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HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal via cmccabe) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1609384 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Colin McCabe 2014-07-10 04:03:02 +00:00
parent 8044a12ac0
commit d9c5f20333
3 changed files with 80 additions and 6 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
View File

@ -876,6 +876,9 @@ Release 2.5.0 - UNRELEASED
HDFS-6618. FSNamesystem#delete drops the FSN lock between removing INodes
from the tree and deleting them from the inode map (kihwal via cmccabe)
HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal
via cmccabe)
Release 2.4.1 - 2014-06-23
INCOMPATIBLE CHANGES

25
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
View File

@ -2764,9 +2764,10 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
checkOperation(OperationCategory.READ);
src = FSDirectory.resolvePath(src, pathComponents, dir);
LocatedBlock[] onRetryBlock = new LocatedBlock[1];
final INodeFile pendingFile = analyzeFileState(
FileState fileState = analyzeFileState(
src, fileId, clientName, previous, onRetryBlock);
src = pendingFile.getFullPathName();
final INodeFile pendingFile = fileState.inode;
src = fileState.path;
if (onRetryBlock[0] != null && onRetryBlock[0].getLocations().length > 0) {
// This is a retry. Just return the last block if having locations.
@ -2802,8 +2803,10 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
// Run the full analysis again, since things could have changed
// while chooseTarget() was executing.
LocatedBlock[] onRetryBlock = new LocatedBlock[1];
final INodeFile pendingFile =
FileState fileState =
analyzeFileState(src, fileId, clientName, previous, onRetryBlock);
final INodeFile pendingFile = fileState.inode;
src = fileState.path;
if (onRetryBlock[0] != null) {
if (onRetryBlock[0].getLocations().length > 0) {
@ -2839,7 +2842,17 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
return makeLocatedBlock(newBlock, targets, offset);
}
INodeFile analyzeFileState(String src,
static class FileState {
public final INodeFile inode;
public final String path;
public FileState(INodeFile inode, String fullPath) {
this.inode = inode;
this.path = fullPath;
}
}
FileState analyzeFileState(String src,
long fileId,
String clientName,
ExtendedBlock previous,
@ -2927,7 +2940,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
onRetryBlock[0] = makeLocatedBlock(lastBlockInFile,
((BlockInfoUnderConstruction)lastBlockInFile).getExpectedStorageLocations(),
offset);
return pendingFile;
return new FileState(pendingFile, src);
} else {
// Case 3
throw new IOException("Cannot allocate block in " + src + ": " +
@ -2940,7 +2953,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
if (!checkFileProgress(pendingFile, false)) {
throw new NotReplicatedYetException("Not replicated yet: " + src);
}
return pendingFile;
return new FileState(pendingFile, src);
}
LocatedBlock makeLocatedBlock(Block blk, DatanodeStorageInfo[] locs,

58
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeleteRace.java
View File

@ -146,4 +146,62 @@ public class TestDeleteRace {
}
}
}
private class RenameThread extends Thread {
private FileSystem fs;
private Path from;
private Path to;
RenameThread(FileSystem fs, Path from, Path to) {
this.fs = fs;
this.from = from;
this.to = to;
}
@Override
public void run() {
try {
Thread.sleep(1000);
LOG.info("Renaming " + from + " to " + to);
fs.rename(from, to);
LOG.info("Renamed " + from + " to " + to);
} catch (Exception e) {
LOG.info(e);
}
}
}
@Test
public void testRenameRace() throws Exception {
try {
conf.setClass(DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_KEY,
SlowBlockPlacementPolicy.class, BlockPlacementPolicy.class);
cluster = new MiniDFSCluster.Builder(conf).build();
FileSystem fs = cluster.getFileSystem();
Path dirPath1 = new Path("/testRenameRace1");
Path dirPath2 = new Path("/testRenameRace2");
Path filePath = new Path("/testRenameRace1/file1");
fs.mkdirs(dirPath1);
FSDataOutputStream out = fs.create(filePath);
Thread renameThread = new RenameThread(fs, dirPath1, dirPath2);
renameThread.start();
// write data and close to make sure a block is allocated.
out.write(new byte[32], 0, 32);
out.close();
// Restart name node so that it replays edit. If old path was
// logged in edit, it will fail to come up.
cluster.restartNameNode(0);
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}