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HADOOP-17028. ViewFS should initialize mounted target filesystems lazily. Contributed by Abhishek Das (#2260, #3218)

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(cherry picked from commit 1dd03cc4b573270dc960117c3b6c74bb78215caa)
This commit is contained in:
Abhishek Das 2021-07-13 12:47:43 -07:00 committed by Konstantin V Shvachko
parent 39c8297350
commit 99b952fcb4
7 changed files with 338 additions and 45 deletions
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51
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/InodeTree.java
View File

@ -17,6 +17,7 @@
*/
package org.apache.hadoop.fs.viewfs;
import com.google.common.base.Function;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
@ -158,8 +159,10 @@ void addLink(final String pathComponent, final INodeLink<T> link)
static class INodeLink<T> extends INode<T> {
final boolean isMergeLink; // true if MergeLink
final URI[] targetDirLinkList;
final T targetFileSystem; // file system object created from the link.
private T targetFileSystem; // file system object created from the link.
// Function to initialize file system. Only applicable for simple links
private Function<URI, T> fileSystemInitMethod;
private final Object lock = new Object();
/**
* Construct a mergeLink
*/
@ -175,12 +178,14 @@ static class INodeLink<T> extends INode<T> {
* Construct a simple link (i.e. not a mergeLink)
*/
INodeLink(final String pathToNode, final UserGroupInformation aUgi,
final T targetFs, final URI aTargetDirLink) {
Function<URI, T> createFileSystemMethod,
final URI aTargetDirLink) {
super(pathToNode, aUgi);
targetFileSystem = targetFs;
targetFileSystem = null;
targetDirLinkList = new URI[1];
targetDirLinkList[0] = aTargetDirLink;
isMergeLink = false;
this.fileSystemInitMethod = createFileSystemMethod;
}
/**
@ -196,6 +201,33 @@ Path getTargetLink() {
}
return new Path(result.toString());
}
/**
* Get the instance of FileSystem to use, creating one if needed.
* @return An Initialized instance of T
* @throws IOException
*/
public T getTargetFileSystem() throws IOException {
if (targetFileSystem != null) {
return targetFileSystem;
}
// For non NFLY and MERGE links, we initialize the FileSystem when the
// corresponding mount path is accessed.
if (targetDirLinkList.length == 1) {
synchronized (lock) {
if (targetFileSystem != null) {
return targetFileSystem;
}
targetFileSystem = fileSystemInitMethod.apply(targetDirLinkList[0]);
if (targetFileSystem == null) {
throw new IOException(
"Could not initialize target File System for URI : " +
targetDirLinkList[0]);
}
}
}
return targetFileSystem;
}
}
@ -258,7 +290,7 @@ private void createLink(final String src, final String target,
getTargetFileSystem(targetsListURI), targetsListURI);
} else {
newLink = new INodeLink<T>(fullPath, aUgi,
getTargetFileSystem(new URI(target)), new URI(target));
initAndGetTargetFs(), new URI(target));
}
curInode.addLink(iPath, newLink);
mountPoints.add(new MountPoint<T>(src, newLink));
@ -267,14 +299,13 @@ private void createLink(final String src, final String target,
/**
* Below the "public" methods of InodeTree
*/
/**
* The user of this class must subclass and implement the following
* 3 abstract methods.
* @throws IOException
*/
protected abstract T getTargetFileSystem(final URI uri)
throws UnsupportedFileSystemException, URISyntaxException, IOException;
protected abstract Function<URI, T> initAndGetTargetFs();
protected abstract T getTargetFileSystem(final INodeDir<T> dir)
throws URISyntaxException;
@ -385,7 +416,7 @@ boolean isInternalDir() {
* @throws FileNotFoundException
*/
ResolveResult<T> resolve(final String p, final boolean resolveLastComponent)
throws FileNotFoundException {
throws IOException {
// TO DO: - more efficient to not split the path, but simply compare
String[] path = breakIntoPathComponents(p);
if (path.length <= 1) { // special case for when path is "/"
@ -422,7 +453,7 @@ ResolveResult<T> resolve(final String p, final boolean resolveLastComponent)
}
final ResolveResult<T> res =
new ResolveResult<T>(ResultKind.isExternalDir,
link.targetFileSystem, nextInode.fullPath, remainingPath);
link.getTargetFileSystem(), nextInode.fullPath, remainingPath);
return res;
} else if (nextInode instanceof INodeDir) {
curInode = (INodeDir<T>) nextInode;

85
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
View File

@ -21,10 +21,12 @@
import static org.apache.hadoop.fs.viewfs.Constants.CONFIG_VIEWFS_ENABLE_INNER_CACHE;
import static org.apache.hadoop.fs.viewfs.Constants.CONFIG_VIEWFS_ENABLE_INNER_CACHE_DEFAULT;
import com.google.common.base.Function;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.PrivilegedExceptionAction;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
@ -237,7 +239,7 @@ public void initialize(final URI theUri, final Configuration conf)
config = conf;
enableInnerCache = config.getBoolean(CONFIG_VIEWFS_ENABLE_INNER_CACHE,
CONFIG_VIEWFS_ENABLE_INNER_CACHE_DEFAULT);
final InnerCache innerCache = new InnerCache();
cache = new InnerCache();
// Now build client side view (i.e. client side mount table) from config.
final String authority = theUri.getAuthority();
try {
@ -245,16 +247,32 @@ public void initialize(final URI theUri, final Configuration conf)
fsState = new InodeTree<FileSystem>(conf, authority) {
@Override
protected
FileSystem getTargetFileSystem(final URI uri)
throws URISyntaxException, IOException {
FileSystem fs;
if (enableInnerCache) {
fs = innerCache.get(uri, config);
} else {
fs = FileSystem.get(uri, config);
protected Function<URI, FileSystem> initAndGetTargetFs() {
return new Function<URI, FileSystem>() {
@Override
public FileSystem apply(final URI uri) {
FileSystem fs;
try {
fs = ugi.doAs(new PrivilegedExceptionAction<FileSystem>() {
@Override
public FileSystem run() throws IOException {
if (enableInnerCache) {
synchronized (cache) {
return cache.get(uri, config);
}
} else {
return FileSystem.get(uri, config);
}
}
});
return new ChRootedFileSystem(fs, uri);
} catch (IOException | InterruptedException ex) {
LOG.error("Could not initialize the underlying FileSystem "
+ "object. Exception: " + ex.toString());
}
return null;
}
return new ChRootedFileSystem(fs, uri);
};
}
@Override
@ -273,12 +291,6 @@ FileSystem getTargetFileSystem(URI[] mergeFsURIList)
}
};
if (enableInnerCache) {
// All fs instances are created and cached on startup. The cache is
// readonly after the initialize() so the concurrent access of the cache
// is safe.
cache = innerCache.unmodifiableCache();
}
workingDir = this.getHomeDirectory();
renameStrategy = RenameStrategy.valueOf(
conf.get(Constants.CONFIG_VIEWFS_RENAME_STRATEGY,
@ -311,7 +323,7 @@ public ViewFileSystem(final Configuration conf) throws IOException {
this(FsConstants.VIEWFS_URI, conf);
}
public Path getTrashCanLocation(final Path f) throws FileNotFoundException {
public Path getTrashCanLocation(final Path f) throws IOException {
final InodeTree.ResolveResult<FileSystem> res =
fsState.resolve(getUriPath(f), true);
return res.isInternalDir() ? null : res.targetFileSystem.getHomeDirectory();
@ -767,10 +779,35 @@ public void removeXAttr(Path path, String name) throws IOException {
public void setVerifyChecksum(final boolean verifyChecksum) {
List<InodeTree.MountPoint<FileSystem>> mountPoints =
fsState.getMountPoints();
Map<String, FileSystem> fsMap = initializeMountedFileSystems(mountPoints);
for (InodeTree.MountPoint<FileSystem> mount : mountPoints) {
mount.target.targetFileSystem.setVerifyChecksum(verifyChecksum);
fsMap.get(mount.src).setVerifyChecksum(verifyChecksum);
}
}
/**
* Initialize the target filesystem for all mount points.
* @param mountPoints The mount points
* @return Mapping of mount point and the initialized target filesystems
* @throws RuntimeException when the target file system cannot be initialized
*/
private Map<String, FileSystem> initializeMountedFileSystems(
List<InodeTree.MountPoint<FileSystem>> mountPoints) {
FileSystem fs = null;
Map<String, FileSystem> fsMap = new HashMap<>(mountPoints.size());
for (InodeTree.MountPoint<FileSystem> mount : mountPoints) {
try {
fs = mount.target.getTargetFileSystem();
fsMap.put(mount.src, fs);
} catch (IOException ex) {
String errMsg = "Not able to initialize FileSystem for mount path " +
mount.src + " with exception " + ex;
LOG.error(errMsg);
throw new RuntimeException(errMsg, ex);
}
}
return fsMap;
}
@Override
public long getDefaultBlockSize() {
@ -795,6 +832,9 @@ public long getDefaultBlockSize(Path f) {
return res.targetFileSystem.getDefaultBlockSize(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getDefaultBlockSize");
} catch (IOException e) {
throw new RuntimeException("Not able to initialize fs in "
+ " getDefaultBlockSize for path " + f + " with exception", e);
}
}
@ -806,6 +846,9 @@ public short getDefaultReplication(Path f) {
return res.targetFileSystem.getDefaultReplication(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getDefaultReplication");
} catch (IOException e) {
throw new RuntimeException("Not able to initialize fs in "
+ " getDefaultReplication for path " + f + " with exception", e);
}
}
@ -834,8 +877,9 @@ public QuotaUsage getQuotaUsage(Path f) throws IOException {
public void setWriteChecksum(final boolean writeChecksum) {
List<InodeTree.MountPoint<FileSystem>> mountPoints =
fsState.getMountPoints();
Map<String, FileSystem> fsMap = initializeMountedFileSystems(mountPoints);
for (InodeTree.MountPoint<FileSystem> mount : mountPoints) {
mount.target.targetFileSystem.setWriteChecksum(writeChecksum);
fsMap.get(mount.src).setWriteChecksum(writeChecksum);
}
}
@ -843,9 +887,10 @@ public void setWriteChecksum(final boolean writeChecksum) {
public FileSystem[] getChildFileSystems() {
List<InodeTree.MountPoint<FileSystem>> mountPoints =
fsState.getMountPoints();
Map<String, FileSystem> fsMap = initializeMountedFileSystems(mountPoints);
Set<FileSystem> children = new HashSet<FileSystem>();
for (InodeTree.MountPoint<FileSystem> mountPoint : mountPoints) {
FileSystem targetFs = mountPoint.target.targetFileSystem;
FileSystem targetFs = fsMap.get(mountPoint.src);
children.addAll(Arrays.asList(targetFs.getChildFileSystems()));
}
return children.toArray(new FileSystem[]{});

42
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFs.java
View File

@ -19,10 +19,12 @@
import static org.apache.hadoop.fs.viewfs.Constants.PERMISSION_555;
import com.google.common.base.Function;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
@ -65,6 +67,8 @@
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.Progressable;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
@ -152,6 +156,7 @@
@InterfaceAudience.Public
@InterfaceStability.Evolving /*Evolving for a release,to be changed to Stable */
public class ViewFs extends AbstractFileSystem {
static final Logger LOG = LoggerFactory.getLogger(ViewFs.class);
final long creationTime; // of the the mount table
final UserGroupInformation ugi; // the user/group of user who created mtable
final Configuration config;
@ -212,16 +217,32 @@ public ViewFs(final Configuration conf) throws IOException,
fsState = new InodeTree<AbstractFileSystem>(conf, authority) {
@Override
protected
AbstractFileSystem getTargetFileSystem(final URI uri)
throws URISyntaxException, UnsupportedFileSystemException {
String pathString = uri.getPath();
if (pathString.isEmpty()) {
pathString = "/";
protected Function<URI, AbstractFileSystem> initAndGetTargetFs() {
return new Function<URI, AbstractFileSystem>() {
@Override
public AbstractFileSystem apply(final URI uri) {
AbstractFileSystem fs;
try {
fs = ugi.doAs(
new PrivilegedExceptionAction<AbstractFileSystem>() {
@Override
public AbstractFileSystem run() throws IOException {
return AbstractFileSystem.createFileSystem(uri, config);
}
});
String pathString = uri.getPath();
if (pathString.isEmpty()) {
pathString = "/";
}
return new ChRootedFs(fs, new Path(pathString));
} catch (IOException | URISyntaxException |
InterruptedException ex) {
LOG.error("Could not initialize underlying FileSystem object"
+" for uri " + uri + "with exception: " + ex.toString());
}
return null;
}
return new ChRootedFs(
AbstractFileSystem.createFileSystem(uri, config),
new Path(pathString));
};
}
@Override
@ -624,7 +645,8 @@ public List<Token<?>> getDelegationTokens(String renewer) throws IOException {
List<Token<?>> result = new ArrayList<Token<?>>(initialListSize);
for ( int i = 0; i < mountPoints.size(); ++i ) {
List<Token<?>> tokens =
mountPoints.get(i).target.targetFileSystem.getDelegationTokens(renewer);
mountPoints.get(i).target.getTargetFileSystem()
.getDelegationTokens(renewer);
if (tokens != null) {
result.addAll(tokens);
}

7
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsConfig.java
View File

@ -17,6 +17,7 @@
*/
package org.apache.hadoop.fs.viewfs;
import com.google.common.base.Function;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
@ -47,10 +48,8 @@ class Foo { };
new InodeTree<Foo>(conf, null) {
@Override
protected
Foo getTargetFileSystem(final URI uri)
throws URISyntaxException, UnsupportedFileSystemException {
return null;
protected Function<URI, Foo> initAndGetTargetFs() {
return null;
}
@Override

44
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemBaseTest.java
View File

@ -36,6 +36,7 @@
import static org.apache.hadoop.fs.FileSystemTestHelper.*;
import org.apache.hadoop.fs.permission.AclEntry;
import static org.apache.hadoop.fs.viewfs.Constants.PERMISSION_555;
import static org.apache.hadoop.fs.viewfs.Constants.CONFIG_VIEWFS_ENABLE_INNER_CACHE;
import static org.apache.hadoop.test.GenericTestUtils.*;
import static org.junit.Assert.*;
@ -65,7 +66,6 @@
import org.junit.Test;
import static org.hamcrest.CoreMatchers.containsString;
import static org.junit.Assert.*;
/**
* <p>
@ -1037,6 +1037,8 @@ public void testChildrenFileSystemLeak() throws Exception {
final int cacheSize = TestFileUtil.getCacheSize();
ViewFileSystem viewFs = (ViewFileSystem) FileSystem
.get(new URI("viewfs://" + clusterName + "/"), config);
viewFs.resolvePath(
new Path(String.format("viewfs://%s/%s", clusterName, "/user")));
assertEquals(cacheSize + 1, TestFileUtil.getCacheSize());
viewFs.close();
assertEquals(cacheSize, TestFileUtil.getCacheSize());
@ -1087,4 +1089,44 @@ public void testConfLinkSlash() throws Exception {
}
}
@Test
public void testTargetFileSystemLazyInitialization() throws Exception {
final String clusterName = "cluster" + new Random().nextInt();
Configuration config = new Configuration(conf);
config.setBoolean(CONFIG_VIEWFS_ENABLE_INNER_CACHE, false);
config.setClass("fs.mockfs.impl",
TestChRootedFileSystem.MockFileSystem.class, FileSystem.class);
ConfigUtil.addLink(config, clusterName, "/user",
URI.create("mockfs://mockauth1/mockpath"));
ConfigUtil.addLink(config, clusterName,
"/mock", URI.create("mockfs://mockauth/mockpath"));
final int cacheSize = TestFileUtil.getCacheSize();
ViewFileSystem viewFs = (ViewFileSystem) FileSystem
.get(new URI("viewfs://" + clusterName + "/"), config);
// As no inner file system instance has been initialized,
// cache size will remain the same
// cache is disabled for viewfs scheme, so the viewfs:// instance won't
// go in the cache even after the initialization
assertEquals(cacheSize, TestFileUtil.getCacheSize());
// This resolve path will initialize the file system corresponding
// to the mount table entry of the path "/user"
viewFs.resolvePath(
new Path(String.format("viewfs://%s/%s", clusterName, "/user")));
// Cache size will increase by 1.
assertEquals(cacheSize + 1, TestFileUtil.getCacheSize());
// This resolve path will initialize the file system corresponding
// to the mount table entry of the path "/mock"
viewFs.resolvePath(new Path(String.format("viewfs://%s/%s", clusterName,
"/mock")));
// One more file system instance will get initialized.
assertEquals(cacheSize + 2, TestFileUtil.getCacheSize());
viewFs.close();
// Initialized FileSystem instances will not be removed from cache as
// viewfs inner cache is disabled
assertEquals(cacheSize + 2, TestFileUtil.getCacheSize());
}
}

76
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemHdfs.java
View File

@ -20,7 +20,10 @@
import java.io.IOException;
import java.net.URISyntaxException;
import java.security.PrivilegedExceptionAction;
import java.util.HashMap;
import java.util.Map;
import javax.security.auth.login.LoginException;
import org.apache.hadoop.conf.Configuration;
@ -30,12 +33,17 @@
import org.apache.hadoop.fs.FsConstants;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.contract.ContractTestUtils;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.*;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
public class TestViewFileSystemHdfs extends ViewFileSystemBaseTest {
@ -155,4 +163,72 @@ public void testRenameAccorssFilesystem() throws IOException {
e);
}
}
@Test
public void testTargetFileSystemLazyInitializationWithUgi() throws Exception {
final Map<String, FileSystem> map = new HashMap<>();
final Path user1Path = new Path("/data/user1");
// Scenario - 1: Create FileSystem with the current user context
// Both mkdir and delete should be successful
FileSystem fs = FileSystem.get(FsConstants.VIEWFS_URI, conf);
fs.mkdirs(user1Path);
fs.delete(user1Path, false);
// Scenario - 2: Create FileSystem with the a different user context
final UserGroupInformation userUgi = UserGroupInformation
.createUserForTesting("user1@HADOOP.COM", new String[]{"hadoop"});
userUgi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws IOException {
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
String doAsUserName = ugi.getUserName();
assertEquals(doAsUserName, "user1@HADOOP.COM");
FileSystem viewFS = FileSystem.get(FsConstants.VIEWFS_URI, conf);
map.put("user1", viewFS);
return null;
}
});
// Try creating a directory with the file context created by a different ugi
// Though we are running the mkdir with the current user context, the
// target filesystem will be instantiated by the ugi with which the
// file context was created.
try {
FileSystem otherfs = map.get("user1");
otherfs.mkdirs(user1Path);
fail("This mkdir should fail");
} catch (AccessControlException ex) {
// Exception is expected as the FileSystem was created with ugi of user1
// So when we are trying to access the /user/user1 path for the first
// time, the corresponding file system is initialized and it tries to
// execute the task with ugi with which the FileSystem was created.
}
// Change the permission of /data path so that user1 can create a directory
fsTarget.setOwner(new Path(targetTestRoot, "data"),
"user1", "test2");
// set permission of target to allow rename to target
fsTarget.setPermission(new Path(targetTestRoot, "data"),
new FsPermission("775"));
userUgi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws IOException {
FileSystem viewFS = FileSystem.get(FsConstants.VIEWFS_URI, conf);
map.put("user1", viewFS);
return null;
}
});
// Although we are running with current user context, and current user
// context does not have write permission, we are able to create the
// directory as its using ugi of user1 which has write permission.
FileSystem otherfs = map.get("user1");
otherfs.mkdirs(user1Path);
String owner = otherfs.getFileStatus(user1Path).getOwner();
assertEquals("The owner did not match ", owner, userUgi.getShortUserName());
otherfs.delete(user1Path, false);
}
}

78
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsHdfs.java
View File

@ -21,18 +21,28 @@
import java.io.IOException;
import java.net.URISyntaxException;
import java.security.PrivilegedExceptionAction;
import java.util.HashMap;
import java.util.Map;
import javax.security.auth.login.LoginException;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileContextTestHelper;
import org.apache.hadoop.fs.FsConstants;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
public class TestViewFsHdfs extends ViewFsBaseTest {
@ -85,5 +95,73 @@ public void setUp() throws Exception {
int getExpectedDelegationTokenCount() {
return 8;
}
@Test
public void testTargetFileSystemLazyInitialization() throws Exception {
final Map<String, FileContext> map = new HashMap<>();
final Path user1Path = new Path("/data/user1");
// Scenario - 1: Create FileContext with the current user context
// Both mkdir and delete should be successful
FileContext fs = FileContext.getFileContext(FsConstants.VIEWFS_URI, conf);
fs.mkdir(user1Path, FileContext.DEFAULT_PERM, false);
fs.delete(user1Path, false);
// Scenario - 2: Create FileContext with the a different user context
final UserGroupInformation userUgi = UserGroupInformation
.createUserForTesting("user1@HADOOP.COM", new String[]{"hadoop"});
userUgi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws IOException {
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
String doAsUserName = ugi.getUserName();
assertEquals(doAsUserName, "user1@HADOOP.COM");
FileContext viewFS = FileContext.getFileContext(
FsConstants.VIEWFS_URI, conf);
map.put("user1", viewFS);
return null;
}
});
// Try creating a directory with the file context created by a different ugi
// Though we are running the mkdir with the current user context, the
// target filesystem will be instantiated by the ugi with which the
// file context was created.
try {
FileContext otherfs = map.get("user1");
otherfs.mkdir(user1Path, FileContext.DEFAULT_PERM, false);
fail("This mkdir should fail");
} catch (AccessControlException ex) {
// Exception is expected as the FileContext was created with ugi of user1
// So when we are trying to access the /user/user1 path for the first
// time, the corresponding file system is initialized and it tries to
// execute the task with ugi with which the FileContext was created.
}
// Change the permission of /data path so that user1 can create a directory
fcView.setOwner(new Path("/data"), "user1", "test2");
// set permission of target to allow rename to target
fcView.setPermission(new Path("/data"), new FsPermission("775"));
userUgi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws IOException {
FileContext viewFS = FileContext.getFileContext(
FsConstants.VIEWFS_URI, conf);
map.put("user1", viewFS);
return null;
}
});
// Although we are running with current user context, and current user
// context does not have write permission, we are able to create the
// directory as its using ugi of user1 which has write permission.
FileContext otherfs = map.get("user1");
otherfs.mkdir(user1Path, FileContext.DEFAULT_PERM, false);
String owner = otherfs.getFileStatus(user1Path).getOwner();
assertEquals("The owner did not match ", owner, userUgi.getShortUserName());
otherfs.delete(user1Path, false);
}
}