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HDFS-4124. Refactor INodeDirectory#getExistingPathINodes() to enable returningmore than INode array. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1403304 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Suresh Srinivas 2012-10-29 14:11:04 +00:00
parent 4bcf516d0e
commit 1b3b09d947
3 changed files with 57 additions and 34 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -155,6 +155,9 @@ Trunk (Unreleased)
HDFS-4122. Cleanup HDFS logs and reduce the size of logged messages.
(suresh)
HDFS-4124. Refactor INodeDirectory#getExistingPathINodes() to enable
returningmore than INode array. (Jing Zhao via suresh)
OPTIMIZATIONS
BUG FIXES

35
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -44,10 +44,10 @@ import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.protocol.DirectoryListing;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.FSLimitException;
import org.apache.hadoop.hdfs.protocol.FSLimitException.MaxDirectoryItemsExceededException;
import org.apache.hadoop.hdfs.protocol.FSLimitException.PathComponentTooLongException;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
@ -57,6 +57,7 @@ import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory.INodesInPath;
import org.apache.hadoop.hdfs.util.ByteArray;
import com.google.common.base.Preconditions;
@ -548,8 +549,9 @@ public class FSDirectory implements Closeable {
}
byte[][] dstComponents = INode.getPathComponents(dst);
INode[] dstInodes = new INode[dstComponents.length];
rootDir.getExistingPathINodes(dstComponents, dstInodes, false);
INodesInPath dstInodesInPath = rootDir.getExistingPathINodes(dstComponents,
dstComponents.length, false);
INode[] dstInodes = dstInodesInPath.getINodes();
if (dstInodes[dstInodes.length-1] != null) {
NameNode.stateChangeLog.warn("DIR* FSDirectory.unprotectedRenameTo: "
+"failed to rename "+src+" to "+dst+
@ -564,7 +566,7 @@ public class FSDirectory implements Closeable {
}
// Ensure dst has quota to accommodate rename
verifyQuotaForRename(srcInodes,dstInodes);
verifyQuotaForRename(srcInodes, dstInodes);
INode dstChild = null;
INode srcChild = null;
@ -668,8 +670,9 @@ public class FSDirectory implements Closeable {
throw new IOException(error);
}
final byte[][] dstComponents = INode.getPathComponents(dst);
final INode[] dstInodes = new INode[dstComponents.length];
rootDir.getExistingPathINodes(dstComponents, dstInodes, false);
INodesInPath dstInodesInPath = rootDir.getExistingPathINodes(dstComponents,
dstComponents.length, false);
final INode[] dstInodes = dstInodesInPath.getINodes();
INode dstInode = dstInodes[dstInodes.length - 1];
if (dstInodes.length == 1) {
error = "rename destination cannot be the root";
@ -1443,12 +1446,13 @@ public class FSDirectory implements Closeable {
src = normalizePath(src);
String[] names = INode.getPathNames(src);
byte[][] components = INode.getPathComponents(names);
INode[] inodes = new INode[components.length];
final int lastInodeIndex = inodes.length - 1;
final int lastInodeIndex = components.length - 1;
writeLock();
try {
rootDir.getExistingPathINodes(components, inodes, false);
INodesInPath inodesInPath = rootDir.getExistingPathINodes(components,
components.length, false);
INode[] inodes = inodesInPath.getINodes();
// find the index of the first null in inodes[]
StringBuilder pathbuilder = new StringBuilder();
@ -1518,16 +1522,14 @@ public class FSDirectory implements Closeable {
return true;
}
/**
*/
INode unprotectedMkdir(String src, PermissionStatus permissions,
long timestamp) throws QuotaExceededException,
UnresolvedLinkException {
assert hasWriteLock();
byte[][] components = INode.getPathComponents(src);
INode[] inodes = new INode[components.length];
rootDir.getExistingPathINodes(components, inodes, false);
INodesInPath inodesInPath = rootDir.getExistingPathINodes(components,
components.length, false);
INode[] inodes = inodesInPath.getINodes();
unprotectedMkdir(inodes, inodes.length-1, components[inodes.length-1],
permissions, timestamp);
return inodes[inodes.length-1];
@ -1556,10 +1558,11 @@ public class FSDirectory implements Closeable {
byte[] path = components[components.length-1];
child.setLocalName(path);
cacheName(child);
INode[] inodes = new INode[components.length];
writeLock();
try {
rootDir.getExistingPathINodes(components, inodes, false);
INodesInPath inodesInPath = rootDir.getExistingPathINodes(components,
components.length, false);
INode[] inodes = inodesInPath.getINodes();
return addChild(inodes, inodes.length-1, child, childDiskspace);
} finally {
writeUnlock();

53
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
View File

@ -130,9 +130,9 @@ class INodeDirectory extends INode {
*/
private INode getNode(byte[][] components, boolean resolveLink
) throws UnresolvedLinkException {
INode[] inode = new INode[1];
getExistingPathINodes(components, inode, resolveLink);
return inode[0];
INodesInPath inodesInPath = getExistingPathINodes(components, 1,
resolveLink);
return inodesInPath.inodes[0];
}
/**
@ -180,27 +180,29 @@ class INodeDirectory extends INode {
* fill the array with [rootINode,c1,c2,null]
*
* @param components array of path component name
* @param existing array to fill with existing INodes
* @param numOfINodes number of INodes to return
* @param resolveLink indicates whether UnresolvedLinkException should
* be thrown when the path refers to a symbolic link.
* @return number of existing INodes in the path
* @return the specified number of existing INodes in the path
*/
int getExistingPathINodes(byte[][] components, INode[] existing,
boolean resolveLink) throws UnresolvedLinkException {
INodesInPath getExistingPathINodes(byte[][] components, int numOfINodes,
boolean resolveLink)
throws UnresolvedLinkException {
assert this.compareTo(components[0]) == 0 :
"Incorrect name " + getLocalName() + " expected "
+ (components[0] == null? null: DFSUtil.bytes2String(components[0]));
INodesInPath existing = new INodesInPath(numOfINodes);
INode curNode = this;
int count = 0;
int index = existing.length - components.length;
int index = numOfINodes - components.length;
if (index > 0) {
index = 0;
}
while (count < components.length && curNode != null) {
final boolean lastComp = (count == components.length - 1);
if (index >= 0) {
existing[index] = curNode;
existing.inodes[index] = curNode;
}
if (curNode.isLink() && (!lastComp || (lastComp && resolveLink))) {
final String path = constructPath(components, 0, components.length);
@ -225,7 +227,7 @@ class INodeDirectory extends INode {
count++;
index++;
}
return count;
return existing;
}
/**
@ -246,11 +248,9 @@ class INodeDirectory extends INode {
INode[] getExistingPathINodes(String path, boolean resolveLink)
throws UnresolvedLinkException {
byte[][] components = getPathComponents(path);
INode[] inodes = new INode[components.length];
this.getExistingPathINodes(components, inodes, resolveLink);
return inodes;
INodesInPath inodes = this.getExistingPathINodes(components,
components.length, resolveLink);
return inodes.inodes;
}
/**
@ -341,9 +341,8 @@ class INodeDirectory extends INode {
if (pathComponents.length < 2) // add root
return null;
// Gets the parent INode
INode[] inodes = new INode[2];
getExistingPathINodes(pathComponents, inodes, false);
INode inode = inodes[0];
INodesInPath inodes = getExistingPathINodes(pathComponents, 2, false);
INode inode = inodes.inodes[0];
if (inode == null) {
throw new FileNotFoundException("Parent path does not exist: "+
DFSUtil.byteArray2String(pathComponents));
@ -443,4 +442,22 @@ class INodeDirectory extends INode {
children = null;
return total;
}
/**
* Used by
* {@link INodeDirectory#getExistingPathINodes(byte[][], int, boolean)}.
* Containing INodes information resolved from a given path.
*/
static class INodesInPath {
private INode[] inodes;
public INodesInPath(int number) {
assert (number >= 0);
this.inodes = new INode[number];
}
INode[] getINodes() {
return inodes;
}
}
}