @@ import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
@ -190,10 +191,8 @@ import org.apache.hadoop.util.VersionInfo;
import org.mortbay.util.ajax.JSON;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
/***************************************************
* FSNamesystem does the actual bookkeeping work for the
@ -350,7 +349,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
public static FSNamesystem loadFromDisk(Configuration conf)
throws IOException {
Collection<URI> namespaceDirs = FSNamesystem.getNamespaceDirs(conf);
Collection<URI> namespaceEditsDirs =
List<URI> namespaceEditsDirs =
FSNamesystem.getNamespaceEditsDirs(conf);
if (namespaceDirs.size() == 1) {
@ -678,28 +677,44 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
return Util.stringCollectionAsURIs(dirNames);
}
public static Collection<URI> getNamespaceEditsDirs(Configuration conf) {
Collection<URI> editsDirs = getStorageDirs(conf, DFS_NAMENODE_EDITS_DIR_KEY);
editsDirs.addAll(getSharedEditsDirs(conf));
Set<URI> uniqueEditsDirs = new HashSet<URI>();
uniqueEditsDirs.addAll(editsDirs);
if (uniqueEditsDirs.size() != editsDirs.size()) {
// clearing and re-initializing editsDirs to preserve Collection semantics
// assigning finalEditsDirs to editsDirs would leak Set semantics in the
// return value and cause unexpected results downstream. eg future addAll
// calls. Perf is not an issue since these are small lists.
editsDirs.clear();
editsDirs.addAll(uniqueEditsDirs);
LOG.warn("Overlapping entries in " + DFS_NAMENODE_EDITS_DIR_KEY
+ " and/or " + DFS_NAMENODE_SHARED_EDITS_DIR_KEY
+ ". Using the following entries: " + Joiner.on(',').join(editsDirs));
/**
* Return an ordered list of edits directories to write to.
* The list is ordered such that all shared edits directories
* are ordered before non-shared directories, and any duplicates
* are removed. The order they are specified in the configuration
* is retained.
*/
public static List<URI> getNamespaceEditsDirs(Configuration conf) {
// Use a LinkedHashSet so that order is maintained while we de-dup
// the entries.
LinkedHashSet<URI> editsDirs = new LinkedHashSet<URI>();
// First add the shared edits dirs. It's critical that the shared dirs
// are added first, since JournalSet syncs them in the order they are listed,
// and we need to make sure all edits are in place in the shared storage
// before they are replicated locally. See HDFS-2874.
for (URI dir : getSharedEditsDirs(conf)) {
if (!editsDirs.add(dir)) {
LOG.warn("Edits URI " + dir + " listed multiple times in " +
DFS_NAMENODE_SHARED_EDITS_DIR_KEY + ". Ignoring duplicates.");
}
}
// Now add the non-shared dirs.
for (URI dir : getStorageDirs(conf, DFS_NAMENODE_EDITS_DIR_KEY)) {
if (!editsDirs.add(dir)) {
LOG.warn("Edits URI " + dir + " listed multiple times in " +
DFS_NAMENODE_SHARED_EDITS_DIR_KEY + " and " +
DFS_NAMENODE_EDITS_DIR_KEY + ". Ignoring duplicates.");
}
}
if (editsDirs.isEmpty()) {
// If this is the case, no edit dirs have been explicitly configured.
// Image dirs are to be used for edits too.
return getNamespaceDirs(conf);
return Lists.newArrayList(getNamespaceDirs(conf));
} else {
return editsDirs;
return Lists.newArrayList(editsDirs);
}
}
@ -708,7 +723,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
* @param conf
* @return Collection of edit directories.
*/
public static Collection<URI> getSharedEditsDirs(Configuration conf) {
public static List<URI> getSharedEditsDirs(Configuration conf) {
// don't use getStorageDirs here, because we want an empty default
// rather than the dir in /tmp
Collection<String> dirNames = conf.getTrimmedStringCollection(

23
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/JournalSet.java
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@ -309,15 +309,27 @@ public class JournalSet implements JournalManager {
*/
private void mapJournalsAndReportErrors(
JournalClosure closure, String status) throws IOException{
List<JournalAndStream> badJAS = Lists.newLinkedList();
for (JournalAndStream jas : journals) {
try {
closure.apply(jas);
} catch (Throwable t) {
if (jas.isRequired()) {
String msg = "Error: " + status + " failed for required journal ("
+ jas + ")";
LOG.fatal(msg, t);
// If we fail on *any* of the required journals, then we must not
// continue on any of the other journals. Abort them to ensure that
// retry behavior doesn't allow them to keep going in any way.
abortAllJournals();
throw new IOException(msg);
} else {
LOG.error("Error: " + status + " failed for (journal " + jas + ")", t);
badJAS.add(jas);
}
}
}
disableAndReportErrorOnJournals(badJAS);
if (!NameNodeResourcePolicy.areResourcesAvailable(journals,
minimumRedundantJournals)) {
@ -327,6 +339,17 @@ public class JournalSet implements JournalManager {
}
}
/**
* Abort all of the underlying streams.
*/
private void abortAllJournals() {
for (JournalAndStream jas : journals) {
if (jas.isActive()) {
jas.abort();
}
}
}
/**
* An implementation of EditLogOutputStream that applies a requested method on
* all the journals that are currently active.

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java
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@ -661,7 +661,7 @@ public class NameNode {
}
Collection<URI> dirsToFormat = FSNamesystem.getNamespaceDirs(conf);
Collection<URI> editDirsToFormat =
List<URI> editDirsToFormat =
FSNamesystem.getNamespaceEditsDirs(conf);
for(Iterator<URI> it = dirsToFormat.iterator(); it.hasNext();) {
File curDir = new File(it.next().getPath());

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SecondaryNameNode.java
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@ -114,7 +114,7 @@ public class SecondaryNameNode implements Runnable {
private String infoBindAddress;
private Collection<URI> checkpointDirs;
private Collection<URI> checkpointEditsDirs;
private List<URI> checkpointEditsDirs;
private CheckpointConf checkpointConf;
private FSNamesystem namesystem;
@ -729,7 +729,7 @@ public class SecondaryNameNode implements Runnable {
*/
CheckpointStorage(Configuration conf,
Collection<URI> imageDirs,
Collection<URI> editsDirs) throws IOException {
List<URI> editsDirs) throws IOException {
super(conf, imageDirs, editsDirs);
// the 2NN never writes edits -- it only downloads them. So

3
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestClusterId.java
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@ -26,6 +26,7 @@ import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import org.apache.commons.logging.Log;
@ -47,7 +48,7 @@ public class TestClusterId {
private String getClusterId(Configuration config) throws IOException {
// see if cluster id not empty.
Collection<URI> dirsToFormat = FSNamesystem.getNamespaceDirs(config);
Collection<URI> editsToFormat = FSNamesystem.getNamespaceEditsDirs(config);
List<URI> editsToFormat = FSNamesystem.getNamespaceEditsDirs(config);
FSImage fsImage = new FSImage(config, dirsToFormat, editsToFormat);
Iterator<StorageDirectory> sdit =

49
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogJournalFailures.java
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@ -42,6 +42,7 @@ import org.apache.hadoop.hdfs.server.namenode.JournalSet.JournalAndStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;
import org.mockito.verification.VerificationMode;
public class TestEditLogJournalFailures {
@ -144,21 +145,35 @@ public class TestEditLogJournalFailures {
DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY);
shutDownMiniCluster();
Configuration conf = new HdfsConfiguration();
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_REQUIRED_KEY, editsDirs[1]);
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_REQUIRED_KEY, editsDirs[0]);
conf.setInt(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_MINIMUM_KEY, 0);
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKED_VOLUMES_MINIMUM_KEY, 0);
setUpMiniCluster(conf, true);
assertTrue(doAnEdit());
// Invalidated the one required edits journal.
invalidateEditsDirAtIndex(1, false, false);
invalidateEditsDirAtIndex(0, false, false);
JournalAndStream nonRequiredJas = getJournalAndStream(1);
EditLogFileOutputStream nonRequiredSpy =
spyOnStream(nonRequiredJas);
// Make sure runtime.exit(...) hasn't been called at all yet.
assertExitInvocations(0);
// ..and that the other stream is active.
assertTrue(nonRequiredJas.isActive());
// This will actually return true in the tests, since the NN will not in
// fact call Runtime.exit();
doAnEdit();
// Since the required directory failed setReadyToFlush, and that
// directory was listed prior to the non-required directory,
// we should not call setReadyToFlush on the non-required
// directory. Regression test for HDFS-2874.
Mockito.verify(nonRequiredSpy, Mockito.never()).setReadyToFlush();
assertFalse(nonRequiredJas.isActive());
// A single failure of a required journal should result in a call to
// runtime.exit(...).
assertExitInvocations(atLeast(1));
@ -217,15 +232,10 @@ public class TestEditLogJournalFailures {
* @param index the index of the journal to take offline.
* @return the original <code>EditLogOutputStream</code> of the journal.
*/
private EditLogOutputStream invalidateEditsDirAtIndex(int index,
private void invalidateEditsDirAtIndex(int index,
boolean failOnFlush, boolean failOnWrite) throws IOException {
FSImage fsimage = cluster.getNamesystem().getFSImage();
FSEditLog editLog = fsimage.getEditLog();
JournalAndStream jas = editLog.getJournals().get(index);
EditLogFileOutputStream elos =
(EditLogFileOutputStream) jas.getCurrentStream();
EditLogFileOutputStream spyElos = spy(elos);
JournalAndStream jas = getJournalAndStream(index);
EditLogFileOutputStream spyElos = spyOnStream(jas);
if (failOnWrite) {
doThrow(new IOException("fail on write()")).when(spyElos).write(
(FSEditLogOp) any());
@ -237,25 +247,24 @@ public class TestEditLogJournalFailures {
.setReadyToFlush();
}
doNothing().when(spyElos).abort();
}
private EditLogFileOutputStream spyOnStream(JournalAndStream jas) {
EditLogFileOutputStream elos =
(EditLogFileOutputStream) jas.getCurrentStream();
EditLogFileOutputStream spyElos = spy(elos);
jas.setCurrentStreamForTests(spyElos);
return elos;
return spyElos;
}
/**
* Restore the journal at index <code>index</code> with the passed
* {@link EditLogOutputStream}.
*
* @param index index of the journal to restore.
* @param elos the {@link EditLogOutputStream} to put at that index.
* Pull out one of the JournalAndStream objects from the edit log.
*/
private void restoreEditsDirAtIndex(int index, EditLogOutputStream elos) {
private JournalAndStream getJournalAndStream(int index) {
FSImage fsimage = cluster.getNamesystem().getFSImage();
FSEditLog editLog = fsimage.getEditLog();
JournalAndStream jas = editLog.getJournals().get(index);
jas.setCurrentStreamForTests(elos);
return editLog.getJournals().get(index);
}
/**

51
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestFailureOfSharedDir.java
View File

@ -24,6 +24,7 @@ import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
@ -35,6 +36,7 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NNStorage;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
@ -66,6 +68,35 @@ public class TestFailureOfSharedDir {
requiredEditsDirs.contains(bar));
}
/**
* Make sure that the shared edits dirs are listed before non-shared dirs
* when the configuration is parsed. This ensures that the shared journals
* are synced before the local ones.
*/
@Test
public void testSharedDirsComeFirstInEditsList() throws Exception {
Configuration conf = new Configuration();
URI sharedA = new URI("file:///shared-A");
URI sharedB = new URI("file:///shared-B");
URI localA = new URI("file:///local-A");
URI localB = new URI("file:///local-B");
URI localC = new URI("file:///local-C");
conf.set(DFSConfigKeys.DFS_NAMENODE_SHARED_EDITS_DIR_KEY,
Joiner.on(",").join(sharedA,sharedB));
// List them in reverse order, to make sure they show up in
// the order listed, regardless of lexical sort order.
conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
Joiner.on(",").join(localC, localB, localA));
List<URI> dirs = FSNamesystem.getNamespaceEditsDirs(conf);
assertEquals(
"Shared dirs should come first, then local dirs, in the order " +
"they were listed in the configuration.",
Joiner.on(",").join(sharedA, sharedB, localC, localB, localA),
Joiner.on(",").join(dirs));
}
/**
* Test that marking the shared edits dir as being "required" causes the NN to
* fail if that dir can't be accessed.
@ -73,10 +104,8 @@ public class TestFailureOfSharedDir {
@Test
public void testFailureOfSharedDir() throws Exception {
Configuration conf = new Configuration();
// The shared edits dir will automatically be marked required.
URI sharedEditsUri = MiniDFSCluster.formatSharedEditsDir(
new File(MiniDFSCluster.getBaseDirectory()), 0, 1);
// The shared edits dir will automatically be marked required.
MiniDFSCluster cluster = null;
try {
cluster = new MiniDFSCluster.Builder(conf)
@ -84,8 +113,6 @@ public class TestFailureOfSharedDir {
.numDataNodes(0)
.build();
assertEquals(sharedEditsUri, cluster.getSharedEditsDir(0, 1));
cluster.waitActive();
cluster.transitionToActive(0);
@ -94,6 +121,7 @@ public class TestFailureOfSharedDir {
assertTrue(fs.mkdirs(new Path("/test1")));
// Blow away the shared edits dir.
URI sharedEditsUri = cluster.getSharedEditsDir(0, 1);
FileUtil.fullyDelete(new File(sharedEditsUri));
NameNode nn0 = cluster.getNameNode(0);
@ -107,6 +135,19 @@ public class TestFailureOfSharedDir {
ioe);
LOG.info("Got expected exception", ioe);
}
// Check that none of the edits dirs rolled, since the shared edits
// dir didn't roll. Regression test for HDFS-2874.
for (URI editsUri : cluster.getNameEditsDirs(0)) {
if (editsUri.equals(sharedEditsUri)) {
continue;
}
File editsDir = new File(editsUri.getPath());
File curDir = new File(editsDir, "current");
GenericTestUtils.assertGlobEquals(curDir,
"edits_.*",
NNStorage.getInProgressEditsFileName(1));
}
} finally {
if (cluster != null) {
cluster.shutdown();