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HDFS-4098. Add FileWithSnapshot, INodeFileUnderConstructionWithSnapshot and INodeFileUnderConstructionSnapshot for supporting append to snapshotted files. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1434966 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-01-17 23:38:30 +00:00
parent 7856221d4a
commit b71d386890
16 changed files with 477 additions and 228 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-2802.txt
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@ -109,3 +109,7 @@ Branch-2802 Snapshot (Unreleased)
HDFS-4407. Change INodeDirectoryWithSnapshot.Diff.combinePostDiff(..) to
merge-sort like and keep the postDiff parameter unmodified. (szetszwo)
HDFS-4098. Add FileWithSnapshot, INodeFileUnderConstructionWithSnapshot and
INodeFileUnderConstructionSnapshot for supporting append to snapshotted files.
(szetszwo)

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java
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@ -324,7 +324,7 @@ private long applyEditLogOp(FSEditLogOp op, FSDirectory fsDir,
if (oldFile.isUnderConstruction()) {
INodeFileUnderConstruction ucFile = (INodeFileUnderConstruction) oldFile;
fsNamesys.leaseManager.removeLeaseWithPrefixPath(addCloseOp.path);
INodeFile newFile = ucFile.convertToInodeFile(ucFile.getModificationTime());
INodeFile newFile = ucFile.toINodeFile(ucFile.getModificationTime());
fsDir.unprotectedReplaceINodeFile(addCloseOp.path, ucFile, newFile,
iip.getLatestSnapshot());
}

31
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -178,7 +178,7 @@
import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMBean;
import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithLink;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithSnapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager;
import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
@ -1357,10 +1357,11 @@ private LocatedBlocks getBlockLocationsUpdateTimes(String src,
doAccessTime = false;
}
long now = now();
final INodesInPath iip = dir.getMutableINodesInPath(src);
final INodesInPath iip = dir.getINodesInPath(src);
final INodeFile inode = INodeFile.valueOf(iip.getLastINode(), src);
if (doAccessTime && isAccessTimeSupported()) {
if (!iip.isSnapshot() //snapshots are readonly, so don't update atime.
&& doAccessTime && isAccessTimeSupported()) {
final long now = now();
if (now <= inode.getAccessTime() + getAccessTimePrecision()) {
// if we have to set access time but we only have the readlock, then
// restart this entire operation with the writeLock.
@ -1488,7 +1489,7 @@ private void concatInternal(String target, String [] srcs)
throw new HadoopIllegalArgumentException("concat: target file "
+ target + " is empty");
}
if (trgInode instanceof INodeFileWithLink) {
if (trgInode instanceof INodeFileWithSnapshot) {
throw new HadoopIllegalArgumentException("concat: target file "
+ target + " is in a snapshot");
}
@ -1981,18 +1982,12 @@ private LocatedBlock startFileInternal(String src,
LocatedBlock prepareFileForWrite(String src, INodeFile file,
String leaseHolder, String clientMachine, DatanodeDescriptor clientNode,
boolean writeToEditLog, Snapshot latestSnapshot) throws IOException {
//TODO SNAPSHOT: INodeFileUnderConstruction with link
INodeFileUnderConstruction cons = new INodeFileUnderConstruction(
file.getId(),
file.getLocalNameBytes(),
file.getFileReplication(),
file.getModificationTime(),
file.getPreferredBlockSize(),
file.getBlocks(),
file.getPermissionStatus(),
leaseHolder,
clientMachine,
clientNode);
if (latestSnapshot != null) {
file = (INodeFile)file.recordModification(latestSnapshot).left;
}
final INodeFileUnderConstruction cons = file.toUnderConstruction(
leaseHolder, clientMachine, clientNode);
dir.replaceINodeFile(src, file, cons, latestSnapshot);
leaseManager.addLease(cons.getClientName(), src);
@ -3301,7 +3296,7 @@ private void finalizeINodeFileUnderConstruction(String src,
// The file is no longer pending.
// Create permanent INode, update blocks
INodeFile newFile = pendingFile.convertToInodeFile(now());
final INodeFile newFile = pendingFile.toINodeFile(now());
dir.replaceINodeFile(src, pendingFile, newFile, latestSnapshot);
// close file and persist block allocations for this file

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java
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@ -508,7 +508,7 @@ public long getAccessTime() {
/**
* Set last access time of inode.
*/
INode setAccessTime(long atime, Snapshot latest) {
public INode setAccessTime(long atime, Snapshot latest) {
Pair<? extends INode, ? extends INode> pair = recordModification(latest);
INode nodeToUpdate = pair != null ? pair.left : this;
nodeToUpdate.accessTime = atime;

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
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@ -32,7 +32,7 @@
import org.apache.hadoop.hdfs.protocol.UnresolvedPathException;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectoryWithSnapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithLink;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithSnapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotAccessControlException;
import org.apache.hadoop.hdfs.util.ReadOnlyList;
@ -216,13 +216,13 @@ private final void replaceSelf(INodeDirectory newDir) {
oldDir.setParent(null);
}
/** Replace a child {@link INodeFile} with an {@link INodeFileWithLink}. */
INodeFileWithLink replaceINodeFile(final INodeFile child) {
/** Replace a child {@link INodeFile} with an {@link INodeFileWithSnapshot}. */
INodeFileWithSnapshot replaceINodeFile(final INodeFile child) {
assertChildrenNonNull();
Preconditions.checkArgument(!(child instanceof INodeFileWithLink),
Preconditions.checkArgument(!(child instanceof INodeFileWithSnapshot),
"Child file is already an INodeFileWithLink, child=" + child);
final INodeFileWithLink newChild = new INodeFileWithLink(child);
final INodeFileWithSnapshot newChild = new INodeFileWithSnapshot(child);
final int i = searchChildrenForExistingINode(newChild);
children.set(i, newChild);
return newChild;

20
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
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@ -28,10 +28,11 @@
import org.apache.hadoop.hdfs.server.blockmanagement.BlockCollection;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileSnapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithLink;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import com.google.common.base.Preconditions;
/** I-node for closed file. */
@InterfaceAudience.Private
public class INodeFile extends INode implements BlockCollection {
@ -111,7 +112,7 @@ protected INodeFile(INodeFile that) {
}
@Override
public Pair<INodeFileWithLink, INodeFileSnapshot> createSnapshotCopy() {
public Pair<? extends INodeFile, ? extends INodeFile> createSnapshotCopy() {
return parent.replaceINodeFile(this).createSnapshotCopy();
}
@ -121,6 +122,17 @@ public final boolean isFile() {
return true;
}
/** Convert this file to an {@link INodeFileUnderConstruction}. */
public INodeFileUnderConstruction toUnderConstruction(
String clientName,
String clientMachine,
DatanodeDescriptor clientNode) {
Preconditions.checkArgument(!(this instanceof INodeFileUnderConstruction),
"file is already an INodeFileUnderConstruction");
return new INodeFileUnderConstruction(this,
clientName, clientMachine, clientNode);
}
/**
* Set the {@link FsPermission} of this {@link INodeFile}.
* Since this is a file,
@ -141,7 +153,7 @@ public short getBlockReplication() {
return getFileReplication();
}
protected void setFileReplication(short replication, Snapshot latest) {
public void setFileReplication(short replication, Snapshot latest) {
if (latest != null) {
final Pair<? extends INode, ? extends INode> p = recordModification(latest);
if (p != null) {

51
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFileUnderConstruction.java
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@ -30,6 +30,8 @@
import org.apache.hadoop.hdfs.server.blockmanagement.MutableBlockCollection;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import com.google.common.base.Preconditions;
/**
* I-node for file being written.
*/
@ -78,7 +80,17 @@ public static INodeFileUnderConstruction valueOf(INode inode, String path
this.clientNode = clientNode;
}
String getClientName() {
protected INodeFileUnderConstruction(final INodeFile that,
final String clientName,
final String clientMachine,
final DatanodeDescriptor clientNode) {
super(that);
this.clientName = clientName;
this.clientMachine = clientMachine;
this.clientNode = clientNode;
}
public String getClientName() {
return clientName;
}
@ -86,11 +98,11 @@ void setClientName(String clientName) {
this.clientName = clientName;
}
String getClientMachine() {
public String getClientMachine() {
return clientMachine;
}
DatanodeDescriptor getClientNode() {
public DatanodeDescriptor getClientNode() {
return clientNode;
}
@ -102,31 +114,28 @@ public boolean isUnderConstruction() {
return true;
}
//
// converts a INodeFileUnderConstruction into a INodeFile
// use the modification time as the access time
//
INodeFile convertToInodeFile(long mtime) {
assert allBlocksComplete() : "Can't finalize inode " + this
+ " since it contains non-complete blocks! Blocks are "
+ Arrays.asList(getBlocks());
//TODO SNAPSHOT: may convert to INodeFileWithLink
/**
* Converts an INodeFileUnderConstruction to an INodeFile.
* The original modification time is used as the access time.
* The new modification is the specified mtime.
*/
protected INodeFile toINodeFile(long mtime) {
assertAllBlocksComplete();
return new INodeFile(getId(), getLocalNameBytes(), getPermissionStatus(),
mtime, getModificationTime(),
getBlocks(), getFileReplication(), getPreferredBlockSize());
}
/**
* @return true if all of the blocks in this file are marked as completed.
*/
private boolean allBlocksComplete() {
for (BlockInfo b : getBlocks()) {
if (!b.isComplete()) {
return false;
/** Assert all blocks are complete. */
protected void assertAllBlocksComplete() {
final BlockInfo[] blocks = getBlocks();
for (int i = 0; i < blocks.length; i++) {
Preconditions.checkState(blocks[i].isComplete(), "Failed to finalize"
+ " %s %s since blocks[%s] is non-complete, where blocks=%s.",
getClass().getSimpleName(), this, i, Arrays.asList(getBlocks()));
}
}
return true;
}
/**
* Remove a block from the block list. This block should be

166
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithSnapshot.java Normal file
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@ -0,0 +1,166 @@
/**
* 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.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapINodeUpdateEntry;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
import com.google.common.base.Preconditions;
/**
* {@link INodeFile} with a link to the next element.
* The link of all the snapshot files and the original file form a circular
* linked list so that all elements are accessible by any of the elements.
*/
@InterfaceAudience.Private
public interface FileWithSnapshot {
/** @return the {@link INodeFile} view of this object. */
public INodeFile asINodeFile();
/** @return the next element. */
public FileWithSnapshot getNext();
/** Set the next element. */
public void setNext(FileWithSnapshot next);
/** Insert inode to the circular linked list. */
public void insert(FileWithSnapshot inode);
/** Utility methods for the classes which implement the interface. */
static class Util {
/** Replace the old file with the new file in the circular linked list. */
static void replace(FileWithSnapshot oldFile, FileWithSnapshot newFile) {
//set next element
FileWithSnapshot i = oldFile.getNext();
newFile.setNext(i);
oldFile.setNext(null);
//find previous element and update it
for(; i.getNext() != oldFile; i = i.getNext());
i.setNext(newFile);
}
/**
* @return the max file replication of the elements
* in the circular linked list.
*/
static short getBlockReplication(final FileWithSnapshot file) {
short max = file.asINodeFile().getFileReplication();
// i may be null since next will be set to null when the INode is deleted
for(FileWithSnapshot i = file.getNext();
i != file && i != null;
i = i.getNext()) {
final short replication = i.asINodeFile().getFileReplication();
if (replication > max) {
max = replication;
}
}
return max;
}
/**
* Remove the current inode from the circular linked list.
* If some blocks at the end of the block list no longer belongs to
* any other inode, collect them and update the block list.
*/
static int collectSubtreeBlocksAndClear(final FileWithSnapshot file,
final BlocksMapUpdateInfo info) {
final FileWithSnapshot next = file.getNext();
Preconditions.checkState(next != file, "this is the only remaining inode.");
// There are other inode(s) using the blocks.
// Compute max file size excluding this and find the last inode.
long max = next.asINodeFile().computeFileSize(true);
short maxReplication = next.asINodeFile().getFileReplication();
FileWithSnapshot last = next;
for(FileWithSnapshot i = next.getNext(); i != file; i = i.getNext()) {
final long size = i.asINodeFile().computeFileSize(true);
if (size > max) {
max = size;
}
final short rep = i.asINodeFile().getFileReplication();
if (rep > maxReplication) {
maxReplication = rep;
}
last = i;
}
collectBlocksBeyondMaxAndClear(file, max, info);
// remove this from the circular linked list.
last.setNext(next);
// Set the replication of the current INode to the max of all the other
// linked INodes, so that in case the current INode is retrieved from the
// blocksMap before it is removed or updated, the correct replication
// number can be retrieved.
file.asINodeFile().setFileReplication(maxReplication, null);
file.setNext(null);
// clear parent
file.asINodeFile().setParent(null);
return 1;
}
static void collectBlocksBeyondMaxAndClear(final FileWithSnapshot file,
final long max, final BlocksMapUpdateInfo info) {
final BlockInfo[] oldBlocks = file.asINodeFile().getBlocks();
if (oldBlocks != null) {
//find the minimum n such that the size of the first n blocks > max
int n = 0;
for(long size = 0; n < oldBlocks.length && max > size; n++) {
size += oldBlocks[n].getNumBytes();
}
// Replace the INode for all the remaining blocks in blocksMap
final FileWithSnapshot next = file.getNext();
final BlocksMapINodeUpdateEntry entry = new BlocksMapINodeUpdateEntry(
file.asINodeFile(), next.asINodeFile());
if (info != null) {
for (int i = 0; i < n; i++) {
info.addUpdateBlock(oldBlocks[i], entry);
}
}
// starting from block n, the data is beyond max.
if (n < oldBlocks.length) {
// resize the array.
final BlockInfo[] newBlocks;
if (n == 0) {
newBlocks = null;
} else {
newBlocks = new BlockInfo[n];
System.arraycopy(oldBlocks, 0, newBlocks, 0, n);
}
for(FileWithSnapshot i = next; i != file; i = i.getNext()) {
i.asINodeFile().setBlocks(newBlocks);
}
// collect the blocks beyond max.
if (info != null) {
for(; n < oldBlocks.length; n++) {
info.addDeleteBlock(oldBlocks[n]);
}
}
}
file.asINodeFile().setBlocks(null);
}
}
}
}

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileSnapshot.java
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@ -23,11 +23,11 @@
* INode representing a snapshot of a file.
*/
@InterfaceAudience.Private
public class INodeFileSnapshot extends INodeFileWithLink {
public class INodeFileSnapshot extends INodeFileWithSnapshot {
/** The file size at snapshot creation time. */
final long size;
INodeFileSnapshot(INodeFileWithLink f) {
INodeFileSnapshot(INodeFileWithSnapshot f) {
super(f);
this.size = f.computeFileSize(true);
f.insert(this);

44
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionSnapshot.java Normal file
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@ -0,0 +1,44 @@
/**
* 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.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.namenode.INodeFileUnderConstruction;
/**
* INode representing a snapshot of an {@link INodeFileUnderConstruction}.
*/
@InterfaceAudience.Private
public class INodeFileUnderConstructionSnapshot
extends INodeFileUnderConstructionWithSnapshot {
/** The file size at snapshot creation time. */
final long size;
INodeFileUnderConstructionSnapshot(INodeFileUnderConstructionWithSnapshot f) {
super(f, f.getClientName(), f.getClientMachine(), f.getClientNode());
this.size = f.computeFileSize(true);
f.insert(this);
}
@Override
public long computeFileSize(boolean includesBlockInfoUnderConstruction) {
//ignore includesBlockInfoUnderConstruction
//since files in a snapshot are considered as closed.
return size;
}
}

96
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionWithSnapshot.java Normal file
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@ -0,0 +1,96 @@
/**
* 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.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeFileUnderConstruction;
/**
* Represent an {@link INodeFileUnderConstruction} that is snapshotted.
* Note that snapshot files are represented by
* {@link INodeFileUnderConstructionSnapshot}.
*/
@InterfaceAudience.Private
public class INodeFileUnderConstructionWithSnapshot
extends INodeFileUnderConstruction implements FileWithSnapshot {
private FileWithSnapshot next;
INodeFileUnderConstructionWithSnapshot(final FileWithSnapshot f,
final String clientName,
final String clientMachine,
final DatanodeDescriptor clientNode) {
super(f.asINodeFile(), clientName, clientMachine, clientNode);
}
@Override
protected INodeFileWithSnapshot toINodeFile(final long mtime) {
assertAllBlocksComplete();
final long atime = getModificationTime();
final INodeFileWithSnapshot f = new INodeFileWithSnapshot(this);
f.setModificationTime(mtime, null);
f.setAccessTime(atime, null);
Util.replace(this, f);
return f;
}
@Override
public Pair<? extends INodeFileUnderConstruction,
INodeFileUnderConstructionSnapshot> createSnapshotCopy() {
return new Pair<INodeFileUnderConstructionWithSnapshot,
INodeFileUnderConstructionSnapshot>(
this, new INodeFileUnderConstructionSnapshot(this));
}
@Override
public INodeFile asINodeFile() {
return this;
}
@Override
public FileWithSnapshot getNext() {
return next;
}
@Override
public void setNext(FileWithSnapshot next) {
this.next = next;
}
@Override
public void insert(FileWithSnapshot inode) {
inode.setNext(this.getNext());
this.setNext(inode);
}
@Override
public short getBlockReplication() {
return Util.getBlockReplication(this);
}
@Override
public int collectSubtreeBlocksAndClear(BlocksMapUpdateInfo info) {
if (next == null || next == this) {
// this is the only remaining inode.
return super.collectSubtreeBlocksAndClear(info);
} else {
return Util.collectSubtreeBlocksAndClear(this, info);
}
}
}

166
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithLink.java
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@ -1,166 +0,0 @@
/**
* 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.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
/**
* INodeFile with a link to the next element.
* This class is used to represent the original file that is snapshotted.
* The snapshot files are represented by {@link INodeFileSnapshot}.
* The link of all the snapshot files and the original file form a circular
* linked list so that all elements are accessible by any of the elements.
*/
@InterfaceAudience.Private
public class INodeFileWithLink extends INodeFile {
private INodeFileWithLink next;
public INodeFileWithLink(INodeFile f) {
super(f);
next = this;
}
@Override
public Pair<INodeFileWithLink, INodeFileSnapshot> createSnapshotCopy() {
return new Pair<INodeFileWithLink, INodeFileSnapshot>(this,
new INodeFileSnapshot(this));
}
void setNext(INodeFileWithLink next) {
this.next = next;
}
INodeFileWithLink getNext() {
return next;
}
/** Insert inode to the circular linked list. */
void insert(INodeFileWithLink inode) {
inode.setNext(this.getNext());
this.setNext(inode);
}
/**
* @return the max file replication of the elements
* in the circular linked list.
*/
@Override
public short getBlockReplication() {
short max = getFileReplication();
// i may be null since next will be set to null when the INode is deleted
for(INodeFileWithLink i = next; i != this && i != null; i = i.getNext()) {
final short replication = i.getFileReplication();
if (replication > max) {
max = replication;
}
}
return max;
}
/**
* {@inheritDoc}
*
* Remove the current inode from the circular linked list.
* If some blocks at the end of the block list no longer belongs to
* any other inode, collect them and update the block list.
*/
@Override
public int collectSubtreeBlocksAndClear(BlocksMapUpdateInfo info) {
if (next == this) {
// this is the only remaining inode.
super.collectSubtreeBlocksAndClear(info);
} else {
// There are other inode(s) using the blocks.
// Compute max file size excluding this and find the last inode.
long max = next.computeFileSize(true);
short maxReplication = next.getFileReplication();
INodeFileWithLink last = next;
for(INodeFileWithLink i = next.getNext(); i != this; i = i.getNext()) {
final long size = i.computeFileSize(true);
if (size > max) {
max = size;
}
final short rep = i.getFileReplication();
if (rep > maxReplication) {
maxReplication = rep;
}
last = i;
}
collectBlocksBeyondMaxAndClear(max, info);
// remove this from the circular linked list.
last.next = this.next;
// Set the replication of the current INode to the max of all the other
// linked INodes, so that in case the current INode is retrieved from the
// blocksMap before it is removed or updated, the correct replication
// number can be retrieved.
this.setFileReplication(maxReplication, null);
this.next = null;
// clear parent
setParent(null);
}
return 1;
}
private void collectBlocksBeyondMaxAndClear(final long max,
final BlocksMapUpdateInfo info) {
final BlockInfo[] oldBlocks = getBlocks();
if (oldBlocks != null) {
//find the minimum n such that the size of the first n blocks > max
int n = 0;
for(long size = 0; n < oldBlocks.length && max > size; n++) {
size += oldBlocks[n].getNumBytes();
}
// Replace the INode for all the remaining blocks in blocksMap
BlocksMapINodeUpdateEntry entry = new BlocksMapINodeUpdateEntry(this,
next);
if (info != null) {
for (int i = 0; i < n; i++) {
info.addUpdateBlock(oldBlocks[i], entry);
}
}
// starting from block n, the data is beyond max.
if (n < oldBlocks.length) {
// resize the array.
final BlockInfo[] newBlocks;
if (n == 0) {
newBlocks = null;
} else {
newBlocks = new BlockInfo[n];
System.arraycopy(oldBlocks, 0, newBlocks, 0, n);
}
for(INodeFileWithLink i = next; i != this; i = i.getNext()) {
i.setBlocks(newBlocks);
}
// collect the blocks beyond max.
if (info != null) {
for(; n < oldBlocks.length; n++) {
info.addDeleteBlock(oldBlocks[n]);
}
}
}
setBlocks(null);
}
}
}

92
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithSnapshot.java Normal file
View File

@ -0,0 +1,92 @@
/**
* 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.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithSnapshot.Util;
/**
* Represent an {@link INodeFile} that is snapshotted.
* Note that snapshot files are represented by {@link INodeFileSnapshot}.
*/
@InterfaceAudience.Private
public class INodeFileWithSnapshot extends INodeFile
implements FileWithSnapshot {
private FileWithSnapshot next;
public INodeFileWithSnapshot(INodeFile f) {
super(f);
setNext(this);
}
@Override
public INodeFileUnderConstructionWithSnapshot toUnderConstruction(
final String clientName,
final String clientMachine,
final DatanodeDescriptor clientNode) {
final INodeFileUnderConstructionWithSnapshot f
= new INodeFileUnderConstructionWithSnapshot(this,
clientName, clientMachine, clientNode);
Util.replace(this, f);
return f;
}
@Override
public Pair<INodeFileWithSnapshot, INodeFileSnapshot> createSnapshotCopy() {
return new Pair<INodeFileWithSnapshot, INodeFileSnapshot>(this,
new INodeFileSnapshot(this));
}
@Override
public INodeFile asINodeFile() {
return this;
}
@Override
public FileWithSnapshot getNext() {
return next;
}
@Override
public void setNext(FileWithSnapshot next) {
this.next = next;
}
@Override
public void insert(FileWithSnapshot inode) {
inode.setNext(this.getNext());
this.setNext(inode);
}
@Override
public short getBlockReplication() {
return Util.getBlockReplication(this);
}
@Override
public int collectSubtreeBlocksAndClear(BlocksMapUpdateInfo info) {
if (next == null || next == this) {
// this is the only remaining inode.
return super.collectSubtreeBlocksAndClear(info);
} else {
return Util.collectSubtreeBlocksAndClear(this, info);
}
}
}

3
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSnapshotPathINodes.java
View File

@ -364,8 +364,7 @@ public void testSnapshotPathINodesWithAddedFile() throws Exception {
* Test {@link INodeDirectory#getExistingPathINodes(byte[][], int, boolean)}
* for snapshot file while modifying file after snapshot.
*/
// TODO: disable it temporarily since it uses append.
// @Test
@Test
public void testSnapshotPathINodesAfterModification() throws Exception {
//file1 was deleted, create it again.
DFSTestUtil.createFile(hdfs, file1, 1024, REPLICATION, seed);

10
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshot.java
View File

@ -270,10 +270,9 @@ private Modification[] prepareModifications(TestDirectoryTree.Node[] nodes)
Modification delete = new FileDeletion(
node.fileList.get((node.nullFileIndex + 1) % node.fileList.size()),
hdfs);
// TODO: fix append for snapshots
// Modification append = new FileAppend(
// node.fileList.get((node.nullFileIndex + 2) % node.fileList.size()),
// hdfs, (int) BLOCKSIZE);
Modification append = new FileAppend(
node.fileList.get((node.nullFileIndex + 2) % node.fileList.size()),
hdfs, (int) BLOCKSIZE);
Modification chmod = new FileChangePermission(
node.fileList.get((node.nullFileIndex + 3) % node.fileList.size()),
hdfs, genRandomPermission());
@ -290,8 +289,7 @@ private Modification[] prepareModifications(TestDirectoryTree.Node[] nodes)
mList.add(create);
mList.add(delete);
// TODO: fix append for snapshots
// mList.add(append);
mList.add(append);
mList.add(chmod);
mList.add(chown);
mList.add(replication);

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

@ -39,7 +39,7 @@
/**
* This class tests the replication handling/calculation of snapshots. In
* particular, {@link INodeFile#getFileReplication()} and
* {@link INodeFileWithLink#getBlockReplication()} are tested to make sure
* {@link INodeFileWithSnapshot#getBlockReplication()} are tested to make sure
* the number of replication is calculated correctly with/without snapshots.
*/
public class TestSnapshotReplication {
@ -132,7 +132,7 @@ INodeFile getINodeFile(Path p) throws Exception {
* INodes
* @param expectedBlockRep
* The expected replication number that should be returned by
* {@link INodeFileWithLink#getBlockReplication()} of all the INodes
* {@link INodeFileWithSnapshot#getBlockReplication()} of all the INodes
* @throws Exception
*/
private void checkSnapshotFileReplication(Path currentFile,