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HADOOP-17024. ListStatus on ViewFS root (ls "/") should list the linkFallBack root (configured target root). Contributed by Abhishek Das. 

(cherry picked from commit ce4ec74453)
This commit is contained in:
Abhishek Das 2020-05-18 22:27:12 -07:00 committed by Uma Maheswara Rao G
parent 544996c857
commit 5b248de42d
4 changed files with 209 additions and 2 deletions
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13
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/InodeTree.java
View File

@ -123,6 +123,7 @@ abstract class InodeTree<T> {
private final Map<String, INode<T>> children = new HashMap<>();
private T internalDirFs = null; //filesystem of this internal directory
private boolean isRoot = false;
private INodeLink<T> fallbackLink = null;
INodeDir(final String pathToNode, final UserGroupInformation aUgi) {
super(pathToNode, aUgi);
@ -149,6 +150,17 @@ abstract class InodeTree<T> {
return isRoot;
}
INodeLink<T> getFallbackLink() {
return fallbackLink;
}
void addFallbackLink(INodeLink<T> link) throws IOException {
if (!isRoot) {
throw new IOException("Fallback link can only be added for root");
}
this.fallbackLink = link;
}
Map<String, INode<T>> getChildren() {
return Collections.unmodifiableMap(children);
}
@ -580,6 +592,7 @@ abstract class InodeTree<T> {
}
}
rootFallbackLink = fallbackLink;
getRootDir().addFallbackLink(rootFallbackLink);
}
if (!gotMountTableEntry) {

49
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
View File

@ -1200,10 +1200,19 @@ public class ViewFileSystem extends FileSystem {
}
/**
* {@inheritDoc}
*
* Note: listStatus on root("/") considers listing from fallbackLink if
* available. If the same directory name is present in configured mount
* path as well as in fallback link, then only the configured mount path
* will be listed in the returned result.
*/
@Override
public FileStatus[] listStatus(Path f) throws AccessControlException,
FileNotFoundException, IOException {
checkPathIsSlash(f);
FileStatus[] fallbackStatuses = listStatusForFallbackLink();
FileStatus[] result = new FileStatus[theInternalDir.getChildren().size()];
int i = 0;
for (Entry<String, INode<FileSystem>> iEntry :
@ -1226,7 +1235,45 @@ public class ViewFileSystem extends FileSystem {
myUri, null));
}
}
return result;
if (fallbackStatuses.length > 0) {
return consolidateFileStatuses(fallbackStatuses, result);
} else {
return result;
}
}
private FileStatus[] consolidateFileStatuses(FileStatus[] fallbackStatuses,
FileStatus[] mountPointStatuses) {
ArrayList<FileStatus> result = new ArrayList<>();
Set<String> pathSet = new HashSet<>();
for (FileStatus status : mountPointStatuses) {
result.add(status);
pathSet.add(status.getPath().getName());
}
for (FileStatus status : fallbackStatuses) {
if (!pathSet.contains(status.getPath().getName())) {
result.add(status);
}
}
return result.toArray(new FileStatus[0]);
}
private FileStatus[] listStatusForFallbackLink() throws IOException {
if (theInternalDir.isRoot() &&
theInternalDir.getFallbackLink() != null) {
FileSystem linkedFs =
theInternalDir.getFallbackLink().getTargetFileSystem();
// Fallback link is only applicable for root
FileStatus[] statuses = linkedFs.listStatus(new Path("/"));
for (FileStatus status : statuses) {
// Fix the path back to viewfs scheme
status.setPath(
new Path(myUri.toString(), status.getPath().getName()));
}
return statuses;
} else {
return new FileStatus[0];
}
}
@Override

51
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFs.java
View File

@ -25,10 +25,12 @@ import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
@ -950,10 +952,19 @@ public class ViewFs extends AbstractFileSystem {
return -1;
}
/**
* {@inheritDoc}
*
* Note: listStatus on root("/") considers listing from fallbackLink if
* available. If the same directory name is present in configured mount
* path as well as in fallback link, then only the configured mount path
* will be listed in the returned result.
*/
@Override
public FileStatus[] listStatus(final Path f) throws AccessControlException,
IOException {
checkPathIsSlash(f);
FileStatus[] fallbackStatuses = listStatusForFallbackLink();
FileStatus[] result = new FileStatus[theInternalDir.getChildren().size()];
int i = 0;
for (Entry<String, INode<AbstractFileSystem>> iEntry :
@ -979,7 +990,45 @@ public class ViewFs extends AbstractFileSystem {
myUri, null));
}
}
return result;
if (fallbackStatuses.length > 0) {
return consolidateFileStatuses(fallbackStatuses, result);
} else {
return result;
}
}
private FileStatus[] consolidateFileStatuses(FileStatus[] fallbackStatuses,
FileStatus[] mountPointStatuses) {
ArrayList<FileStatus> result = new ArrayList<>();
Set<String> pathSet = new HashSet<>();
for (FileStatus status : mountPointStatuses) {
result.add(status);
pathSet.add(status.getPath().getName());
}
for (FileStatus status : fallbackStatuses) {
if (!pathSet.contains(status.getPath().getName())) {
result.add(status);
}
}
return result.toArray(new FileStatus[0]);
}
private FileStatus[] listStatusForFallbackLink() throws IOException {
if (theInternalDir.isRoot() &&
theInternalDir.getFallbackLink() != null) {
AbstractFileSystem linkedFs =
theInternalDir.getFallbackLink().getTargetFileSystem();
// Fallback link is only applicable for root
FileStatus[] statuses = linkedFs.listStatus(new Path("/"));
for (FileStatus status : statuses) {
// Fix the path back to viewfs scheme
status.setPath(
new Path(myUri.toString(), status.getPath().getName()));
}
return statuses;
} else {
return new FileStatus[0];
}
}
@Override

98
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemLinkFallback.java
View File

@ -26,6 +26,7 @@ import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashSet;
import javax.security.auth.login.LoginException;
import org.apache.hadoop.conf.Configuration;
@ -261,4 +262,101 @@ public class TestViewFileSystemLinkFallback extends ViewFileSystemBaseTest {
e.getMessage().contains(expectedErrorMsg));
}
}
/**
* This tests whether the fallback link gets listed for list operation
* of root directory of mount table.
* @throws Exception
*/
@Test
public void testListingWithFallbackLink() throws Exception {
Path dir1 = new Path(targetTestRoot, "fallbackDir/dir1");
fsTarget.mkdirs(dir1);
String clusterName = Constants.CONFIG_VIEWFS_DEFAULT_MOUNT_TABLE;
URI viewFsUri = new URI(FsConstants.VIEWFS_SCHEME, clusterName,
"/", null, null);
HashSet<Path> beforeFallback = new HashSet<>();
try(FileSystem vfs = FileSystem.get(viewFsUri, conf)) {
for (FileStatus stat : vfs.listStatus(new Path(viewFsUri.toString()))) {
beforeFallback.add(stat.getPath());
}
}
ConfigUtil.addLinkFallback(conf, clusterName,
new Path(targetTestRoot, "fallbackDir").toUri());
try (FileSystem vfs = FileSystem.get(viewFsUri, conf)) {
HashSet<Path> afterFallback = new HashSet<>();
for (FileStatus stat : vfs.listStatus(new Path(viewFsUri.toString()))) {
afterFallback.add(stat.getPath());
}
afterFallback.removeAll(beforeFallback);
assertTrue("Listing didn't include fallback link",
afterFallback.size() == 1);
Path[] fallbackArray = new Path[afterFallback.size()];
afterFallback.toArray(fallbackArray);
Path expected = new Path(viewFsUri.toString(), "dir1");
assertEquals("Path did not match",
expected, fallbackArray[0]);
// Create a directory using the returned fallback path and verify
Path childDir = new Path(fallbackArray[0], "child");
vfs.mkdirs(childDir);
FileStatus status = fsTarget.getFileStatus(new Path(dir1, "child"));
assertTrue(status.isDirectory());
assertTrue(vfs.getFileStatus(childDir).isDirectory());
}
}
/**
* This tests whether fallback directory gets shaded during list operation
* of root directory of mount table when the same directory name exists as
* mount point as well as in the fallback linked directory.
* @throws Exception
*/
@Test
public void testListingWithFallbackLinkWithSameMountDirectories()
throws Exception {
// Creating two directories under the fallback directory.
// "user" directory already exists as configured mount point.
Path dir1 = new Path(targetTestRoot, "fallbackDir/user");
Path dir2 = new Path(targetTestRoot, "fallbackDir/user1");
fsTarget.mkdirs(dir1);
fsTarget.mkdirs(dir2);
String clusterName = Constants.CONFIG_VIEWFS_DEFAULT_MOUNT_TABLE;
URI viewFsUri = new URI(FsConstants.VIEWFS_SCHEME, clusterName,
"/", null, null);
HashSet<Path> beforeFallback = new HashSet<>();
try(FileSystem vfs = FileSystem.get(viewFsUri, conf)) {
for (FileStatus stat : vfs.listStatus(new Path(viewFsUri.toString()))) {
beforeFallback.add(stat.getPath());
}
}
ConfigUtil.addLinkFallback(conf, clusterName,
new Path(targetTestRoot, "fallbackDir").toUri());
try (FileSystem vfs = FileSystem.get(viewFsUri, conf)) {
HashSet<Path> afterFallback = new HashSet<>();
for (FileStatus stat : vfs.listStatus(new Path(viewFsUri.toString()))) {
afterFallback.add(stat.getPath());
}
afterFallback.removeAll(beforeFallback);
assertTrue("The same directory name in fallback link should be shaded",
afterFallback.size() == 1);
Path[] fallbackArray = new Path[afterFallback.size()];
// Only user1 should be listed as fallback link
Path expected = new Path(viewFsUri.toString(), "user1");
assertEquals("Path did not match",
expected, afterFallback.toArray(fallbackArray)[0]);
// Create a directory using the returned fallback path and verify
Path childDir = new Path(fallbackArray[0], "child");
vfs.mkdirs(childDir);
FileStatus status = fsTarget.getFileStatus(new Path(dir2, "child"));
assertTrue(status.isDirectory());
assertTrue(vfs.getFileStatus(childDir).isDirectory());
}
}
}