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HDFS-6825. Edit log corruption due to delayed block removal. Contributed by Yongjun Zhang. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618689 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andrew Wang 2014-08-18 18:10:50 +00:00
parent f7593e1650
commit 9b38a6ab23
8 changed files with 235 additions and 42 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -253,6 +253,9 @@ Release 2.6.0 - UNRELEASED
HDFS-6783. Fix HDFS CacheReplicationMonitor rescan logic. (Yi Liu and Colin Patrick McCabe via umamahesh)
HDFS-6825. Edit log corruption due to delayed block removal.
(Yongjun Zhang via wang)
Release 2.5.0 - UNRELEASED
INCOMPATIBLE CHANGES

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoUnderConstruction.java
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@ -373,6 +373,7 @@ private void appendUCParts(StringBuilder sb) {
sb.append("{blockUCState=").append(blockUCState)
.append(", primaryNodeIndex=").append(primaryNodeIndex)
.append(", replicas=[");
if (replicas != null) {
Iterator<ReplicaUnderConstruction> iter = replicas.iterator();
if (iter.hasNext()) {
iter.next().appendStringTo(sb);
@ -381,6 +382,7 @@ private void appendUCParts(StringBuilder sb) {
iter.next().appendStringTo(sb);
}
}
}
sb.append("]}");
}
}

50
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -4303,7 +4303,30 @@ void commitBlockSynchronization(ExtendedBlock lastblock,
throw new IOException("Block (=" + lastblock + ") not found");
}
}
INodeFile iFile = ((INode)storedBlock.getBlockCollection()).asFile();
//
// The implementation of delete operation (see @deleteInternal method)
// first removes the file paths from namespace, and delays the removal
// of blocks to later time for better performance. When
// commitBlockSynchronization (this method) is called in between, the
// blockCollection of storedBlock could have been assigned to null by
// the delete operation, throw IOException here instead of NPE; if the
// file path is already removed from namespace by the delete operation,
// throw FileNotFoundException here, so not to proceed to the end of
// this method to add a CloseOp to the edit log for an already deleted
// file (See HDFS-6825).
//
BlockCollection blockCollection = storedBlock.getBlockCollection();
if (blockCollection == null) {
throw new IOException("The blockCollection of " + storedBlock
+ " is null, likely because the file owning this block was"
+ " deleted and the block removal is delayed");
}
INodeFile iFile = ((INode)blockCollection).asFile();
if (isFileDeleted(iFile)) {
throw new FileNotFoundException("File not found: "
+ iFile.getFullPathName() + ", likely due to delayed block"
+ " removal");
}
if (!iFile.isUnderConstruction() || storedBlock.isComplete()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Unexpected block (=" + lastblock
@ -6300,9 +6323,28 @@ private long nextBlockId() throws IOException {
private boolean isFileDeleted(INodeFile file) {
// Not in the inodeMap or in the snapshot but marked deleted.
if (dir.getInode(file.getId()) == null ||
file.getParent() == null || (file.isWithSnapshot() &&
file.getFileWithSnapshotFeature().isCurrentFileDeleted())) {
if (dir.getInode(file.getId()) == null) {
return true;
}
// look at the path hierarchy to see if one parent is deleted by recursive
// deletion
INode tmpChild = file;
INodeDirectory tmpParent = file.getParent();
while (true) {
if (tmpParent == null ||
tmpParent.searchChildren(tmpChild.getLocalNameBytes()) < 0) {
return true;
}
if (tmpParent.isRoot()) {
break;
}
tmpChild = tmpParent;
tmpParent = tmpParent.getParent();
}
if (file.isWithSnapshot() &&
file.getFileWithSnapshotFeature().isCurrentFileDeleted()) {
return true;
}
return false;

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
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@ -161,7 +161,7 @@ DirectoryWithQuotaFeature addDirectoryWithQuotaFeature(
return quota;
}
private int searchChildren(byte[] name) {
int searchChildren(byte[] name) {
return children == null? -1: Collections.binarySearch(children, name);
}

32
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/DFSTestUtil.java
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@ -44,6 +44,9 @@
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
@ -1320,4 +1323,33 @@ public void close() throws IOException {
sockDir.close();
}
}
/**
* @return the node which is expected to run the recovery of the
* given block, which is known to be under construction inside the
* given NameNOde.
*/
public static DatanodeDescriptor getExpectedPrimaryNode(NameNode nn,
ExtendedBlock blk) {
BlockManager bm0 = nn.getNamesystem().getBlockManager();
BlockInfo storedBlock = bm0.getStoredBlock(blk.getLocalBlock());
assertTrue("Block " + blk + " should be under construction, " +
"got: " + storedBlock,
storedBlock instanceof BlockInfoUnderConstruction);
BlockInfoUnderConstruction ucBlock =
(BlockInfoUnderConstruction)storedBlock;
// We expect that the replica with the most recent heart beat will be
// the one to be in charge of the synchronization / recovery protocol.
final DatanodeStorageInfo[] storages = ucBlock.getExpectedStorageLocations();
DatanodeStorageInfo expectedPrimary = storages[0];
long mostRecentLastUpdate = expectedPrimary.getDatanodeDescriptor().getLastUpdate();
for (int i = 1; i < storages.length; i++) {
final long lastUpdate = storages[i].getDatanodeDescriptor().getLastUpdate();
if (lastUpdate > mostRecentLastUpdate) {
expectedPrimary = storages[i];
mostRecentLastUpdate = lastUpdate;
}
}
return expectedPrimary.getDatanodeDescriptor();
}
}

11
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockSynchronization.java
View File

@ -50,6 +50,17 @@ private FSNamesystem makeNameSystemSpy(Block block, INodeFile file)
FSNamesystem namesystem = new FSNamesystem(conf, image);
namesystem.setImageLoaded(true);
// set file's parent as root and put the file to inodeMap, so
// FSNamesystem's isFileDeleted() method will return false on this file
if (file.getParent() == null) {
INodeDirectory parent = mock(INodeDirectory.class);
parent.setLocalName(new byte[0]);
parent.addChild(file);
file.setParent(parent);
}
namesystem.dir.getINodeMap().put(file);
FSNamesystem namesystemSpy = spy(namesystem);
BlockInfoUnderConstruction blockInfo = new BlockInfoUnderConstruction(
block, 1, HdfsServerConstants.BlockUCState.UNDER_CONSTRUCTION, targets);

133
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeleteRace.java
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@ -18,7 +18,9 @@
package org.apache.hadoop.hdfs.server.namenode;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
@ -27,19 +29,30 @@
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.AppendTestUtil;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.StorageType;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.GenericTestUtils.DelayAnswer;
import org.junit.Assert;
import org.junit.Test;
import org.mockito.Mockito;
import org.mockito.internal.util.reflection.Whitebox;
@ -49,6 +62,7 @@
* whole duration.
*/
public class TestDeleteRace {
private static final int BLOCK_SIZE = 4096;
private static final Log LOG = LogFactory.getLog(TestDeleteRace.class);
private static final Configuration conf = new HdfsConfiguration();
private MiniDFSCluster cluster;
@ -201,7 +215,126 @@ public void testRenameRace() throws Exception {
cluster.shutdown();
}
}
}
/**
* Test race between delete operation and commitBlockSynchronization method.
* See HDFS-6825.
* @param hasSnapshot
* @throws Exception
*/
private void testDeleteAndCommitBlockSynchronizationRace(boolean hasSnapshot)
throws Exception {
LOG.info("Start testing, hasSnapshot: " + hasSnapshot);
final String testPaths[] = {
"/test-file",
"/testdir/testdir1/test-file"
};
final Path rootPath = new Path("/");
final Configuration conf = new Configuration();
// Disable permissions so that another user can recover the lease.
conf.setBoolean(DFSConfigKeys.DFS_PERMISSIONS_ENABLED_KEY, false);
conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
FSDataOutputStream stm = null;
Map<DataNode, DatanodeProtocolClientSideTranslatorPB> dnMap =
new HashMap<DataNode, DatanodeProtocolClientSideTranslatorPB>();
try {
cluster = new MiniDFSCluster.Builder(conf)
.numDataNodes(3)
.build();
cluster.waitActive();
DistributedFileSystem fs = cluster.getFileSystem();
int stId = 0;
for (String testPath : testPaths) {
LOG.info("test on " + testPath + " snapshot: " + hasSnapshot);
Path fPath = new Path(testPath);
//find grandest non-root parent
Path grandestNonRootParent = fPath;
while (!grandestNonRootParent.getParent().equals(rootPath)) {
grandestNonRootParent = grandestNonRootParent.getParent();
}
stm = fs.create(fPath);
LOG.info("test on " + testPath + " created " + fPath);
// write a half block
AppendTestUtil.write(stm, 0, BLOCK_SIZE / 2);
stm.hflush();
if (hasSnapshot) {
SnapshotTestHelper.createSnapshot(fs, rootPath,
"st" + String.valueOf(stId));
++stId;
}
// Look into the block manager on the active node for the block
// under construction.
NameNode nn = cluster.getNameNode();
ExtendedBlock blk = DFSTestUtil.getFirstBlock(fs, fPath);
DatanodeDescriptor expectedPrimary =
DFSTestUtil.getExpectedPrimaryNode(nn, blk);
LOG.info("Expecting block recovery to be triggered on DN " +
expectedPrimary);
// Find the corresponding DN daemon, and spy on its connection to the
// active.
DataNode primaryDN = cluster.getDataNode(expectedPrimary.getIpcPort());
DatanodeProtocolClientSideTranslatorPB nnSpy = dnMap.get(primaryDN);
if (nnSpy == null) {
nnSpy = DataNodeTestUtils.spyOnBposToNN(primaryDN, nn);
dnMap.put(primaryDN, nnSpy);
}
// Delay the commitBlockSynchronization call
DelayAnswer delayer = new DelayAnswer(LOG);
Mockito.doAnswer(delayer).when(nnSpy).commitBlockSynchronization(
Mockito.eq(blk),
Mockito.anyInt(), // new genstamp
Mockito.anyLong(), // new length
Mockito.eq(true), // close file
Mockito.eq(false), // delete block
(DatanodeID[]) Mockito.anyObject(), // new targets
(String[]) Mockito.anyObject()); // new target storages
fs.recoverLease(fPath);
LOG.info("Waiting for commitBlockSynchronization call from primary");
delayer.waitForCall();
LOG.info("Deleting recursively " + grandestNonRootParent);
fs.delete(grandestNonRootParent, true);
delayer.proceed();
LOG.info("Now wait for result");
delayer.waitForResult();
Throwable t = delayer.getThrown();
if (t != null) {
LOG.info("Result exception (snapshot: " + hasSnapshot + "): " + t);
}
} // end of loop each fPath
LOG.info("Now check we can restart");
cluster.restartNameNodes();
LOG.info("Restart finished");
} finally {
if (stm != null) {
IOUtils.closeStream(stm);
}
if (cluster != null) {
cluster.shutdown();
}
}
}
@Test(timeout=600000)
public void testDeleteAndCommitBlockSynchonizationRaceNoSnapshot()
throws Exception {
testDeleteAndCommitBlockSynchronizationRace(false);
}
@Test(timeout=600000)
public void testDeleteAndCommitBlockSynchronizationRaceHasSnapshot()
throws Exception {
testDeleteAndCommitBlockSynchronizationRace(true);
}
}

34
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestPipelinesFailover.java
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@ -356,7 +356,8 @@ public void testFailoverRightBeforeCommitSynchronization() throws Exception {
NameNode nn0 = cluster.getNameNode(0);
ExtendedBlock blk = DFSTestUtil.getFirstBlock(fs, TEST_PATH);
DatanodeDescriptor expectedPrimary = getExpectedPrimaryNode(nn0, blk);
DatanodeDescriptor expectedPrimary =
DFSTestUtil.getExpectedPrimaryNode(nn0, blk);
LOG.info("Expecting block recovery to be triggered on DN " +
expectedPrimary);
@ -506,37 +507,6 @@ public String toString() {
}
}
/**
* @return the node which is expected to run the recovery of the
* given block, which is known to be under construction inside the
* given NameNOde.
*/
private DatanodeDescriptor getExpectedPrimaryNode(NameNode nn,
ExtendedBlock blk) {
BlockManager bm0 = nn.getNamesystem().getBlockManager();
BlockInfo storedBlock = bm0.getStoredBlock(blk.getLocalBlock());
assertTrue("Block " + blk + " should be under construction, " +
"got: " + storedBlock,
storedBlock instanceof BlockInfoUnderConstruction);
BlockInfoUnderConstruction ucBlock =
(BlockInfoUnderConstruction)storedBlock;
// We expect that the replica with the most recent heart beat will be
// the one to be in charge of the synchronization / recovery protocol.
final DatanodeStorageInfo[] storages = ucBlock.getExpectedStorageLocations();
DatanodeStorageInfo expectedPrimary = storages[0];
long mostRecentLastUpdate = expectedPrimary.getDatanodeDescriptor().getLastUpdate();
for (int i = 1; i < storages.length; i++) {
final long lastUpdate = storages[i].getDatanodeDescriptor().getLastUpdate();
if (lastUpdate > mostRecentLastUpdate) {
expectedPrimary = storages[i];
mostRecentLastUpdate = lastUpdate;
}
}
return expectedPrimary.getDatanodeDescriptor();
}
private DistributedFileSystem createFsAsOtherUser(
final MiniDFSCluster cluster, final Configuration conf)
throws IOException, InterruptedException {