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HDFS-4706. Do not replace root inode for disallowSnapshot. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1469122 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-04-18 01:39:12 +00:00
parent 0ad27ad3e3
commit 419fd3999c
11 changed files with 117 additions and 86 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-2802.txt
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@ -253,3 +253,5 @@ Branch-2802 Snapshot (Unreleased)
HDFS-4707. Add snapshot methods to FilterFileSystem and fix findbugs warnings.
(szetszwo)
HDFS-4706. Do not replace root inode for disallowSnapshot. (szetszwo)

12
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java
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@ -85,6 +85,7 @@ import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.primitives.SignedBytes;
import com.google.protobuf.BlockingService;
@InterfaceAudience.Private
@ -93,6 +94,17 @@ public class DFSUtil {
public static final byte[] EMPTY_BYTES = {};
/** Compare two byte arrays by lexicographical order. */
public static int compareBytes(byte[] left, byte[] right) {
if (left == null) {
left = EMPTY_BYTES;
}
if (right == null) {
right = EMPTY_BYTES;
}
return SignedBytes.lexicographicalComparator().compare(left, right);
}
private DFSUtil() { /* Hidden constructor */ }
private static final ThreadLocal<Random> RANDOM = new ThreadLocal<Random>() {
@Override

11
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshottableDirectoryStatus.java
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@ -28,7 +28,8 @@ import org.apache.hadoop.hdfs.DFSUtil;
/**
* Metadata about a snapshottable directory
*/
public class SnapshottableDirectoryStatus {
public class SnapshottableDirectoryStatus
implements Comparable<SnapshottableDirectoryStatus> {
/** Basic information of the snapshottable directory */
private HdfsFileStatus dirStatus;
@ -144,4 +145,12 @@ public class SnapshottableDirectoryStatus {
private static int maxLength(int n, Object value) {
return Math.max(n, String.valueOf(value).length());
}
@Override
public int compareTo(SnapshottableDirectoryStatus that) {
int d = DFSUtil.compareBytes(this.parentFullPath, that.parentFullPath);
return d != 0? d
: DFSUtil.compareBytes(this.dirStatus.getLocalNameInBytes(),
that.dirStatus.getLocalNameInBytes());
}
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -172,6 +172,11 @@ public class FSDirectory implements Closeable {
return getFSNamesystem().getBlockManager();
}
/** @return the root directory inode. */
public INodeDirectoryWithQuota getRoot() {
return rootDir;
}
/**
* Notify that loading of this FSDirectory is complete, and
* it is ready for use

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -3764,12 +3764,12 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
}
@Metric({ "SnapshottableDirectories", "Number of snapshottable directories" })
public long getNumSnapshottableDirs() {
public int getNumSnapshottableDirs() {
return this.snapshotManager.getNumSnapshottableDirs();
}
@Metric({ "Snapshots", "The number of snapshots" })
public long getNumSnapshots() {
public int getNumSnapshots() {
return this.snapshotManager.getNumSnapshots();
}
@ -5966,7 +5966,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
*/
void removeSnapshottableDirs(List<INodeDirectorySnapshottable> toRemove) {
if (snapshotManager != null) {
snapshotManager.removeSnapshottableDirs(toRemove);
snapshotManager.removeSnapshottable(toRemove);
}
}

9
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java
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@ -43,7 +43,6 @@ import org.apache.hadoop.util.StringUtils;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.primitives.SignedBytes;
/**
* We keep an in-memory representation of the file/block hierarchy.
@ -602,10 +601,7 @@ public abstract class INode implements Diff.Element<byte[]> {
@Override
public final int compareTo(byte[] bytes) {
final byte[] name = getLocalNameBytes();
final byte[] left = name == null? DFSUtil.EMPTY_BYTES: name;
final byte[] right = bytes == null? DFSUtil.EMPTY_BYTES: bytes;
return SignedBytes.lexicographicalComparator().compare(left, right);
return DFSUtil.compareBytes(getLocalNameBytes(), bytes);
}
@Override
@ -650,7 +646,8 @@ public abstract class INode implements Diff.Element<byte[]> {
Snapshot snapshot) {
out.print(prefix);
out.print(" ");
out.print(getLocalName());
final String name = getLocalName();
out.print(name.isEmpty()? "/": name);
out.print(" (");
out.print(getObjectString());
out.print("), ");

14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
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@ -470,16 +470,22 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
if (snapshot == null) {
out.println();
out.print(prefix);
out.print("Snapshot of ");
final String name = getLocalName();
out.print(name.isEmpty()? "/": name);
out.print(": quota=");
out.print(getSnapshotQuota());
int n = 0;
for(DirectoryDiff diff : getDiffs()) {
if (diff.isSnapshotRoot()) {
n++;
}
}
out.print(n);
out.print(n <= 1 ? " snapshot of " : " snapshots of ");
final String name = getLocalName();
out.println(name.isEmpty()? "/": name);
Preconditions.checkState(n == snapshotsByNames.size());
out.print(", #snapshot=");
out.println(n);
dumpTreeRecursively(out, prefix, new Iterable<SnapshotAndINode>() {
@Override

99
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
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@ -21,8 +21,8 @@ import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
@ -37,6 +37,8 @@ import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import org.apache.hadoop.hdfs.server.namenode.INodesInPath;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
import com.google.common.base.Preconditions;
/**
* Manage snapshottable directories and their snapshots.
*
@ -52,14 +54,13 @@ import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottab
public class SnapshotManager implements SnapshotStats {
private final FSDirectory fsdir;
private final AtomicInteger numSnapshottableDirs = new AtomicInteger();
private final AtomicInteger numSnapshots = new AtomicInteger();
private int snapshotCounter = 0;
/** All snapshottable directories in the namesystem. */
private final List<INodeDirectorySnapshottable> snapshottables
= new ArrayList<INodeDirectorySnapshottable>();
private final Map<Long, INodeDirectorySnapshottable> snapshottables
= new HashMap<Long, INodeDirectorySnapshottable>();
public SnapshotManager(final FSDirectory fsdir) {
this.fsdir = fsdir;
@ -72,26 +73,36 @@ public class SnapshotManager implements SnapshotStats {
public void setSnapshottable(final String path) throws IOException {
final INodesInPath iip = fsdir.getLastINodeInPath(path);
final INodeDirectory d = INodeDirectory.valueOf(iip.getINode(0), path);
final INodeDirectorySnapshottable s;
if (d.isSnapshottable()) {
//The directory is already a snapshottable directory.
((INodeDirectorySnapshottable)d).setSnapshotQuota(
INodeDirectorySnapshottable.SNAPSHOT_LIMIT);
return;
s = (INodeDirectorySnapshottable)d;
s.setSnapshotQuota(INodeDirectorySnapshottable.SNAPSHOT_LIMIT);
} else {
s = d.replaceSelf4INodeDirectorySnapshottable(iip.getLatestSnapshot());
}
addSnapshottable(s);
}
final INodeDirectorySnapshottable s
= d.replaceSelf4INodeDirectorySnapshottable(iip.getLatestSnapshot());
snapshottables.add(s);
numSnapshottableDirs.getAndIncrement();
}
/**
* Add a snapshottable dir into {@link #snapshottables}. Called when loading
* fsimage.
* @param dir The snapshottable dir to be added.
*/
/** Add the given snapshottable directory to {@link #snapshottables}. */
public void addSnapshottable(INodeDirectorySnapshottable dir) {
snapshottables.add(dir);
snapshottables.put(dir.getId(), dir);
}
/** Remove the given snapshottable directory from {@link #snapshottables}. */
private void removeSnapshottable(INodeDirectorySnapshottable s) {
final INodeDirectorySnapshottable removed = snapshottables.remove(s.getId());
Preconditions.checkState(s == removed);
}
/** Remove snapshottable directories from {@link #snapshottables} */
public void removeSnapshottable(List<INodeDirectorySnapshottable> toRemove) {
if (toRemove != null) {
for (INodeDirectorySnapshottable s : toRemove) {
removeSnapshottable(s);
}
}
}
/**
@ -99,8 +110,7 @@ public class SnapshotManager implements SnapshotStats {
*
* @throws SnapshotException if there are snapshots in the directory.
*/
public void resetSnapshottable(final String path
) throws IOException {
public void resetSnapshottable(final String path) throws IOException {
final INodesInPath iip = fsdir.getLastINodeInPath(path);
final INodeDirectorySnapshottable s = INodeDirectorySnapshottable.valueOf(
iip.getINode(0), path);
@ -109,10 +119,12 @@ public class SnapshotManager implements SnapshotStats {
+ "Please redo the operation after removing all the snapshots.");
}
if (s == fsdir.getRoot()) {
s.setSnapshotQuota(0);
} else {
s.replaceSelf(iip.getLatestSnapshot());
snapshottables.remove(s);
numSnapshottableDirs.getAndDecrement();
}
removeSnapshottable(s);
}
/**
@ -189,12 +201,12 @@ public class SnapshotManager implements SnapshotStats {
}
@Override
public long getNumSnapshottableDirs() {
return numSnapshottableDirs.get();
public int getNumSnapshottableDirs() {
return snapshottables.size();
}
@Override
public long getNumSnapshots() {
public int getNumSnapshots() {
return numSnapshots.get();
}
@ -204,11 +216,10 @@ public class SnapshotManager implements SnapshotStats {
*/
public void write(DataOutput out) throws IOException {
out.writeInt(snapshotCounter);
out.writeInt(numSnapshottableDirs.get());
out.writeInt(numSnapshots.get());
// write all snapshots.
for(INodeDirectorySnapshottable snapshottableDir : snapshottables) {
for(INodeDirectorySnapshottable snapshottableDir : snapshottables.values()) {
for(Snapshot s : snapshottableDir.getSnapshotsByNames()) {
s.write(out);
}
@ -222,7 +233,6 @@ public class SnapshotManager implements SnapshotStats {
public Map<Integer, Snapshot> read(DataInput in, FSImageFormat.Loader loader
) throws IOException {
snapshotCounter = in.readInt();
numSnapshottableDirs.set(in.readInt());
numSnapshots.set(in.readInt());
// read snapshots
@ -249,7 +259,7 @@ public class SnapshotManager implements SnapshotStats {
List<SnapshottableDirectoryStatus> statusList =
new ArrayList<SnapshottableDirectoryStatus>();
for (INodeDirectorySnapshottable dir : snapshottables) {
for (INodeDirectorySnapshottable dir : snapshottables.values()) {
if (userName == null || userName.equals(dir.getUserName())) {
SnapshottableDirectoryStatus status = new SnapshottableDirectoryStatus(
dir.getModificationTime(), dir.getAccessTime(),
@ -261,30 +271,9 @@ public class SnapshotManager implements SnapshotStats {
statusList.add(status);
}
}
return statusList.toArray(new SnapshottableDirectoryStatus[statusList
.size()]);
}
/**
* Remove snapshottable directories from {@link #snapshottables}
* @param toRemoveList A list of INodeDirectorySnapshottable to be removed
*/
public void removeSnapshottableDirs(
List<INodeDirectorySnapshottable> toRemoveList) {
if (toRemoveList != null) {
Iterator<INodeDirectorySnapshottable> iter = snapshottables.iterator();
while (iter.hasNext()) {
INodeDirectorySnapshottable next = iter.next();
for (INodeDirectorySnapshottable toRemove : toRemoveList) {
if (next == toRemove) {
iter.remove();
break;
}
}
}
// modify the numSnapshottableDirs metrics
numSnapshottableDirs.addAndGet(-toRemoveList.size());
}
Collections.sort(statusList);
return statusList.toArray(
new SnapshottableDirectoryStatus[statusList.size()]);
}
/**

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotStats.java
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@ -26,11 +26,11 @@ public interface SnapshotStats {
/**
* @return The number of snapshottale directories in the system
*/
public long getNumSnapshottableDirs();
public int getNumSnapshottableDirs();
/**
* @return The number of directories that have been snapshotted
*/
public long getNumSnapshots();
public int getNumSnapshots();
}

11
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestNestedSnapshots.java
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@ -106,6 +106,17 @@ public class TestNestedSnapshots {
assertFile(s1path, s2path, file1, true, true, true);
assertFile(s1path, s2path, file2, true, false, false);
final String rootStr = "/";
final Path rootPath = new Path(rootStr);
hdfs.allowSnapshot(rootStr);
print("allow snapshot " + rootStr);
final Path rootSnapshot = hdfs.createSnapshot(rootPath);
print("create snapshot " + rootSnapshot);
hdfs.deleteSnapshot(rootPath, rootSnapshot.getName());
print("delete snapshot " + rootSnapshot);
hdfs.disallowSnapshot(rootStr);
print("disallow snapshot " + rootStr);
}
private static void print(String message) throws UnresolvedLinkException {

28
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotMetrics.java
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@ -78,45 +78,45 @@ public class TestSnapshotMetrics {
*/
@Test
public void testSnapshottableDirs() throws Exception {
assertGauge("SnapshottableDirectories", 0L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 0, getMetrics(NS_METRICS));
assertCounter("AllowSnapshotOps", 0L, getMetrics(NN_METRICS));
assertCounter("DisallowSnapshotOps", 0L, getMetrics(NN_METRICS));
// Allow snapshots for directories, and check the metrics
hdfs.allowSnapshot(sub1.toString());
assertGauge("SnapshottableDirectories", 1L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 1, getMetrics(NS_METRICS));
assertCounter("AllowSnapshotOps", 1L, getMetrics(NN_METRICS));
Path sub2 = new Path(dir, "sub2");
Path file = new Path(sub2, "file");
DFSTestUtil.createFile(hdfs, file, 1024, REPLICATION, seed);
hdfs.allowSnapshot(sub2.toString());
assertGauge("SnapshottableDirectories", 2L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 2, getMetrics(NS_METRICS));
assertCounter("AllowSnapshotOps", 2L, getMetrics(NN_METRICS));
Path subsub1 = new Path(sub1, "sub1sub1");
Path subfile = new Path(subsub1, "file");
DFSTestUtil.createFile(hdfs, subfile, 1024, REPLICATION, seed);
hdfs.allowSnapshot(subsub1.toString());
assertGauge("SnapshottableDirectories", 3L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 3, getMetrics(NS_METRICS));
assertCounter("AllowSnapshotOps", 3L, getMetrics(NN_METRICS));
// Set an already snapshottable directory to snapshottable, should not
// change the metrics
hdfs.allowSnapshot(sub1.toString());
assertGauge("SnapshottableDirectories", 3L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 3, getMetrics(NS_METRICS));
// But the number of allowSnapshot operations still increases
assertCounter("AllowSnapshotOps", 4L, getMetrics(NN_METRICS));
// Disallow the snapshot for snapshottable directories, then check the
// metrics again
hdfs.disallowSnapshot(sub1.toString());
assertGauge("SnapshottableDirectories", 2L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 2, getMetrics(NS_METRICS));
assertCounter("DisallowSnapshotOps", 1L, getMetrics(NN_METRICS));
// delete subsub1, snapshottable directories should be 1
hdfs.delete(subsub1, true);
assertGauge("SnapshottableDirectories", 1L, getMetrics(NS_METRICS));
assertGauge("SnapshottableDirectories", 1, getMetrics(NS_METRICS));
// list all the snapshottable directories
SnapshottableDirectoryStatus[] status = hdfs.getSnapshottableDirListing();
@ -130,7 +130,7 @@ public class TestSnapshotMetrics {
*/
@Test
public void testSnapshots() throws Exception {
assertGauge("Snapshots", 0L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 0, getMetrics(NS_METRICS));
assertCounter("CreateSnapshotOps", 0L, getMetrics(NN_METRICS));
// Create a snapshot for a non-snapshottable directory, thus should not
@ -138,16 +138,16 @@ public class TestSnapshotMetrics {
try {
hdfs.createSnapshot(sub1, "s1");
} catch (Exception e) {}
assertGauge("Snapshots", 0L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 0, getMetrics(NS_METRICS));
assertCounter("CreateSnapshotOps", 1L, getMetrics(NN_METRICS));
// Create snapshot for sub1
hdfs.allowSnapshot(sub1.toString());
hdfs.createSnapshot(sub1, "s1");
assertGauge("Snapshots", 1L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 1, getMetrics(NS_METRICS));
assertCounter("CreateSnapshotOps", 2L, getMetrics(NN_METRICS));
hdfs.createSnapshot(sub1, "s2");
assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 2, getMetrics(NS_METRICS));
assertCounter("CreateSnapshotOps", 3L, getMetrics(NN_METRICS));
hdfs.getSnapshotDiffReport(sub1, "s1", "s2");
assertCounter("SnapshotDiffReportOps", 1L, getMetrics(NN_METRICS));
@ -158,17 +158,17 @@ public class TestSnapshotMetrics {
DFSTestUtil.createFile(hdfs, subfile, 1024, REPLICATION, seed);
hdfs.allowSnapshot(subsub1.toString());
hdfs.createSnapshot(subsub1, "s11");
assertGauge("Snapshots", 3L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 3, getMetrics(NS_METRICS));
assertCounter("CreateSnapshotOps", 4L, getMetrics(NN_METRICS));
// delete snapshot
hdfs.deleteSnapshot(sub1, "s2");
assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 2, getMetrics(NS_METRICS));
assertCounter("DeleteSnapshotOps", 1L, getMetrics(NN_METRICS));
// rename snapshot
hdfs.renameSnapshot(sub1, "s1", "NewS1");
assertGauge("Snapshots", 2L, getMetrics(NS_METRICS));
assertGauge("Snapshots", 2, getMetrics(NS_METRICS));
assertCounter("RenameSnapshotOps", 1L, getMetrics(NN_METRICS));
}
}