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HDFS-4873. callGetBlockLocations returns incorrect number of blocks for snapshotted files. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1491957 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2013-06-11 21:03:09 +00:00
parent 0c88f38be8
commit 390eca2cde
5 changed files with 180 additions and 51 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1072,6 +1072,9 @@ Release 2.1.0-beta - UNRELEASED
HDFS-4877. Snapshot: fix the scenario where a directory is renamed under
its prior descendant. (jing9)
HDFS-4873. callGetBlockLocations returns incorrect number of blocks for
snapshotted files. (jing9)
Release 2.0.5-alpha - 06/06/2013
INCOMPATIBLE CHANGES

43
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -713,6 +713,22 @@ public class BlockManager {
return results;
}
private LocatedBlock createLocatedBlock(final BlockInfo[] blocks,
final long endPos, final AccessMode mode) throws IOException {
int curBlk = 0;
long curPos = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
long blkSize = blocks[curBlk].getNumBytes();
if (curPos + blkSize >= endPos) {
break;
}
curPos += blkSize;
}
return createLocatedBlock(blocks[curBlk], curPos, mode);
}
private LocatedBlock createLocatedBlock(final BlockInfo blk, final long pos,
final BlockTokenSecretManager.AccessMode mode) throws IOException {
final LocatedBlock lb = createLocatedBlock(blk, pos);
@ -773,9 +789,9 @@ public class BlockManager {
/** Create a LocatedBlocks. */
public LocatedBlocks createLocatedBlocks(final BlockInfo[] blocks,
final long fileSizeExcludeBlocksUnderConstruction,
final boolean isFileUnderConstruction,
final long offset, final long length, final boolean needBlockToken
) throws IOException {
final boolean isFileUnderConstruction, final long offset,
final long length, final boolean needBlockToken, final boolean inSnapshot)
throws IOException {
assert namesystem.hasReadOrWriteLock();
if (blocks == null) {
return null;
@ -790,14 +806,23 @@ public class BlockManager {
final List<LocatedBlock> locatedblocks = createLocatedBlockList(
blocks, offset, length, Integer.MAX_VALUE, mode);
final BlockInfo last = blocks[blocks.length - 1];
final long lastPos = last.isComplete()?
fileSizeExcludeBlocksUnderConstruction - last.getNumBytes()
: fileSizeExcludeBlocksUnderConstruction;
final LocatedBlock lastlb = createLocatedBlock(last, lastPos, mode);
final LocatedBlock lastlb;
final boolean isComplete;
if (!inSnapshot) {
final BlockInfo last = blocks[blocks.length - 1];
final long lastPos = last.isComplete()?
fileSizeExcludeBlocksUnderConstruction - last.getNumBytes()
: fileSizeExcludeBlocksUnderConstruction;
lastlb = createLocatedBlock(last, lastPos, mode);
isComplete = last.isComplete();
} else {
lastlb = createLocatedBlock(blocks,
fileSizeExcludeBlocksUnderConstruction, mode);
isComplete = true;
}
return new LocatedBlocks(
fileSizeExcludeBlocksUnderConstruction, isFileUnderConstruction,
locatedblocks, lastlb, last.isComplete());
locatedblocks, lastlb, isComplete);
}
}

70
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -2536,46 +2536,40 @@ public class FSDirectory implements Closeable {
node.getId());
}
/**
* Create FileStatus with location info by file INode
*/
private HdfsLocatedFileStatus createLocatedFileStatus(
byte[] path, INode node, Snapshot snapshot) throws IOException {
assert hasReadLock();
long size = 0; // length is zero for directories
short replication = 0;
long blocksize = 0;
LocatedBlocks loc = null;
if (node.isFile()) {
final INodeFile fileNode = node.asFile();
size = fileNode.computeFileSize(snapshot);
replication = fileNode.getFileReplication(snapshot);
blocksize = fileNode.getPreferredBlockSize();
/**
* Create FileStatus with location info by file INode
*/
private HdfsLocatedFileStatus createLocatedFileStatus(byte[] path,
INode node, Snapshot snapshot) throws IOException {
assert hasReadLock();
long size = 0; // length is zero for directories
short replication = 0;
long blocksize = 0;
LocatedBlocks loc = null;
if (node.isFile()) {
final INodeFile fileNode = node.asFile();
size = fileNode.computeFileSize(snapshot);
replication = fileNode.getFileReplication(snapshot);
blocksize = fileNode.getPreferredBlockSize();
final boolean isUc = fileNode.isUnderConstruction();
final long fileSize = snapshot == null && isUc?
fileNode.computeFileSizeNotIncludingLastUcBlock(): size;
loc = getFSNamesystem().getBlockManager().createLocatedBlocks(
fileNode.getBlocks(), fileSize, isUc, 0L, size, false);
if (loc==null) {
loc = new LocatedBlocks();
}
}
return new HdfsLocatedFileStatus(
size,
node.isDirectory(),
replication,
blocksize,
node.getModificationTime(snapshot),
node.getAccessTime(snapshot),
node.getFsPermission(snapshot),
node.getUserName(snapshot),
node.getGroupName(snapshot),
node.isSymlink() ? node.asSymlink().getSymlink() : null,
path,
node.getId(),
loc);
final boolean inSnapshot = snapshot != null;
final boolean isUc = inSnapshot ? false : fileNode.isUnderConstruction();
final long fileSize = !inSnapshot && isUc ?
fileNode.computeFileSizeNotIncludingLastUcBlock() : size;
loc = getFSNamesystem().getBlockManager().createLocatedBlocks(
fileNode.getBlocks(), fileSize, isUc, 0L, size, false,
inSnapshot);
if (loc == null) {
loc = new LocatedBlocks();
}
}
return new HdfsLocatedFileStatus(size, node.isDirectory(), replication,
blocksize, node.getModificationTime(snapshot),
node.getAccessTime(snapshot), node.getFsPermission(snapshot),
node.getUserName(snapshot), node.getGroupName(snapshot),
node.isSymlink() ? node.asSymlink().getSymlink() : null, path,
node.getId(), loc);
}
/**

13
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
View File

@ -179,6 +179,8 @@ import org.apache.hadoop.hdfs.server.namenode.ha.HAState;
import org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer;
import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMBean;
import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
import org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithSnapshot;
import org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithSnapshot.FileDiff;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectorySnapshottable.SnapshotDiffInfo;
import org.apache.hadoop.hdfs.server.namenode.snapshot.INodeFileWithSnapshot;
@ -1406,11 +1408,18 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
dir.setTimes(src, inode, -1, now, false, iip.getLatestSnapshot());
}
}
final long fileSize = iip.getPathSnapshot() != null?
final long fileSize = iip.isSnapshot() ?
inode.computeFileSize(iip.getPathSnapshot())
: inode.computeFileSizeNotIncludingLastUcBlock();
boolean isUc = inode.isUnderConstruction();
if (iip.isSnapshot()) {
// if src indicates a snapshot file, we need to make sure the returned
// blocks do not exceed the size of the snapshot file.
length = Math.min(length, fileSize - offset);
isUc = false;
}
return blockManager.createLocatedBlocks(inode.getBlocks(), fileSize,
inode.isUnderConstruction(), offset, length, needBlockToken);
isUc, offset, length, needBlockToken, iip.isSnapshot());
} finally {
if (isReadOp) {
readUnlock();

98
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestINodeFileUnderConstructionWithSnapshot.java
View File

@ -18,22 +18,28 @@
package org.apache.hadoop.hdfs.server.namenode.snapshot;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.EnumSet;
import java.util.List;
import java.util.Random;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSClientAdapter;
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.client.HdfsDataOutputStream;
import org.apache.hadoop.hdfs.client.HdfsDataOutputStream.SyncFlag;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.INode;
@ -183,4 +189,96 @@ public class TestINodeFileUnderConstructionWithSnapshot {
// re-check the size of nodeInDeleted_S1
assertEquals(BLOCKSIZE * 3, fileNode.computeFileSize(s1));
}
/**
* call DFSClient#callGetBlockLocations(...) for snapshot file. Make sure only
* blocks within the size range are returned.
*/
@Test
public void testGetBlockLocations() throws Exception {
final Path root = new Path("/");
final Path file = new Path("/file");
DFSTestUtil.createFile(hdfs, file, BLOCKSIZE, REPLICATION, seed);
// take a snapshot on root
SnapshotTestHelper.createSnapshot(hdfs, root, "s1");
final Path fileInSnapshot = SnapshotTestHelper.getSnapshotPath(root,
"s1", file.getName());
FileStatus status = hdfs.getFileStatus(fileInSnapshot);
// make sure we record the size for the file
assertEquals(BLOCKSIZE, status.getLen());
// append data to file
DFSTestUtil.appendFile(hdfs, file, BLOCKSIZE - 1);
status = hdfs.getFileStatus(fileInSnapshot);
// the size of snapshot file should still be BLOCKSIZE
assertEquals(BLOCKSIZE, status.getLen());
// the size of the file should be (2 * BLOCKSIZE - 1)
status = hdfs.getFileStatus(file);
assertEquals(BLOCKSIZE * 2 - 1, status.getLen());
// call DFSClient#callGetBlockLocations for the file in snapshot
LocatedBlocks blocks = DFSClientAdapter.callGetBlockLocations(
cluster.getNameNodeRpc(), fileInSnapshot.toString(), 0, Long.MAX_VALUE);
List<LocatedBlock> blockList = blocks.getLocatedBlocks();
// should be only one block
assertEquals(BLOCKSIZE, blocks.getFileLength());
assertEquals(1, blockList.size());
// check the last block
LocatedBlock lastBlock = blocks.getLastLocatedBlock();
assertEquals(0, lastBlock.getStartOffset());
assertEquals(BLOCKSIZE, lastBlock.getBlockSize());
// take another snapshot
SnapshotTestHelper.createSnapshot(hdfs, root, "s2");
final Path fileInSnapshot2 = SnapshotTestHelper.getSnapshotPath(root,
"s2", file.getName());
// append data to file without closing
HdfsDataOutputStream out = appendFileWithoutClosing(file, BLOCKSIZE);
out.hsync(EnumSet.of(SyncFlag.UPDATE_LENGTH));
status = hdfs.getFileStatus(fileInSnapshot2);
// the size of snapshot file should be BLOCKSIZE*2-1
assertEquals(BLOCKSIZE * 2 - 1, status.getLen());
// the size of the file should be (3 * BLOCKSIZE - 1)
status = hdfs.getFileStatus(file);
assertEquals(BLOCKSIZE * 3 - 1, status.getLen());
blocks = DFSClientAdapter.callGetBlockLocations(cluster.getNameNodeRpc(),
fileInSnapshot2.toString(), 0, Long.MAX_VALUE);
assertFalse(blocks.isUnderConstruction());
assertTrue(blocks.isLastBlockComplete());
blockList = blocks.getLocatedBlocks();
// should be 2 blocks
assertEquals(BLOCKSIZE * 2 - 1, blocks.getFileLength());
assertEquals(2, blockList.size());
// check the last block
lastBlock = blocks.getLastLocatedBlock();
assertEquals(BLOCKSIZE, lastBlock.getStartOffset());
assertEquals(BLOCKSIZE, lastBlock.getBlockSize());
blocks = DFSClientAdapter.callGetBlockLocations(cluster.getNameNodeRpc(),
fileInSnapshot2.toString(), BLOCKSIZE, 0);
blockList = blocks.getLocatedBlocks();
assertEquals(1, blockList.size());
// check blocks for file being written
blocks = DFSClientAdapter.callGetBlockLocations(cluster.getNameNodeRpc(),
file.toString(), 0, Long.MAX_VALUE);
blockList = blocks.getLocatedBlocks();
assertEquals(3, blockList.size());
assertTrue(blocks.isUnderConstruction());
assertFalse(blocks.isLastBlockComplete());
lastBlock = blocks.getLastLocatedBlock();
assertEquals(BLOCKSIZE * 2, lastBlock.getStartOffset());
assertEquals(BLOCKSIZE - 1, lastBlock.getBlockSize());
out.close();
}
}