HDFS-7528. Consolidate symlink-related implementation into a single class. Contributed by Haohui Mai.
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Haohui Mai
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316613bdae
commit
0da1330bfd
@ -462,6 +462,9 @@ Release 2.7.0 - UNRELEASED
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HDFS-7536. Remove unused CryptoCodec in org.apache.hadoop.fs.Hdfs.
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(Yi Liu via wheat9)
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HDFS-7528. Consolidate symlink-related implementation into a single class.
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(wheat9)
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OPTIMIZATIONS
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HDFS-7454. Reduce memory footprint for AclEntries in NameNode.
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@ -0,0 +1,128 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.namenode;
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import org.apache.hadoop.fs.InvalidPathException;
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import org.apache.hadoop.fs.UnresolvedLinkException;
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import org.apache.hadoop.fs.permission.FsAction;
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import org.apache.hadoop.fs.permission.FsPermission;
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import org.apache.hadoop.fs.permission.PermissionStatus;
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import org.apache.hadoop.hdfs.DFSUtil;
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import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
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import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
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import java.io.IOException;
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import static org.apache.hadoop.util.Time.now;
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class FSDirSymlinkOp {
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static HdfsFileStatus createSymlinkInt(
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FSNamesystem fsn, String target, final String linkArg,
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PermissionStatus dirPerms, boolean createParent, boolean logRetryCache)
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throws IOException {
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FSDirectory fsd = fsn.getFSDirectory();
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String link = linkArg;
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if (!DFSUtil.isValidName(link)) {
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throw new InvalidPathException("Invalid link name: " + link);
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}
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if (FSDirectory.isReservedName(target) || target.isEmpty()) {
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throw new InvalidPathException("Invalid target name: " + target);
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}
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if (NameNode.stateChangeLog.isDebugEnabled()) {
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NameNode.stateChangeLog.debug("DIR* NameSystem.createSymlink: target="
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+ target + " link=" + link);
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}
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FSPermissionChecker pc = fsn.getPermissionChecker();
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byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(link);
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fsd.writeLock();
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try {
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link = fsd.resolvePath(pc, link, pathComponents);
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final INodesInPath iip = fsd.getINodesInPath4Write(link, false);
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if (!createParent) {
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fsd.verifyParentDir(iip, link);
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}
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if (!fsd.isValidToCreate(link, iip)) {
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throw new IOException(
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"failed to create link " + link +
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" either because the filename is invalid or the file exists");
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}
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if (fsd.isPermissionEnabled()) {
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fsd.checkAncestorAccess(pc, iip, FsAction.WRITE);
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}
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// validate that we have enough inodes.
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fsn.checkFsObjectLimit();
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// add symbolic link to namespace
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addSymlink(fsd, link, iip, target, dirPerms, createParent, logRetryCache);
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} finally {
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fsd.writeUnlock();
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}
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NameNode.getNameNodeMetrics().incrCreateSymlinkOps();
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return fsd.getAuditFileInfo(link, false);
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}
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static INodeSymlink unprotectedAddSymlink(
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FSDirectory fsd, INodesInPath iip, long id, String target, long mtime,
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long atime, PermissionStatus perm)
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throws UnresolvedLinkException, QuotaExceededException {
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assert fsd.hasWriteLock();
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final INodeSymlink symlink = new INodeSymlink(id, null, perm, mtime, atime,
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target);
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return fsd.addINode(iip, symlink) ? symlink : null;
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}
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/**
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* Add the given symbolic link to the fs. Record it in the edits log.
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*/
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private static INodeSymlink addSymlink(
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FSDirectory fsd, String path, INodesInPath iip, String target,
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PermissionStatus dirPerms, boolean createParent, boolean logRetryCache)
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throws IOException {
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final long mtime = now();
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if (createParent) {
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INodesInPath parentIIP = iip.getParentINodesInPath();
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if (parentIIP == null || (parentIIP = FSDirMkdirOp.mkdirsRecursively(
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fsd,
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parentIIP, dirPerms, true, mtime)) == null) {
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return null;
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} else {
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iip = INodesInPath.append(parentIIP, null, iip.getLastLocalName());
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}
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}
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final String userName = dirPerms.getUserName();
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long id = fsd.allocateNewInodeId();
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PermissionStatus perm = new PermissionStatus(
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userName, null, FsPermission.getDefault());
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INodeSymlink newNode =
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unprotectedAddSymlink(fsd, iip, id, target, mtime, mtime, perm);
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if (newNode == null) {
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NameNode.stateChangeLog.info("addSymlink: failed to add " + path);
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return null;
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}
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fsd.getEditLog().logSymlink(path, target, mtime, mtime, newNode,
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logRetryCache);
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if(NameNode.stateChangeLog.isDebugEnabled()) {
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NameNode.stateChangeLog.debug("addSymlink: " + path + " is added");
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}
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return newNode;
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}
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}
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@ -860,7 +860,7 @@ static String getFullPathName(INode inode) {
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* @param iip the INodesInPath instance containing all the ancestral INodes
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* @throws QuotaExceededException is thrown if it violates quota limit
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*/
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private boolean addINode(INodesInPath iip, INode child)
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boolean addINode(INodesInPath iip, INode child)
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throws QuotaExceededException, UnresolvedLinkException {
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child.setLocalName(iip.getLastLocalName());
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cacheName(child);
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@ -1192,29 +1192,6 @@ void reset() {
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}
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}
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/**
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* Add the specified path into the namespace.
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*/
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INodeSymlink addSymlink(INodesInPath iip, long id, String target,
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long mtime, long atime, PermissionStatus perm)
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throws UnresolvedLinkException, QuotaExceededException {
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writeLock();
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try {
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return unprotectedAddSymlink(iip, id, target, mtime, atime, perm);
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} finally {
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writeUnlock();
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}
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}
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INodeSymlink unprotectedAddSymlink(INodesInPath iip, long id, String target,
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long mtime, long atime, PermissionStatus perm)
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throws UnresolvedLinkException, QuotaExceededException {
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assert hasWriteLock();
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final INodeSymlink symlink = new INodeSymlink(id, null, perm, mtime, atime,
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target);
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return addINode(iip, symlink) ? symlink : null;
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}
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boolean isInAnEZ(INodesInPath iip)
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throws UnresolvedLinkException, SnapshotAccessControlException {
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readLock();
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@ -360,12 +360,12 @@ private long applyEditLogOp(FSEditLogOp op, FSDirectory fsDir,
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// add to the file tree
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inodeId = getAndUpdateLastInodeId(addCloseOp.inodeId, logVersion,
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lastInodeId);
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newFile = fsDir.unprotectedAddFile(inodeId,
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iip, addCloseOp.permissions, addCloseOp.aclEntries,
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addCloseOp.xAttrs,
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replication, addCloseOp.mtime, addCloseOp.atime,
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addCloseOp.blockSize, true, addCloseOp.clientName,
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addCloseOp.clientMachine, addCloseOp.storagePolicyId);
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newFile = fsDir.unprotectedAddFile(
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inodeId, iip, addCloseOp.permissions, addCloseOp.aclEntries,
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addCloseOp.xAttrs, replication, addCloseOp.mtime,
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addCloseOp.atime, addCloseOp.blockSize, true,
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addCloseOp.clientName, addCloseOp.clientMachine,
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addCloseOp.storagePolicyId);
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iip = INodesInPath.replace(iip, iip.length() - 1, newFile);
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fsNamesys.leaseManager.addLease(addCloseOp.clientName, path);
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@ -587,8 +587,8 @@ fsDir, renameReservedPathsOnUpgrade(timesOp.path, logVersion),
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final String path = renameReservedPathsOnUpgrade(symlinkOp.path,
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logVersion);
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final INodesInPath iip = fsDir.getINodesInPath(path, false);
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fsDir.unprotectedAddSymlink(iip, inodeId,
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symlinkOp.value, symlinkOp.mtime, symlinkOp.atime,
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FSDirSymlinkOp.unprotectedAddSymlink(fsDir, iip, inodeId, symlinkOp.value,
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symlinkOp.mtime, symlinkOp.atime,
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symlinkOp.permissionStatus);
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if (toAddRetryCache) {
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@ -168,7 +168,6 @@
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import org.apache.hadoop.hdfs.HdfsConfiguration;
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import org.apache.hadoop.hdfs.UnknownCryptoProtocolVersionException;
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import org.apache.hadoop.hdfs.XAttrHelper;
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import org.apache.hadoop.hdfs.protocol.AclException;
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import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
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import org.apache.hadoop.hdfs.protocol.Block;
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import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
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@ -1918,60 +1917,23 @@ void setTimes(String src, long mtime, long atime) throws IOException {
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void createSymlink(String target, String link,
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PermissionStatus dirPerms, boolean createParent, boolean logRetryCache)
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throws IOException {
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if (!DFSUtil.isValidName(link)) {
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throw new InvalidPathException("Invalid link name: " + link);
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}
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if (FSDirectory.isReservedName(target)) {
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throw new InvalidPathException("Invalid target name: " + target);
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}
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try {
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createSymlinkInt(target, link, dirPerms, createParent, logRetryCache);
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} catch (AccessControlException e) {
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logAuditEvent(false, "createSymlink", link, target, null);
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throw e;
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}
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}
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private void createSymlinkInt(String target, final String linkArg,
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PermissionStatus dirPerms, boolean createParent, boolean logRetryCache)
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throws IOException {
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String link = linkArg;
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if (NameNode.stateChangeLog.isDebugEnabled()) {
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NameNode.stateChangeLog.debug("DIR* NameSystem.createSymlink: target="
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+ target + " link=" + link);
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}
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HdfsFileStatus resultingStat = null;
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FSPermissionChecker pc = getPermissionChecker();
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waitForLoadingFSImage();
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HdfsFileStatus auditStat = null;
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checkOperation(OperationCategory.WRITE);
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byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(link);
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writeLock();
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try {
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checkOperation(OperationCategory.WRITE);
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checkNameNodeSafeMode("Cannot create symlink " + link);
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link = dir.resolvePath(pc, link, pathComponents);
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final INodesInPath iip = dir.getINodesInPath4Write(link, false);
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if (!createParent) {
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dir.verifyParentDir(iip, link);
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}
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if (!dir.isValidToCreate(link, iip)) {
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throw new IOException("failed to create link " + link
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+" either because the filename is invalid or the file exists");
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}
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if (isPermissionEnabled) {
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dir.checkAncestorAccess(pc, iip, FsAction.WRITE);
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}
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// validate that we have enough inodes.
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checkFsObjectLimit();
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// add symbolic link to namespace
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addSymlink(link, iip, target, dirPerms, createParent, logRetryCache);
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resultingStat = getAuditFileInfo(link, false);
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auditStat = FSDirSymlinkOp.createSymlinkInt(this, target, link, dirPerms,
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createParent, logRetryCache);
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} catch (AccessControlException e) {
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logAuditEvent(false, "createSymlink", link, target, null);
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throw e;
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} finally {
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writeUnlock();
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}
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getEditLog().logSync();
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logAuditEvent(true, "createSymlink", linkArg, target, resultingStat);
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logAuditEvent(true, "createSymlink", link, target, auditStat);
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}
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/**
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@ -4360,43 +4322,6 @@ private void closeFile(String path, INodeFile file) {
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}
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}
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/**
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* Add the given symbolic link to the fs. Record it in the edits log.
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*/
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private INodeSymlink addSymlink(String path, INodesInPath iip, String target,
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PermissionStatus dirPerms,
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boolean createParent, boolean logRetryCache)
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throws UnresolvedLinkException, FileAlreadyExistsException,
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QuotaExceededException, SnapshotAccessControlException, AclException {
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waitForLoadingFSImage();
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final long modTime = now();
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if (createParent) {
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INodesInPath parentIIP = iip.getParentINodesInPath();
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if (parentIIP == null || (parentIIP = FSDirMkdirOp.mkdirsRecursively(dir,
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parentIIP, dirPerms, true, modTime)) == null) {
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return null;
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} else {
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iip = INodesInPath.append(parentIIP, null, iip.getLastLocalName());
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}
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}
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final String userName = dirPerms.getUserName();
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long id = dir.allocateNewInodeId();
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INodeSymlink newNode = dir.addSymlink(iip, id, target, modTime, modTime,
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new PermissionStatus(userName, null, FsPermission.getDefault()));
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if (newNode == null) {
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NameNode.stateChangeLog.info("addSymlink: failed to add " + path);
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return null;
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}
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getEditLog().logSymlink(path, target, modTime, modTime, newNode,
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logRetryCache);
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if(NameNode.stateChangeLog.isDebugEnabled()) {
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NameNode.stateChangeLog.debug("addSymlink: " + path + " is added");
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}
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return newNode;
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}
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/**
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* Periodically calls hasAvailableResources of NameNodeResourceChecker, and if
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* there are found to be insufficient resources available, causes the NN to
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@ -1142,7 +1142,6 @@ public void createSymlink(String target, String link, FsPermission dirPerms,
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return; // Return previous response
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}
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metrics.incrCreateSymlinkOps();
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/* We enforce the MAX_PATH_LENGTH limit even though a symlink target
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* URI may refer to a non-HDFS file system.
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*/
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@ -1151,9 +1150,7 @@ public void createSymlink(String target, String link, FsPermission dirPerms,
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" character limit");
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}
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if ("".equals(target)) {
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throw new IOException("Invalid symlink target");
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}
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final UserGroupInformation ugi = getRemoteUser();
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boolean success = false;
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