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HDFS-4500. Refactor snapshot INode methods.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1446355 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-02-14 22:00:36 +00:00
parent 02e6b72ae1
commit d42d0860cb
9 changed files with 104 additions and 154 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-2802.txt
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@ -155,3 +155,5 @@ Branch-2802 Snapshot (Unreleased)
HDFS-4480. Eliminate the file snapshot circular linked list. (szetszwo)
HDFS-4481. Change fsimage to support snapshot file diffs. (szetszwo)
HDFS-4500. Refactor snapshot INode methods. (szetszwo)

65
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java
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@ -48,17 +48,6 @@
public abstract class INode implements Diff.Element<byte[]> {
public static final Log LOG = LogFactory.getLog(INode.class);
/** A pair of objects. */
public static class Pair<L, R> {
public final L left;
public final R right;
public Pair(L left, R right) {
this.left = left;
this.right = right;
}
}
/** Wrapper of two counters for namespace consumed and diskspace consumed. */
static class DirCounts {
/** namespace count */
@ -177,12 +166,12 @@ void clonePermissionStatus(INode that) {
this.permission = that.permission;
}
/** Get the {@link PermissionStatus} */
public PermissionStatus getPermissionStatus(Snapshot snapshot) {
public final PermissionStatus getPermissionStatus(Snapshot snapshot) {
return new PermissionStatus(getUserName(snapshot), getGroupName(snapshot),
getFsPermission(snapshot));
}
/** The same as getPermissionStatus(null). */
public PermissionStatus getPermissionStatus() {
public final PermissionStatus getPermissionStatus() {
return getPermissionStatus(null);
}
private INode updatePermissionStatus(PermissionStatusFormat f, long n,
@ -197,12 +186,16 @@ private INode updatePermissionStatus(PermissionStatusFormat f, long n,
* otherwise, get the result from the current inode.
* @return user name
*/
public String getUserName(Snapshot snapshot) {
public final String getUserName(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).getUserName();
}
int n = (int)PermissionStatusFormat.USER.retrieve(permission);
return SerialNumberManager.INSTANCE.getUser(n);
}
/** The same as getUserName(null). */
public String getUserName() {
public final String getUserName() {
return getUserName(null);
}
/** Set user */
@ -216,12 +209,16 @@ protected INode setUser(String user, Snapshot latest) {
* otherwise, get the result from the current inode.
* @return group name
*/
public String getGroupName(Snapshot snapshot) {
public final String getGroupName(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).getGroupName();
}
int n = (int)PermissionStatusFormat.GROUP.retrieve(permission);
return SerialNumberManager.INSTANCE.getGroup(n);
}
/** The same as getGroupName(null). */
public String getGroupName() {
public final String getGroupName() {
return getGroupName(null);
}
/** Set group */
@ -235,12 +232,16 @@ protected INode setGroup(String group, Snapshot latest) {
* otherwise, get the result from the current inode.
* @return permission.
*/
public FsPermission getFsPermission(Snapshot snapshot) {
public final FsPermission getFsPermission(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).getFsPermission();
}
return new FsPermission(
(short)PermissionStatusFormat.MODE.retrieve(permission));
}
/** The same as getFsPermission(null). */
public FsPermission getFsPermission() {
public final FsPermission getFsPermission() {
return getFsPermission(null);
}
protected short getFsPermissionShort() {
@ -252,6 +253,14 @@ INode setPermission(FsPermission permission, Snapshot latest) {
return updatePermissionStatus(PermissionStatusFormat.MODE, mode, latest);
}
/**
* @return if the given snapshot is null, return this;
* otherwise return the corresponding snapshot inode.
*/
public INode getSnapshotINode(final Snapshot snapshot) {
return this;
}
/** Is this inode in the latest snapshot? */
public final boolean isInLatestSnapshot(final Snapshot latest) {
return latest != null
@ -427,7 +436,11 @@ public void clearReferences() {
* otherwise, get the result from the current inode.
* @return modification time.
*/
public long getModificationTime(Snapshot snapshot) {
public final long getModificationTime(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).modificationTime;
}
return this.modificationTime;
}
@ -464,12 +477,16 @@ public final INode setModificationTime(long modtime, Snapshot latest) {
* otherwise, get the result from the current inode.
* @return access time
*/
public long getAccessTime(Snapshot snapshot) {
public final long getAccessTime(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).accessTime;
}
return accessTime;
}
/** The same as getAccessTime(null). */
public long getAccessTime() {
public final long getAccessTime() {
return getAccessTime(null);
}
@ -598,9 +615,7 @@ public void dumpTreeRecursively(PrintWriter out, StringBuilder prefix,
out.print(getObjectString());
out.print("), parent=");
out.print(parent == null? null: parent.getLocalName() + "/");
out.print(", permission=" + getFsPermission(snapshot));
out.print(", group=" + getGroupName(snapshot));
out.print(", user=" + getUserName(snapshot));
out.print(", " + getPermissionStatus(snapshot));
}
/**

34
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
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@ -834,21 +834,20 @@ public void dumpTreeRecursively(PrintWriter out, StringBuilder prefix,
prefix.setLength(prefix.length() - 2);
prefix.append(" ");
}
dumpTreeRecursively(out, prefix,
new Iterable<Pair<? extends INode, Snapshot>>() {
dumpTreeRecursively(out, prefix, new Iterable<SnapshotAndINode>() {
final Iterator<INode> i = getChildrenList(snapshot).iterator();
@Override
public Iterator<Pair<? extends INode, Snapshot>> iterator() {
return new Iterator<Pair<? extends INode, Snapshot>>() {
public Iterator<SnapshotAndINode> iterator() {
return new Iterator<SnapshotAndINode>() {
@Override
public boolean hasNext() {
return i.hasNext();
}
@Override
public Pair<INode, Snapshot> next() {
return new Pair<INode, Snapshot>(i.next(), snapshot);
public SnapshotAndINode next() {
return new SnapshotAndINode(snapshot, i.next());
}
@Override
@ -867,14 +866,29 @@ public void remove() {
*/
@VisibleForTesting
protected static void dumpTreeRecursively(PrintWriter out,
StringBuilder prefix, Iterable<Pair<? extends INode, Snapshot>> subs) {
StringBuilder prefix, Iterable<SnapshotAndINode> subs) {
if (subs != null) {
for(final Iterator<Pair<? extends INode, Snapshot>> i = subs.iterator(); i.hasNext();) {
final Pair<? extends INode, Snapshot> pair = i.next();
for(final Iterator<SnapshotAndINode> i = subs.iterator(); i.hasNext();) {
final SnapshotAndINode pair = i.next();
prefix.append(i.hasNext()? DUMPTREE_EXCEPT_LAST_ITEM: DUMPTREE_LAST_ITEM);
pair.left.dumpTreeRecursively(out, prefix, pair.right);
pair.inode.dumpTreeRecursively(out, prefix, pair.snapshot);
prefix.setLength(prefix.length() - 2);
}
}
}
/** A pair of Snapshot and INode objects. */
protected static class SnapshotAndINode {
public final Snapshot snapshot;
public final INode inode;
public SnapshotAndINode(Snapshot snapshot, INode inode) {
this.snapshot = snapshot;
this.inode = inode;
}
public SnapshotAndINode(Snapshot snapshot) {
this(snapshot, snapshot.getRoot());
}
}
}

11
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
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@ -122,6 +122,11 @@ public INodeFileUnderConstruction toUnderConstruction(
clientName, clientMachine, clientNode);
}
@Override
public INodeFile getSnapshotINode(final Snapshot snapshot) {
return this;
}
@Override
public INodeFile recordModification(final Snapshot latest) {
return isInLatestSnapshot(latest)?
@ -141,7 +146,11 @@ final INode setPermission(FsPermission permission, Snapshot latest) {
}
/** @return the replication factor of the file. */
public short getFileReplication(Snapshot snapshot) {
public final short getFileReplication(Snapshot snapshot) {
if (snapshot != null) {
return getSnapshotINode(snapshot).getFileReplication();
}
return HeaderFormat.getReplication(header);
}

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/AbstractINodeDiffList.java
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@ -145,9 +145,15 @@ final D getDiff(Snapshot snapshot) {
}
}
N getSnapshotINode(Snapshot snapshot) {
/**
* @return the inode corresponding to the given snapshot.
* Note that the current inode is returned if there is no change
* between the given snapshot and the current state.
*/
N getSnapshotINode(final Snapshot snapshot, final N currentINode) {
final D diff = getDiff(snapshot);
return diff == null? null: diff.getSnapshotINode();
final N inode = diff == null? null: diff.getSnapshotINode();
return inode == null? currentINode: inode;
}
/**

11
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectorySnapshottable.java
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@ -404,10 +404,10 @@ public void dumpTreeRecursively(PrintWriter out, StringBuilder prefix,
final String name = getLocalName();
out.println(name.isEmpty()? "/": name);
dumpTreeRecursively(out, prefix, new Iterable<Pair<? extends INode, Snapshot>>() {
dumpTreeRecursively(out, prefix, new Iterable<SnapshotAndINode>() {
@Override
public Iterator<Pair<? extends INode, Snapshot>> iterator() {
return new Iterator<Pair<? extends INode, Snapshot>>() {
public Iterator<SnapshotAndINode> iterator() {
return new Iterator<SnapshotAndINode>() {
final Iterator<DirectoryDiff> i = getDiffs().iterator();
private DirectoryDiff next = findNext();
@ -427,10 +427,9 @@ public boolean hasNext() {
}
@Override
public Pair<INodeDirectory, Snapshot> next() {
public SnapshotAndINode next() {
final Snapshot s = next.snapshot;
final Pair<INodeDirectory, Snapshot> pair =
new Pair<INodeDirectory, Snapshot>(s.getRoot(), s);
final SnapshotAndINode pair = new SnapshotAndINode(s);
next = findNext();
return pair;
}

37
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeDirectoryWithSnapshot.java
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@ -26,7 +26,6 @@
import java.util.Map;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffReportEntry;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport.DiffType;
import org.apache.hadoop.hdfs.server.namenode.FSImageSerialization;
@ -412,6 +411,11 @@ DirectoryDiffList getDiffs() {
return diffs;
}
@Override
public INodeDirectory getSnapshotINode(Snapshot snapshot) {
return diffs.getSnapshotINode(snapshot, this);
}
@Override
public INodeDirectoryWithSnapshot recordModification(final Snapshot latest) {
return isInLatestSnapshot(latest)?
@ -507,37 +511,6 @@ public INode getChild(byte[] name, Snapshot snapshot) {
return diff != null? diff.getChild(name, true, this): super.getChild(name, null);
}
@Override
public String getUserName(Snapshot snapshot) {
final INodeDirectory inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getUserName(): super.getUserName(null);
}
@Override
public String getGroupName(Snapshot snapshot) {
final INodeDirectory inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getGroupName(): super.getGroupName(null);
}
@Override
public FsPermission getFsPermission(Snapshot snapshot) {
final INodeDirectory inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getFsPermission(): super.getFsPermission(null);
}
@Override
public long getAccessTime(Snapshot snapshot) {
final INodeDirectory inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getAccessTime(): super.getAccessTime(null);
}
@Override
public long getModificationTime(Snapshot snapshot) {
final INodeDirectory inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getModificationTime()
: super.getModificationTime(null);
}
@Override
public String toDetailString() {
return super.toDetailString() + ", " + diffs;

44
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionWithSnapshot.java
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@ -18,7 +18,6 @@
package org.apache.hadoop.hdfs.server.namenode.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeFileUnderConstruction;
@ -86,6 +85,11 @@ public boolean isCurrentFileDeleted() {
return isCurrentFileDeleted;
}
@Override
public INodeFile getSnapshotINode(Snapshot snapshot) {
return diffs.getSnapshotINode(snapshot, this);
}
@Override
public INodeFileUnderConstructionWithSnapshot recordModification(
final Snapshot latest) {
@ -105,13 +109,6 @@ public FileDiffList getDiffs() {
return diffs;
}
@Override
public short getFileReplication(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getFileReplication()
: super.getFileReplication(null);
}
@Override
public short getBlockReplication() {
return Util.getBlockReplication(this);
@ -141,37 +138,6 @@ public int destroySubtreeAndCollectBlocks(final Snapshot snapshot,
return 1;
}
@Override
public String getUserName(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getUserName(): super.getUserName(null);
}
@Override
public String getGroupName(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getGroupName(): super.getGroupName(null);
}
@Override
public FsPermission getFsPermission(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getFsPermission(): super.getFsPermission(null);
}
@Override
public long getAccessTime(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getAccessTime(): super.getAccessTime(null);
}
@Override
public long getModificationTime(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getModificationTime()
: super.getModificationTime(null);
}
@Override
public String toDetailString() {
return super.toDetailString()

44
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithSnapshot.java
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@ -18,7 +18,6 @@
package org.apache.hadoop.hdfs.server.namenode.snapshot;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
@ -57,6 +56,11 @@ public boolean isCurrentFileDeleted() {
return isCurrentFileDeleted;
}
@Override
public INodeFile getSnapshotINode(Snapshot snapshot) {
return diffs.getSnapshotINode(snapshot, this);
}
@Override
public INodeFileWithSnapshot recordModification(final Snapshot latest) {
if (isInLatestSnapshot(latest)) {
@ -75,13 +79,6 @@ public FileDiffList getDiffs() {
return diffs;
}
@Override
public short getFileReplication(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getFileReplication()
: super.getFileReplication(null);
}
@Override
public short getBlockReplication() {
return Util.getBlockReplication(this);
@ -111,37 +108,6 @@ public int destroySubtreeAndCollectBlocks(final Snapshot snapshot,
return 1;
}
@Override
public String getUserName(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getUserName(): super.getUserName(null);
}
@Override
public String getGroupName(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getGroupName(): super.getGroupName(null);
}
@Override
public FsPermission getFsPermission(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getFsPermission(): super.getFsPermission(null);
}
@Override
public long getAccessTime(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getAccessTime(): super.getAccessTime(null);
}
@Override
public long getModificationTime(Snapshot snapshot) {
final INodeFile inode = diffs.getSnapshotINode(snapshot);
return inode != null? inode.getModificationTime()
: super.getModificationTime(null);
}
@Override
public String toDetailString() {
return super.toDetailString()