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HDFS-4487. Fix snapshot diff report for HDFS-4446. Contributed by Jing Zhao 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1446385 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-02-14 23:07:49 +00:00
parent d42d0860cb
commit d9e2514d21
18 changed files with 373 additions and 174 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-2802.txt
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@ -157,3 +157,5 @@ Branch-2802 Snapshot (Unreleased)
HDFS-4481. Change fsimage to support snapshot file diffs. (szetszwo)
HDFS-4500. Refactor snapshot INode methods. (szetszwo)
HDFS-4487. Fix snapshot diff report for HDFS-4446. (Jing Zhao via szetszwo)

33
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java
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@ -91,6 +91,8 @@ import com.google.protobuf.BlockingService;
public class DFSUtil {
public static final Log LOG = LogFactory.getLog(DFSUtil.class.getName());
public static final byte[] EMPTY_BYTES = {};
private DFSUtil() { /* Hidden constructor */ }
private static final ThreadLocal<Random> RANDOM = new ThreadLocal<Random>() {
@Override
@ -259,6 +261,37 @@ public class DFSUtil {
return result.toString();
}
/**
* Given a list of path components returns a byte array
*/
public static byte[] byteArray2bytes(byte[][] pathComponents) {
if (pathComponents.length == 0) {
return EMPTY_BYTES;
} else if (pathComponents.length == 1
&& (pathComponents[0] == null || pathComponents[0].length == 0)) {
return new byte[]{(byte) Path.SEPARATOR_CHAR};
}
int length = 0;
for (int i = 0; i < pathComponents.length; i++) {
length += pathComponents[i].length;
if (i < pathComponents.length - 1) {
length++; // for SEPARATOR
}
}
byte[] path = new byte[length];
int index = 0;
for (int i = 0; i < pathComponents.length; i++) {
System.arraycopy(pathComponents[i], 0, path, index,
pathComponents[i].length);
index += pathComponents[i].length;
if (i < pathComponents.length - 1) {
path[index] = (byte) Path.SEPARATOR_CHAR;
index++;
}
}
return path;
}
/** Convert an object representing a path to a string. */
public static String path2String(final Object path) {
return path == null? null

38
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotDiffReport.java
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@ -17,9 +17,12 @@
*/
package org.apache.hadoop.hdfs.protocol;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
/**
@ -75,25 +78,42 @@ public class SnapshotDiffReport {
public static class DiffReportEntry {
/** The type of the difference. */
private final DiffType type;
/** The full path of the file/directory where changes have happened */
private final String fullPath;
/**
* The relative path (related to the snapshot root) of the file/directory
* where changes have happened
*/
private final byte[] relativePath;
public DiffReportEntry(DiffType type, String fullPath) {
public DiffReportEntry(DiffType type, byte[] path) {
this.type = type;
this.fullPath = fullPath;
this.relativePath = path;
}
public DiffReportEntry(DiffType type, byte[][] pathComponents) {
this.type = type;
this.relativePath = DFSUtil.byteArray2bytes(pathComponents);
}
@Override
public String toString() {
return type.getLabel() + "\t" + fullPath;
return type.getLabel() + "\t" + getRelativePathString();
}
public DiffType getType() {
return type;
}
public String getFullPath() {
return fullPath;
public String getRelativePathString() {
String path = DFSUtil.bytes2String(relativePath);
if (path.isEmpty()) {
return ".";
} else {
return "." + Path.SEPARATOR + path;
}
}
public byte[] getRelativePath() {
return relativePath;
}
@Override
@ -104,14 +124,14 @@ public class SnapshotDiffReport {
if (other != null && other instanceof DiffReportEntry) {
DiffReportEntry entry = (DiffReportEntry) other;
return type.equals(entry.getType())
&& fullPath.equals(entry.getFullPath());
&& Arrays.equals(relativePath, entry.getRelativePath());
}
return false;
}
@Override
public int hashCode() {
return fullPath.hashCode();
return Arrays.hashCode(relativePath);
}
}

22
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java
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@ -30,6 +30,7 @@ import org.apache.hadoop.fs.CreateFlag;
import org.apache.hadoop.fs.FsServerDefaults;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
@ -299,8 +300,8 @@ public class PBHelper {
public static BlockKeyProto convert(BlockKey key) {
byte[] encodedKey = key.getEncodedKey();
ByteString keyBytes = ByteString.copyFrom(encodedKey == null ? new byte[0]
: encodedKey);
ByteString keyBytes = ByteString.copyFrom(encodedKey == null ?
DFSUtil.EMPTY_BYTES : encodedKey);
return BlockKeyProto.newBuilder().setKeyId(key.getKeyId())
.setKeyBytes(keyBytes).setExpiryDate(key.getExpiryDate()).build();
}
@ -1119,8 +1120,8 @@ public class PBHelper {
int snapshotNumber = status.getSnapshotNumber();
int snapshotQuota = status.getSnapshotQuota();
byte[] parentFullPath = status.getParentFullPath();
ByteString parentFullPathBytes = ByteString
.copyFrom(parentFullPath == null ? new byte[0] : parentFullPath);
ByteString parentFullPathBytes = ByteString.copyFrom(
parentFullPath == null ? DFSUtil.EMPTY_BYTES : parentFullPath);
HdfsFileStatusProto fs = convert(status.getDirStatus());
SnapshottableDirectoryStatusProto.Builder builder =
SnapshottableDirectoryStatusProto
@ -1411,20 +1412,23 @@ public class PBHelper {
}
DiffType type = DiffType.getTypeFromLabel(entry
.getModificationLabel());
return type != null ? new DiffReportEntry(type, entry.getFullpath())
: null;
return type == null ? null :
new DiffReportEntry(type, entry.getFullpath().toByteArray());
}
public static SnapshotDiffReportEntryProto convert(DiffReportEntry entry) {
if (entry == null) {
return null;
}
String fullPath = entry.getFullPath();
byte[] fullPath = entry.getRelativePath();
ByteString fullPathString = ByteString
.copyFrom(fullPath == null ? DFSUtil.EMPTY_BYTES : fullPath);
String modification = entry.getType().getLabel();
SnapshotDiffReportEntryProto entryProto = SnapshotDiffReportEntryProto
.newBuilder().setFullpath(fullPath).setModificationLabel(modification)
.build();
.newBuilder().setFullpath(fullPathString)
.setModificationLabel(modification).build();
return entryProto;
}

38
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -1496,11 +1496,14 @@ public class FSDirectory implements Closeable {
return fullPathName.toString();
}
/** Return the full path name of the specified inode */
static String getFullPathName(INode inode) {
// calculate the depth of this inode from root
/**
* @return the relative path of an inode from one of its ancestors,
* represented by an array of inodes.
*/
private static INode[] getRelativePathINodes(INode inode, INode ancestor) {
// calculate the depth of this inode from the ancestor
int depth = 0;
for (INode i = inode; i != null; i = i.parent) {
for (INode i = inode; i != null && !i.equals(ancestor); i = i.parent) {
depth++;
}
INode[] inodes = new INode[depth];
@ -1510,7 +1513,32 @@ public class FSDirectory implements Closeable {
inodes[depth - i - 1] = inode;
inode = inode.parent;
}
return getFullPathName(inodes, depth-1);
return inodes;
}
private static INode[] getFullPathINodes(INode inode) {
return getRelativePathINodes(inode, null);
}
/** Return the full path name of the specified inode */
static String getFullPathName(INode inode) {
INode[] inodes = getFullPathINodes(inode);
return getFullPathName(inodes, inodes.length - 1);
}
/**
* For a given inode, get its relative path from its ancestor.
* @param inode The given inode.
* @param ancestor An ancestor inode of the given inode.
* @return The relative path name represented in an array of byte array.
*/
static byte[][] getRelativePathNameBytes(INode inode, INode ancestor) {
INode[] inodes = getRelativePathINodes(inode, ancestor);
byte[][] path = new byte[inodes.length][];
for (int i = 0; i < inodes.length; i++) {
path[i] = inodes[i].getLocalNameBytes();
}
return path;
}
/**

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormat.java
View File

@ -788,7 +788,7 @@ public class FSImageFormat {
byte[] byteStore = new byte[4*HdfsConstants.MAX_PATH_LENGTH];
ByteBuffer strbuf = ByteBuffer.wrap(byteStore);
// save the root
FSImageSerialization.saveINode2Image(fsDir.rootDir, out);
FSImageSerialization.saveINode2Image(fsDir.rootDir, out, false);
// save the rest of the nodes
saveImage(strbuf, fsDir.rootDir, out, null);
// save files under construction
@ -826,7 +826,7 @@ public class FSImageFormat {
int i = 0;
for(INode child : children) {
// print all children first
FSImageSerialization.saveINode2Image(child, out);
FSImageSerialization.saveINode2Image(child, out, false);
if (child.isDirectory()) {
dirNum++;
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageSerialization.java
View File

@ -236,14 +236,15 @@ public class FSImageSerialization {
/**
* Save one inode's attributes to the image.
*/
public static void saveINode2Image(INode node, DataOutputStream out)
public static void saveINode2Image(INode node, DataOutputStream out,
boolean writeUnderConstruction)
throws IOException {
if (node.isDirectory()) {
writeINodeDirectory((INodeDirectory) node, out);
} else if (node.isSymlink()) {
writeINodeSymlink((INodeSymlink) node, out);
} else {
writeINodeFile((INodeFile) node, out, false);
writeINodeFile((INodeFile) node, out, writeUnderConstruction);
}
}

13
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java
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@ -390,6 +390,13 @@ public abstract class INode implements Diff.Element<byte[]> {
return FSDirectory.getFullPathName(this);
}
/**
* @return The full path name represented in a list of byte array
*/
public byte[][] getRelativePathNameBytes(INode ancestor) {
return FSDirectory.getRelativePathNameBytes(this, ancestor);
}
@Override
public String toString() {
return getLocalName();
@ -565,12 +572,10 @@ public abstract class INode implements Diff.Element<byte[]> {
return buf.toString();
}
public static final byte[] EMPTY_BYTES = {};
@Override
public final int compareTo(byte[] bytes) {
final byte[] left = name == null? EMPTY_BYTES: name;
final byte[] right = bytes == null? EMPTY_BYTES: bytes;
final byte[] left = name == null? DFSUtil.EMPTY_BYTES: name;
final byte[] right = bytes == null? DFSUtil.EMPTY_BYTES: bytes;
return SignedBytes.lexicographicalComparator().compare(left, right);
}

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
View File

@ -675,7 +675,8 @@ public class INodeDirectory extends INode {
}
private void updateLatestSnapshot(Snapshot s) {
if (Snapshot.ID_COMPARATOR.compare(snapshot, s) < 0) {
if (snapshot == null
|| (s != null && Snapshot.ID_COMPARATOR.compare(snapshot, s) < 0)) {
snapshot = s;
}
}

28
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/AbstractINodeDiffList.java
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@ -145,6 +145,34 @@ abstract class AbstractINodeDiffList<N extends INode,
}
}
/**
* Check if changes have happened between two snapshots.
* @param earlierSnapshot The snapshot taken earlier
* @param laterSnapshot The snapshot taken later
* @return Whether or not modifications (including diretory/file metadata
* change, file creation/deletion under the directory) have happened
* between snapshots.
*/
final boolean changedBetweenSnapshots(Snapshot earlierSnapshot,
Snapshot laterSnapshot) {
final int size = diffs.size();
int earlierDiffIndex = Collections.binarySearch(diffs, earlierSnapshot);
if (-earlierDiffIndex - 1 == size) {
// if the earlierSnapshot is after the latest SnapshotDiff stored in
// diffs, no modification happened after the earlierSnapshot
return false;
}
if (laterSnapshot != null) {
int laterDiffIndex = Collections.binarySearch(diffs, laterSnapshot);
if (laterDiffIndex == -1 || laterDiffIndex == 0) {
// if the laterSnapshot is the earliest SnapshotDiff stored in diffs, or
// before it, no modification happened before the laterSnapshot
return false;
}
}
return true;
}
/**
* @return the inode corresponding to the given snapshot.
* Note that the current inode is returned if there is no change

125
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
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@ -22,11 +22,10 @@ import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
@ -36,11 +35,12 @@ import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffType;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import org.apache.hadoop.hdfs.server.namenode.snapshot.diff.Diff;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.util.ReadOnlyList;
import org.apache.hadoop.util.Time;
import com.google.common.base.Preconditions;
import com.google.common.primitives.SignedBytes;
/**
* Directories where taking snapshots is allowed.
@ -69,6 +69,7 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
* directory.
*/
public static class SnapshotDiffInfo {
/** Compare two inodes based on their full names */
public static final Comparator<INode> INODE_COMPARATOR =
new Comparator<INode>() {
@Override
@ -76,7 +77,13 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
if (left == null) {
return right == null ? 0 : -1;
} else {
return right == null ? 1 : left.compareTo(right.getLocalNameBytes());
if (right == null) {
return 1;
} else {
int cmp = compare(left.getParent(), right.getParent());
return cmp == 0 ? SignedBytes.lexicographicalComparator().compare(
left.getLocalNameBytes(), right.getLocalNameBytes()) : cmp;
}
}
}
};
@ -88,40 +95,46 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
/** The end point of the difference */
private final Snapshot to;
/**
* A map capturing the detailed difference. Each key indicates a directory
* whose metadata or children have been changed between the two snapshots,
* while its associated value is a {@link Diff} storing the changes happened
* to the children (files).
* The list recording modified INodeFile and INodeDirectory. Sorted based on
* their names.
*/
private final SortedMap<INodeDirectoryWithSnapshot, ChildrenDiff> diffMap;
private final List<INode> diffList = new ArrayList<INode>();;
/**
* A map capturing the detailed difference about file creation/deletion.
* Each key indicates a directory whose children have been changed between
* the two snapshots, while its associated value is a {@link ChildrenDiff}
* storing the changes (creation/deletion) happened to the children (files).
*/
private final Map<INodeDirectoryWithSnapshot, ChildrenDiff> diffMap =
new HashMap<INodeDirectoryWithSnapshot, ChildrenDiff>();
public SnapshotDiffInfo(INodeDirectorySnapshottable snapshotRoot,
Snapshot start, Snapshot end) {
SnapshotDiffInfo(INodeDirectorySnapshottable snapshotRoot, Snapshot start,
Snapshot end) {
this.snapshotRoot = snapshotRoot;
this.from = start;
this.to = end;
this.diffMap = new TreeMap<INodeDirectoryWithSnapshot, ChildrenDiff>(
INODE_COMPARATOR);
}
/** Add a dir-diff pair into {@link #diffMap} */
public void addDiff(INodeDirectoryWithSnapshot dir, ChildrenDiff diff) {
/** Add a dir-diff pair */
private void addDirDiff(INodeDirectoryWithSnapshot dir, ChildrenDiff diff) {
diffMap.put(dir, diff);
int i = Collections.binarySearch(diffList, dir, INODE_COMPARATOR);
if (i < 0) {
diffList.add(-i - 1, dir);
}
}
/**
* Get the name of the given snapshot.
* @param s The given snapshot.
* @return The name of the snapshot, or an empty string if {@code s} is null
*/
private static String getSnapshotName(Snapshot s) {
return s != null ? s.getRoot().getLocalName() : "";
/** Add a modified file */
private void addFileDiff(INodeFile file) {
int i = Collections.binarySearch(diffList, file, INODE_COMPARATOR);
if (i < 0) {
diffList.add(-i - 1, file);
}
}
/** @return True if {@link #from} is earlier than {@link #to} */
private boolean isFromEarlier() {
return to == null
|| (from != null && Snapshot.ID_COMPARATOR.compare(from, to) < 0);
return Snapshot.ID_COMPARATOR.compare(from, to) < 0;
}
/**
@ -129,17 +142,20 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
* @return A {@link SnapshotDiffReport} describing the difference
*/
public SnapshotDiffReport generateReport() {
List<DiffReportEntry> diffList = new ArrayList<DiffReportEntry>();
for (Map.Entry<INodeDirectoryWithSnapshot, ChildrenDiff> entry : diffMap
.entrySet()) {
diffList.add(new DiffReportEntry(DiffType.MODIFY, entry.getKey()
.getFullPathName()));
List<DiffReportEntry> subList = entry.getValue().generateReport(
entry.getKey(), isFromEarlier());
diffList.addAll(subList);
List<DiffReportEntry> diffReportList = new ArrayList<DiffReportEntry>();
for (INode node : diffList) {
diffReportList.add(new DiffReportEntry(DiffType.MODIFY, node
.getRelativePathNameBytes(snapshotRoot)));
if (node.isDirectory()) {
ChildrenDiff dirDiff = diffMap.get(node);
List<DiffReportEntry> subList = dirDiff.generateReport(snapshotRoot,
(INodeDirectoryWithSnapshot) node, isFromEarlier());
diffReportList.addAll(subList);
}
}
return new SnapshotDiffReport(snapshotRoot.getFullPathName(),
getSnapshotName(from), getSnapshotName(to), diffList);
Snapshot.getSnapshotName(from), Snapshot.getSnapshotName(to),
diffReportList);
}
}
@ -315,7 +331,7 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
Snapshot toSnapshot = getSnapshotByName(to);
SnapshotDiffInfo diffs = new SnapshotDiffInfo(this, fromSnapshot,
toSnapshot);
computeDiffInDir(this, diffs);
computeDiffRecursively(this, diffs);
return diffs;
}
@ -343,30 +359,41 @@ public class INodeDirectorySnapshottable extends INodeDirectoryWithSnapshot {
/**
* Recursively compute the difference between snapshots under a given
* directory.
* @param dir The directory under which the diff is computed.
* directory/file.
* @param node The directory/file under which the diff is computed.
* @param diffReport data structure used to store the diff.
*/
private void computeDiffInDir(INodeDirectory dir,
private void computeDiffRecursively(INode node,
SnapshotDiffInfo diffReport) {
ChildrenDiff diff = new ChildrenDiff();
if (node instanceof INodeDirectory) {
INodeDirectory dir = (INodeDirectory) node;
if (dir instanceof INodeDirectoryWithSnapshot) {
boolean change = ((INodeDirectoryWithSnapshot) dir)
.computeDiffBetweenSnapshots(diffReport.from,
diffReport.to, diff);
INodeDirectoryWithSnapshot sdir = (INodeDirectoryWithSnapshot) dir;
boolean change = sdir.computeDiffBetweenSnapshots(
diffReport.from, diffReport.to, diff);
if (change) {
diffReport.addDiff((INodeDirectoryWithSnapshot) dir,
diff);
diffReport.addDirDiff(sdir, diff);
}
}
ReadOnlyList<INode> children = dir.getChildrenList(null);
ReadOnlyList<INode> children = dir.getChildrenList(diffReport
.isFromEarlier() ? diffReport.to : diffReport.from);
for (INode child : children) {
if (child instanceof INodeDirectory
&& diff.searchCreated(child.getLocalNameBytes()) == null) {
// Compute diff recursively for children that are directories. We do not
// need to compute diff for those contained in the created list since
// directory contained in the created list must be new created.
computeDiffInDir((INodeDirectory) child, diffReport);
if (diff.searchCreated(child.getLocalNameBytes()) == null
&& diff.searchDeleted(child.getLocalNameBytes()) == null) {
computeDiffRecursively(child, diffReport);
}
}
} else if (node instanceof FileWithSnapshot) {
FileWithSnapshot file = (FileWithSnapshot) node;
Snapshot earlierSnapshot = diffReport.isFromEarlier() ? diffReport.from
: diffReport.to;
Snapshot laterSnapshot = diffReport.isFromEarlier() ? diffReport.to
: diffReport.from;
boolean change = file.getDiffs().changedBetweenSnapshots(earlierSnapshot,
laterSnapshot);
if (change) {
diffReport.addFileDiff(file.asINodeFile());
}
}
}

71
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectoryWithSnapshot.java
View File

@ -25,7 +25,6 @@ import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffType;
import org.apache.hadoop.hdfs.server.namenode.FSImageSerialization;
@ -77,7 +76,7 @@ public class INodeDirectoryWithSnapshot extends INodeDirectoryWithQuota {
final List<INode> deleted = getDeletedList();
out.writeInt(deleted.size());
for (INode node : deleted) {
FSImageSerialization.saveINode2Image(node, out);
FSImageSerialization.saveINode2Image(node, out, true);
}
}
@ -100,52 +99,62 @@ public class INodeDirectoryWithSnapshot extends INodeDirectoryWithQuota {
/**
* Interpret the diff and generate a list of {@link DiffReportEntry}.
* @root The snapshot root of the diff report.
* @param parent The directory that the diff belongs to.
* @param fromEarlier True indicates {@code diff=later-earlier},
* False indicates {@code diff=earlier-later}
* @return A list of {@link DiffReportEntry} as the diff report.
*/
public List<DiffReportEntry> generateReport(
INodeDirectoryWithSnapshot parent, boolean fromEarlier) {
List<DiffReportEntry> mList = new ArrayList<DiffReportEntry>();
INodeDirectorySnapshottable root, INodeDirectoryWithSnapshot parent,
boolean fromEarlier) {
List<DiffReportEntry> cList = new ArrayList<DiffReportEntry>();
List<DiffReportEntry> dList = new ArrayList<DiffReportEntry>();
int c = 0, d = 0;
List<INode> created = getCreatedList();
List<INode> deleted = getDeletedList();
byte[][] parentPath = parent.getRelativePathNameBytes(root);
byte[][] fullPath = new byte[parentPath.length + 1][];
System.arraycopy(parentPath, 0, fullPath, 0, parentPath.length);
for (; c < created.size() && d < deleted.size(); ) {
INode cnode = created.get(c);
INode dnode = deleted.get(d);
if (cnode.equals(dnode)) {
mList.add(new DiffReportEntry(DiffType.MODIFY, parent
.getFullPathName() + Path.SEPARATOR + cnode.getLocalName()));
fullPath[fullPath.length - 1] = cnode.getLocalNameBytes();
if (cnode.isSymlink() && dnode.isSymlink()) {
dList.add(new DiffReportEntry(DiffType.MODIFY, fullPath));
} else {
// must be the case: delete first and then create an inode with the
// same name
cList.add(new DiffReportEntry(DiffType.CREATE, fullPath));
dList.add(new DiffReportEntry(DiffType.DELETE, fullPath));
}
c++;
d++;
} else if (cnode.compareTo(dnode.getLocalNameBytes()) < 0) {
fullPath[fullPath.length - 1] = cnode.getLocalNameBytes();
cList.add(new DiffReportEntry(fromEarlier ? DiffType.CREATE
: DiffType.DELETE, parent.getFullPathName() + Path.SEPARATOR
+ cnode.getLocalName()));
: DiffType.DELETE, fullPath));
c++;
} else {
fullPath[fullPath.length - 1] = dnode.getLocalNameBytes();
dList.add(new DiffReportEntry(fromEarlier ? DiffType.DELETE
: DiffType.CREATE, parent.getFullPathName() + Path.SEPARATOR
+ dnode.getLocalName()));
: DiffType.CREATE, fullPath));
d++;
}
}
for (; d < deleted.size(); d++) {
fullPath[fullPath.length - 1] = deleted.get(d).getLocalNameBytes();
dList.add(new DiffReportEntry(fromEarlier ? DiffType.DELETE
: DiffType.CREATE, parent.getFullPathName() + Path.SEPARATOR
+ deleted.get(d).getLocalName()));
: DiffType.CREATE, fullPath));
}
for (; c < created.size(); c++) {
fullPath[fullPath.length - 1] = created.get(c).getLocalNameBytes();
cList.add(new DiffReportEntry(fromEarlier ? DiffType.CREATE
: DiffType.DELETE, parent.getFullPathName() + Path.SEPARATOR
+ created.get(c).getLocalName()));
: DiffType.DELETE, fullPath));
}
cList.addAll(dList);
cList.addAll(mList);
return cList;
dList.addAll(cList);
return dList;
}
}
@ -329,35 +338,27 @@ public class INodeDirectoryWithSnapshot extends INodeDirectoryWithQuota {
Snapshot toSnapshot, ChildrenDiff diff) {
Snapshot earlierSnapshot = fromSnapshot;
Snapshot laterSnapshot = toSnapshot;
if (fromSnapshot == null
|| (toSnapshot != null && Snapshot.ID_COMPARATOR.compare(fromSnapshot,
toSnapshot) > 0)) {
if (Snapshot.ID_COMPARATOR.compare(fromSnapshot, toSnapshot) > 0) {
earlierSnapshot = toSnapshot;
laterSnapshot = fromSnapshot;
}
boolean modified = diffs.changedBetweenSnapshots(earlierSnapshot,
laterSnapshot);
if (!modified) {
return false;
}
final List<DirectoryDiff> difflist = diffs.asList();
final int size = difflist.size();
int earlierDiffIndex = Collections.binarySearch(difflist, earlierSnapshot);
if (earlierDiffIndex < 0 && (-earlierDiffIndex - 1) == size) {
// if the earlierSnapshot is after the latest SnapshotDiff stored in diffs,
// no modification happened after the earlierSnapshot
return false;
}
int laterDiffIndex = size;
if (laterSnapshot != null) {
laterDiffIndex = Collections.binarySearch(difflist, laterSnapshot);
if (laterDiffIndex == -1 || laterDiffIndex == 0) {
// if the endSnapshot is the earliest SnapshotDiff stored in
// diffs, or before it, no modification happened before the endSnapshot
return false;
}
}
int laterDiffIndex = laterSnapshot == null ? size : Collections
.binarySearch(difflist, laterSnapshot);
earlierDiffIndex = earlierDiffIndex < 0 ? (-earlierDiffIndex - 1)
: earlierDiffIndex;
laterDiffIndex = laterDiffIndex < 0 ? (-laterDiffIndex - 1)
: laterDiffIndex;
boolean dirMetadataChanged = false;
INodeDirectory dirCopy = null;
for (int i = earlierDiffIndex; i < laterDiffIndex; i++) {

22
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/Snapshot.java
View File

@ -33,15 +33,19 @@ import org.apache.hadoop.hdfs.util.ReadOnlyList;
/** Snapshot of a sub-tree in the namesystem. */
@InterfaceAudience.Private
public class Snapshot implements Comparable<byte[]> {
/** Compare snapshot IDs with null <= s for any snapshot s. */
/**
* Compare snapshot IDs. Null indicates the current status thus is greater
* than non-null snapshots.
*/
public static final Comparator<Snapshot> ID_COMPARATOR
= new Comparator<Snapshot>() {
@Override
public int compare(Snapshot left, Snapshot right) {
// null means the current state, thus should be the largest
if (left == null) {
return right == null? 0: -1;
return right == null? 0: 1;
} else {
return right == null? 1: left.id - right.id;
return right == null? -1: left.id - right.id;
}
}
};
@ -52,7 +56,8 @@ public class Snapshot implements Comparable<byte[]> {
for(; inode != null; inode = inode.getParent()) {
if (inode instanceof INodeDirectorySnapshottable) {
final Snapshot s = ((INodeDirectorySnapshottable)inode).getLastSnapshot();
if (ID_COMPARATOR.compare(latest, s) < 0) {
if (latest == null
|| (s != null && ID_COMPARATOR.compare(latest, s) < 0)) {
latest = s;
}
}
@ -60,6 +65,15 @@ public class Snapshot implements Comparable<byte[]> {
return latest;
}
/**
* Get the name of the given snapshot.
* @param s The given snapshot.
* @return The name of the snapshot, or an empty string if {@code s} is null
*/
public static String getSnapshotName(Snapshot s) {
return s != null ? s.getRoot().getLocalName() : "";
}
/** The root directory of the snapshot. */
public class Root extends INodeDirectory {
Root(INodeDirectory other) {

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotFSImageFormat.java
View File

@ -193,7 +193,7 @@ public class SnapshotFSImageFormat {
int deletedSize = in.readInt();
List<INode> deletedList = new ArrayList<INode>(deletedSize);
for (int i = 0; i < deletedSize; i++) {
final INode deleted = loader.loadINodeWithLocalName(false, in);
final INode deleted = loader.loadINodeWithLocalName(true, in);
deletedList.add(deleted);
// set parent: the parent field of an INode in the deleted list is not
// useful, but set the parent here to be consistent with the original

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
View File

@ -28,7 +28,6 @@ import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory.INodesInPath;
@ -225,8 +224,9 @@ public class SnapshotManager implements SnapshotStats {
dir.getModificationTime(), dir.getAccessTime(),
dir.getFsPermission(), dir.getUserName(), dir.getGroupName(),
dir.getLocalNameBytes(), dir.getId(), dir.getNumSnapshots(),
dir.getSnapshotQuota(), dir.getParent() == null ? INode.EMPTY_BYTES
: DFSUtil.string2Bytes(dir.getParent().getFullPathName()));
dir.getSnapshotQuota(), dir.getParent() == null ?
DFSUtil.EMPTY_BYTES :
DFSUtil.string2Bytes(dir.getParent().getFullPathName()));
statusList.add(status);
}
}

2
hadoop-hdfs-project/hadoop-hdfs/src/main/proto/hdfs.proto
View File

@ -234,7 +234,7 @@ message SnapshottableDirectoryListingProto {
* Snapshot diff report entry
*/
message SnapshotDiffReportEntryProto {
required string fullpath = 1;
required bytes fullpath = 1;
required string modificationLabel = 2;
}

4
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestNestedSnapshots.java
View File

@ -185,8 +185,8 @@ public class TestNestedSnapshots {
Assert.assertEquals(0, Snapshot.ID_COMPARATOR.compare(null, null));
for(Snapshot s : snapshots) {
Assert.assertTrue(Snapshot.ID_COMPARATOR.compare(null, s) < 0);
Assert.assertTrue(Snapshot.ID_COMPARATOR.compare(s, null) > 0);
Assert.assertTrue(Snapshot.ID_COMPARATOR.compare(null, s) > 0);
Assert.assertTrue(Snapshot.ID_COMPARATOR.compare(s, null) < 0);
for(Snapshot t : snapshots) {
final int expected = s.getRoot().getLocalName().compareTo(

119
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotDiffReport.java
View File

@ -27,6 +27,7 @@ import java.util.HashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
@ -43,6 +44,7 @@ import org.junit.Test;
public class TestSnapshotDiffReport {
protected static final long seed = 0;
protected static final short REPLICATION = 3;
protected static final short REPLICATION_1 = 2;
protected static final long BLOCKSIZE = 1024;
public static final int SNAPSHOTNUMBER = 10;
@ -92,14 +94,10 @@ public class TestSnapshotDiffReport {
Path file13 = new Path(modifyDir, "file13");
Path file14 = new Path(modifyDir, "file14");
Path file15 = new Path(modifyDir, "file15");
DFSTestUtil.createFile(hdfs, file10, BLOCKSIZE, (short) (REPLICATION - 1),
seed);
DFSTestUtil.createFile(hdfs, file11, BLOCKSIZE, (short) (REPLICATION - 1),
seed);
DFSTestUtil.createFile(hdfs, file12, BLOCKSIZE, (short) (REPLICATION - 1),
seed);
DFSTestUtil.createFile(hdfs, file13, BLOCKSIZE, (short) (REPLICATION - 1),
seed);
DFSTestUtil.createFile(hdfs, file10, BLOCKSIZE, REPLICATION_1, seed);
DFSTestUtil.createFile(hdfs, file11, BLOCKSIZE, REPLICATION_1, seed);
DFSTestUtil.createFile(hdfs, file12, BLOCKSIZE, REPLICATION_1, seed);
DFSTestUtil.createFile(hdfs, file13, BLOCKSIZE, REPLICATION_1, seed);
// create snapshot
for (Path snapshotDir : snapshotDirs) {
hdfs.allowSnapshot(snapshotDir.toString());
@ -161,18 +159,17 @@ public class TestSnapshotDiffReport {
} else if (entry.getType() == DiffType.DELETE) {
assertTrue(report.getDiffList().contains(entry));
assertTrue(inverseReport.getDiffList().contains(
new DiffReportEntry(DiffType.CREATE, entry.getFullPath())));
new DiffReportEntry(DiffType.CREATE, entry.getRelativePath())));
} else if (entry.getType() == DiffType.CREATE) {
assertTrue(report.getDiffList().contains(entry));
assertTrue(inverseReport.getDiffList().contains(
new DiffReportEntry(DiffType.DELETE, entry.getFullPath())));
new DiffReportEntry(DiffType.DELETE, entry.getRelativePath())));
}
}
}
/** Test the computation and representation of diff between snapshots */
// TODO: fix diff report
// @Test
@Test
public void testDiffReport() throws Exception {
Path subsub1 = new Path(sub1, "subsub1");
Path subsubsub1 = new Path(subsub1, "subsubsub1");
@ -203,56 +200,94 @@ public class TestSnapshotDiffReport {
assertEquals(0, report.getDiffList().size());
verifyDiffReport(sub1, "s0", "s2",
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1"),
new DiffReportEntry(DiffType.CREATE, "/TestSnapshot/sub1/file15"),
new DiffReportEntry(DiffType.DELETE, "/TestSnapshot/sub1/file12"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file11"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file13"));
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("")),
new DiffReportEntry(DiffType.CREATE, DFSUtil.string2Bytes("file15")),
new DiffReportEntry(DiffType.DELETE, DFSUtil.string2Bytes("file12")),
new DiffReportEntry(DiffType.DELETE, DFSUtil.string2Bytes("file11")),
new DiffReportEntry(DiffType.CREATE, DFSUtil.string2Bytes("file11")),
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("file13")));
verifyDiffReport(sub1, "s0", "s5",
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1"),
new DiffReportEntry(DiffType.CREATE, "/TestSnapshot/sub1/file15"),
new DiffReportEntry(DiffType.DELETE, "/TestSnapshot/sub1/file12"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file10"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file11"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file13"),
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("")),
new DiffReportEntry(DiffType.CREATE, DFSUtil.string2Bytes("file15")),
new DiffReportEntry(DiffType.DELETE, DFSUtil.string2Bytes("file12")),
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("file10")),
new DiffReportEntry(DiffType.DELETE, DFSUtil.string2Bytes("file11")),
new DiffReportEntry(DiffType.CREATE, DFSUtil.string2Bytes("file11")),
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("file13")),
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1"),
DFSUtil.string2Bytes("subsub1/subsubsub1")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file10"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file10")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file11"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file13"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file13")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file15"));
DFSUtil.string2Bytes("subsub1/subsubsub1/file15")));
verifyDiffReport(sub1, "s2", "s5",
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1"),
new DiffReportEntry(DiffType.MODIFY, "/TestSnapshot/sub1/file10"),
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("file10")),
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1"),
DFSUtil.string2Bytes("subsub1/subsubsub1")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file10"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file10")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file11"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file13"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file13")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file15"));
DFSUtil.string2Bytes("subsub1/subsubsub1/file15")));
verifyDiffReport(sub1, "s3", "",
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1"),
DFSUtil.string2Bytes("subsub1/subsubsub1")),
new DiffReportEntry(DiffType.CREATE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file15"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file15")),
new DiffReportEntry(DiffType.DELETE,
"/TestSnapshot/sub1/subsub1/subsubsub1/file12"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file12")),
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1/file10"),
DFSUtil.string2Bytes("subsub1/subsubsub1/file10")),
new DiffReportEntry(DiffType.DELETE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.CREATE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1/file11"),
new DiffReportEntry(DiffType.MODIFY,
"/TestSnapshot/sub1/subsub1/subsubsub1/file13"));
DFSUtil.string2Bytes("subsub1/subsubsub1/file13")));
}
/**
* Make changes under a sub-directory, then delete the sub-directory. Make
* sure the diff report computation correctly retrieve the diff from the
* deleted sub-directory.
*/
@Test
public void testDiffReport2() throws Exception {
Path subsub1 = new Path(sub1, "subsub1");
Path subsubsub1 = new Path(subsub1, "subsubsub1");
hdfs.mkdirs(subsubsub1);
modifyAndCreateSnapshot(subsubsub1, new Path[]{sub1});
// delete subsub1
hdfs.delete(subsub1, true);
// check diff report between s0 and s2
verifyDiffReport(sub1, "s0", "s2",
new DiffReportEntry(DiffType.MODIFY,
DFSUtil.string2Bytes("subsub1/subsubsub1")),
new DiffReportEntry(DiffType.CREATE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file15")),
new DiffReportEntry(DiffType.DELETE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file12")),
new DiffReportEntry(DiffType.DELETE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.CREATE,
DFSUtil.string2Bytes("subsub1/subsubsub1/file11")),
new DiffReportEntry(DiffType.MODIFY,
DFSUtil.string2Bytes("subsub1/subsubsub1/file13")));
// check diff report between s0 and the current status
verifyDiffReport(sub1, "s0", "",
new DiffReportEntry(DiffType.MODIFY, DFSUtil.string2Bytes("")),
new DiffReportEntry(DiffType.DELETE, DFSUtil.string2Bytes("subsub1")));
}
}