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HDFS-6266. Identify full path for a given INode. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1589920 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2014-04-25 02:05:42 +00:00
parent 7bad941152
commit 10a037cccb
11 changed files with 427 additions and 17 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -322,6 +322,8 @@ Release 2.5.0 - UNRELEASED
HDFS-6282. Re-add testIncludeByRegistrationName. (cmccabe)
HDFS-6266. Identify full path for a given INode. (jing9)
OPTIMIZATIONS
HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

53
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -2910,7 +2910,9 @@ public class FSDirectory implements Closeable {
/**
* Given an INode get all the path complents leading to it from the root.
* If an Inode corresponding to C is given in /A/B/C, the returned
* patch components will be {root, A, B, C}
* patch components will be {root, A, B, C}.
* Note that this method cannot handle scenarios where the inode is in a
* snapshot.
*/
static byte[][] getPathComponents(INode inode) {
List<byte[]> components = new ArrayList<byte[]>();
@ -2921,7 +2923,54 @@ public class FSDirectory implements Closeable {
}
return components.toArray(new byte[components.size()][]);
}
/**
* The same functionality with {@link #getPathComponents(INode)}, but can
* handle snapshots.
*/
public static byte[][] getPathComponentsWithSnapshot(INode inode) {
List<byte[]> components = new ArrayList<byte[]>();
boolean inSnapshot = false;
int snapshotId = Snapshot.CURRENT_STATE_ID;
do {
if (inode instanceof INodeReference.WithCount) {
// identify the corresponding WithName or DstReference node
inode = ((WithCount) inode).getParentRef(snapshotId);
} else { // normal INode and WithName/DstReference
if (inode instanceof INodeDirectory
&& inode.asDirectory().isSnapshottable() && inSnapshot
&& snapshotId != Snapshot.CURRENT_STATE_ID) {
INodeDirectorySnapshottable sdir = (INodeDirectorySnapshottable) inode
.asDirectory();
Snapshot snapshot = sdir.getSnapshotById(snapshotId);
if (snapshot != null) {
components.add(0, snapshot.getRoot().getLocalNameBytes());
components.add(0, HdfsConstants.DOT_SNAPSHOT_DIR_BYTES);
// the snapshot has been found, thus no need to check snapshottable
// directory afterwards
inSnapshot = false;
}
}
INode parent = inode.getParentReference() != null ? inode
.getParentReference() : inode.getParent();
if (parent != null && parent instanceof INodeDirectory) {
int sid = parent.asDirectory().searchChild(inode);
Preconditions.checkState(sid != Snapshot.NO_SNAPSHOT_ID);
if (sid != Snapshot.CURRENT_STATE_ID
&& snapshotId == Snapshot.CURRENT_STATE_ID) {
snapshotId = sid;
inSnapshot = true;
}
components.add(0, inode.getLocalNameBytes());
} else if (parent == null) { // root
components.add(0, inode.getLocalNameBytes());
}
inode = parent;
}
} while (inode != null);
return components.toArray(new byte[components.size()][]);
}
/**
* @return path components for reserved path, else null.
*/

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

@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.server.namenode;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
@ -656,7 +655,8 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
* @return array of byte arrays each of which represents
* a single path component.
*/
static byte[][] getPathComponents(String path) {
@VisibleForTesting
public static byte[][] getPathComponents(String path) {
return getPathComponents(getPathNames(path));
}

23
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
View File

@ -356,6 +356,29 @@ public class INodeDirectory extends INodeWithAdditionalFields
return sf.getChild(this, name, snapshotId);
}
/**
* Search for the given INode in the children list and the deleted lists of
* snapshots.
* @return {@link Snapshot#CURRENT_STATE_ID} if the inode is in the children
* list; {@link Snapshot#NO_SNAPSHOT_ID} if the inode is neither in the
* children list nor in any snapshot; otherwise the snapshot id of the
* corresponding snapshot diff list.
*/
int searchChild(INode inode) {
INode child = getChild(inode.getLocalNameBytes(), Snapshot.CURRENT_STATE_ID);
if (child != inode) {
// inode is not in parent's children list, thus inode must be in
// snapshot. identify the snapshot id and later add it into the path
DirectoryDiffList diffs = getDiffs();
if (diffs == null) {
return Snapshot.NO_SNAPSHOT_ID;
}
return diffs.findSnapshotDeleted(inode);
} else {
return Snapshot.CURRENT_STATE_ID;
}
}
/**
* @param snapshotId

17
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeReference.java
View File

@ -418,6 +418,23 @@ public abstract class INodeReference extends INode {
return withNameList.get(-i - 2);
}
}
public INodeReference getParentRef(int snapshotId) {
// when the given snapshotId is CURRENT_STATE_ID, it is possible that we
// do not know where the corresponding inode belongs, thus we simply
// return the last reference node
if (snapshotId == Snapshot.CURRENT_STATE_ID) {
return this.getParentReference() != null ? this.getParentReference()
: this.getLastWithName();
}
// otherwise we search the withNameList
for (int i = 0; i < withNameList.size(); i++) {
if (snapshotId <= withNameList.get(i).lastSnapshotId) {
return withNameList.get(i);
}
}
return this.getParentReference();
}
}
/** A reference with a fixed name. */

19
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java
View File

@ -364,6 +364,25 @@ public class DirectoryWithSnapshotFeature implements INode.Feature {
}
return false;
}
/**
* Find the corresponding snapshot whose deleted list contains the given
* inode.
* @return the id of the snapshot. {@link Snapshot#NO_SNAPSHOT_ID} if the
* given inode is not in any of the snapshot.
*/
public int findSnapshotDeleted(final INode child) {
final List<DirectoryDiff> diffList = asList();
for(int i = diffList.size() - 1; i >= 0; i--) {
final ChildrenDiff diff = diffList.get(i).diff;
final int d = diff.searchIndex(ListType.DELETED,
child.getLocalNameBytes());
if (d >= 0 && diff.getList(ListType.DELETED).get(d) == child) {
return diffList.get(i).getSnapshotId();
}
}
return Snapshot.NO_SNAPSHOT_ID;
}
}
private static Map<INode, INode> cloneDiffList(List<INode> diffList) {

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

@ -206,7 +206,7 @@ public class INodeDirectorySnapshottable extends INodeDirectory {
return i < 0? null: snapshotsByNames.get(i);
}
Snapshot getSnapshotById(int sid) {
public Snapshot getSnapshotById(int sid) {
for (Snapshot s : snapshotsByNames) {
if (s.getId() == sid) {
return s;

16
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/DFSTestUtil.java
View File

@ -82,6 +82,7 @@ import java.util.concurrent.TimeoutException;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/** Utilities for HDFS tests */
public class DFSTestUtil {
@ -1192,7 +1193,20 @@ public class DFSTestUtil {
long c = (val + factor - 1) / factor;
return c * factor;
}
public static void checkComponentsEquals(byte[][] expected, byte[][] actual) {
assertEquals("expected: " + DFSUtil.byteArray2PathString(expected)
+ ", actual: " + DFSUtil.byteArray2PathString(actual), expected.length,
actual.length);
int i = 0;
for (byte[] e : expected) {
byte[] actualComponent = actual[i++];
assertTrue("expected: " + DFSUtil.bytes2String(e) + ", actual: "
+ DFSUtil.bytes2String(actualComponent),
Arrays.equals(e, actualComponent));
}
}
/**
* A short-circuit test context which makes it easier to get a short-circuit
* configuration and set everything up.

11
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestINodeFile.java
View File

@ -27,7 +27,6 @@ import static org.junit.Assert.fail;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.junit.Assert;
@ -789,14 +788,6 @@ public class TestINodeFile {
return dir; // Last Inode in the chain
}
private static void checkEquals(byte[][] expected, byte[][] actual) {
assertEquals(expected.length, actual.length);
int i = 0;
for (byte[] e : expected) {
assertTrue(Arrays.equals(e, actual[i++]));
}
}
/**
* Test for {@link FSDirectory#getPathComponents(INode)}
*/
@ -806,7 +797,7 @@ public class TestINodeFile {
INode inode = createTreeOfInodes(path);
byte[][] expected = INode.getPathComponents(path);
byte[][] actual = FSDirectory.getPathComponents(inode);
checkEquals(expected, actual);
DFSTestUtil.checkComponentsEquals(expected, actual);
}
/**

295
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestFullPathNameWithSnapshot.java Normal file
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@ -0,0 +1,295 @@
/**
* 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.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeReference;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
/**
* Test getting the full path name of a given inode. The INode may be in
* snapshot.
*/
public class TestFullPathNameWithSnapshot {
private static final int BLOCKSIZE = 1024;
private static final short REPLICATION = 1;
private Configuration conf;
private MiniDFSCluster cluster;
private FSDirectory fsdir;
private DistributedFileSystem dfs;
@Before
public void setUp() throws Exception {
conf = new Configuration();
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCKSIZE);
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION)
.build();
cluster.waitActive();
fsdir = cluster.getNamesystem().getFSDirectory();
dfs = cluster.getFileSystem();
}
@After
public void tearDown() throws Exception {
if (cluster != null) {
cluster.shutdown();
}
}
/**
* Normal case without snapshot involved
*/
@Test
public void testNormalINode() throws Exception {
final Path bar = new Path("/foo/bar");
dfs.mkdirs(bar);
final Path file = new Path(bar, "file");
DFSTestUtil.createFile(dfs, file, BLOCKSIZE, REPLICATION, 0L);
INode fileNode = fsdir.getINode4Write(file.toString());
byte[][] pathComponents = FSDirectory
.getPathComponentsWithSnapshot(fileNode);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(file.toString()),
pathComponents);
}
/**
* INode in deleted list
*/
@Test
public void testDeletedINode() throws Exception {
final Path foo = new Path("/foo");
final Path f1 = new Path(foo, "f1");
DFSTestUtil.createFile(dfs, f1, BLOCKSIZE, REPLICATION, 0L);
final Path bar = new Path(foo, "bar");
dfs.mkdirs(bar);
final Path f2 = new Path(bar, "f2");
DFSTestUtil.createFile(dfs, f2, BLOCKSIZE, REPLICATION, 0L);
INode f1Node = fsdir.getINode4Write(f1.toString());
INode f2Node = fsdir.getINode4Write(f2.toString());
SnapshotTestHelper.createSnapshot(dfs, foo, "s1");
dfs.delete(bar, true);
SnapshotTestHelper.createSnapshot(dfs, foo, "s2");
dfs.delete(f1, true);
byte[][] f1Components = FSDirectory.getPathComponentsWithSnapshot(f1Node);
byte[][] f2Components = FSDirectory.getPathComponentsWithSnapshot(f2Node);
// expected: /foo/.snapshot/s2/f1
String f1Snapshot = SnapshotTestHelper.getSnapshotPath(foo, "s2",
f1.getName()).toString();
// expected: /foo/.snapshot/s1/bar/f2
String f2Snapshot = SnapshotTestHelper.getSnapshotPath(foo, "s1", "bar/f2")
.toString();
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(f1Snapshot),
f1Components);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(f2Snapshot),
f2Components);
// delete snapshot s2
dfs.deleteSnapshot(foo, "s2");
// expected: /foo/.snapshot/s1/f1
f1Snapshot = SnapshotTestHelper.getSnapshotPath(foo, "s1", f1.getName())
.toString();
f1Components = FSDirectory.getPathComponentsWithSnapshot(f1Node);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(f1Snapshot),
f1Components);
}
/**
* INode after renaming
*/
@Test
public void testRenamedINode() throws Exception {
final Path foo = new Path("/foo");
final Path bar = new Path(foo, "bar");
final Path f1 = new Path(bar, "f1");
final Path f2 = new Path(bar, "f2");
DFSTestUtil.createFile(dfs, f1, BLOCKSIZE, REPLICATION, 0L);
DFSTestUtil.createFile(dfs, f2, BLOCKSIZE, REPLICATION, 0L);
// create snapshot s1
SnapshotTestHelper.createSnapshot(dfs, foo, "s1");
INode f2Node = fsdir.getINode4Write(f2.toString());
// delete /foo/bar/f2
dfs.delete(f2, true);
// rename bar to bar2
final Path bar2 = new Path(foo, "bar2");
dfs.rename(bar, bar2);
// create snapshot s2
SnapshotTestHelper.createSnapshot(dfs, foo, "s2");
// /foo/.snapshot/s1/bar
Path barPath = SnapshotTestHelper.getSnapshotPath(foo, "s1", bar.getName());
INode barNode = fsdir.getINode(barPath.toString());
Assert.assertTrue(barNode instanceof INodeReference.WithName);
INode bar2Node = fsdir.getINode(bar2.toString());
Assert.assertTrue(bar2Node instanceof INodeReference.DstReference);
byte[][] barComponents = FSDirectory.getPathComponentsWithSnapshot(barNode);
byte[][] bar2Components = FSDirectory
.getPathComponentsWithSnapshot(bar2Node);
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(barPath.toString()), barComponents);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(bar2.toString()),
bar2Components);
byte[][] f2Components = FSDirectory.getPathComponentsWithSnapshot(f2Node);
// expected: /foo/.snapshot/s1/bar/f2
Path deletedf2 = SnapshotTestHelper.getSnapshotPath(foo, "s1", "bar/f2");
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(deletedf2.toString()), f2Components);
final Path newf1 = new Path(bar2, f1.getName());
INode f1Node = fsdir.getINode(newf1.toString());
Assert.assertTrue(dfs.delete(newf1, true));
Path deletedf1 = SnapshotTestHelper.getSnapshotPath(foo, "s2", "bar2/f1");
byte[][] f1Components = FSDirectory.getPathComponentsWithSnapshot(f1Node);
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(deletedf1.toString()), f1Components);
}
/**
* Similar with testRenamedINode but the rename is across two snapshottable
* directory.
*/
@Test
public void testRenamedINode2() throws Exception {
final Path foo1 = new Path("/foo1");
final Path foo2 = new Path("/foo2");
final Path bar = new Path(foo1, "bar");
final Path f1 = new Path(bar, "f1");
final Path f2 = new Path(bar, "f2");
dfs.mkdirs(foo2);
DFSTestUtil.createFile(dfs, f1, BLOCKSIZE, REPLICATION, 0L);
DFSTestUtil.createFile(dfs, f2, BLOCKSIZE, REPLICATION, 0L);
// create snapshots on foo1 and foo2
SnapshotTestHelper.createSnapshot(dfs, foo1, "s1");
SnapshotTestHelper.createSnapshot(dfs, foo2, "s2");
INode f2Node = fsdir.getINode4Write(f2.toString());
// delete /foo1/bar/f2
dfs.delete(f2, true);
// rename bar to bar2
final Path bar2 = new Path(foo2, "bar2");
dfs.rename(bar, bar2);
// create snapshot s3 and s4 on foo1 and foo2
SnapshotTestHelper.createSnapshot(dfs, foo1, "s3");
SnapshotTestHelper.createSnapshot(dfs, foo2, "s4");
// /foo1/.snapshot/s1/bar
Path barPath = SnapshotTestHelper
.getSnapshotPath(foo1, "s1", bar.getName());
INode barNode = fsdir.getINode(barPath.toString());
Assert.assertTrue(barNode instanceof INodeReference.WithName);
INode bar2Node = fsdir.getINode(bar2.toString());
Assert.assertTrue(bar2Node instanceof INodeReference.DstReference);
byte[][] barComponents = FSDirectory.getPathComponentsWithSnapshot(barNode);
byte[][] bar2Components = FSDirectory
.getPathComponentsWithSnapshot(bar2Node);
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(barPath.toString()), barComponents);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(bar2.toString()),
bar2Components);
byte[][] f2Components = FSDirectory.getPathComponentsWithSnapshot(f2Node);
// expected: /foo1/.snapshot/s1/bar/f2
Path deletedf2 = SnapshotTestHelper.getSnapshotPath(foo1, "s1", "bar/f2");
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(deletedf2.toString()), f2Components);
final Path newf1 = new Path(bar2, f1.getName());
INode f1Node = fsdir.getINode(newf1.toString());
Assert.assertTrue(dfs.delete(newf1, true));
// /foo2/.snapshot/s4/bar2/f1
Path deletedf1 = SnapshotTestHelper.getSnapshotPath(foo2, "s4", "bar2/f1");
byte[][] f1Components = FSDirectory.getPathComponentsWithSnapshot(f1Node);
DFSTestUtil.checkComponentsEquals(
INode.getPathComponents(deletedf1.toString()), f1Components);
}
/**
* Rename a directory to its prior descendant
*/
@Test
public void testNestedRename() throws Exception {
final Path sdir1 = new Path("/dir1");
final Path sdir2 = new Path("/dir2");
final Path foo = new Path(sdir1, "foo");
final Path bar = new Path(foo, "bar");
dfs.mkdirs(bar);
dfs.mkdirs(sdir2);
SnapshotTestHelper.createSnapshot(dfs, sdir1, "s1");
// /dir1/foo/bar -> /dir2/bar
final Path bar2 = new Path(sdir2, "bar");
dfs.rename(bar, bar2);
// /dir1/foo -> /dir2/bar/foo
final Path foo2 = new Path(bar2, "foo");
dfs.rename(foo, foo2);
// /dir2/bar
INode bar2Node = fsdir.getINode(bar2.toString());
Assert.assertTrue(bar2Node instanceof INodeReference.DstReference);
byte[][] bar2Components = FSDirectory
.getPathComponentsWithSnapshot(bar2Node);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(bar2.toString()),
bar2Components);
// /dir1/.snapshot/s1/foo/bar
String oldbar = SnapshotTestHelper.getSnapshotPath(sdir1, "s1", "foo/bar")
.toString();
INode oldbarNode = fsdir.getINode(oldbar);
Assert.assertTrue(oldbarNode instanceof INodeReference.WithName);
byte[][] oldbarComponents = FSDirectory
.getPathComponentsWithSnapshot(oldbarNode);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(oldbar),
oldbarComponents);
// /dir2/bar/foo
INode foo2Node = fsdir.getINode(foo2.toString());
Assert.assertTrue(foo2Node instanceof INodeReference.DstReference);
byte[][] foo2Components = FSDirectory
.getPathComponentsWithSnapshot(foo2Node);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(foo2.toString()),
foo2Components);
// /dir1/.snapshot/s1/foo
String oldfoo = SnapshotTestHelper.getSnapshotPath(sdir1, "s1",
foo.getName()).toString();
INode oldfooNode = fsdir.getINode(oldfoo);
Assert.assertTrue(oldfooNode instanceof INodeReference.WithName);
byte[][] oldfooComponents = FSDirectory
.getPathComponentsWithSnapshot(oldfooNode);
DFSTestUtil.checkComponentsEquals(INode.getPathComponents(oldfoo),
oldfooComponents);
}
}

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

@ -1829,7 +1829,7 @@ public class TestRenameWithSnapshots {
}
/**
* move a directory to its prior descedant
* move a directory to its prior descendant
*/
@Test
public void testRename2PreDescendant_2() throws Exception {