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HDFS-2285. BackupNode should reject requests to modify namespace. Contributed by Konstantin Shvachko and Uma Maheswara Rao G.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1195013 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Konstantin Shvachko 2011-10-29 20:11:35 +00:00
parent 2eca60199a
commit 64c019cccc
6 changed files with 53 additions and 7 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1816,6 +1816,9 @@ Release 0.22.0 - Unreleased
HDFS-2452. OutOfMemoryError in DataXceiverServer takes down the DataNode
(Uma Maheswara Rao via cos)
HDFS-2285. BackupNode should reject requests to modify namespace.
(shv and Uma Maheswara Rao)
Release 0.21.1 - Unreleased
HDFS-1466. TestFcHdfsSymlink relies on /tmp/test not existing. (eli)

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupNode.java
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@ -28,6 +28,7 @@
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocolR23Compatible.JournalProtocolServerSideTranslatorR23;
import org.apache.hadoop.hdfs.protocolR23Compatible.JournalWireProtocol;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
@ -137,6 +138,10 @@ protected void initialize(Configuration conf) throws IOException {
CommonConfigurationKeys.FS_TRASH_INTERVAL_DEFAULT);
NamespaceInfo nsInfo = handshake(conf);
super.initialize(conf);
if (false == namesystem.isInSafeMode()) {
namesystem.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
}
// Backup node should never do lease recovery,
// therefore lease hard limit should never expire.
namesystem.leaseManager.setLeasePeriod(
@ -191,6 +196,11 @@ public void stop() {
super.stop();
}
/* @Override */// NameNode
public boolean setSafeMode(SafeModeAction action) throws IOException {
throw new UnsupportedActionException("setSafeMode");
}
static class BackupNodeRpcServer extends NameNodeRpcServer implements
JournalProtocol {
private final String nnRpcAddress;

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/Checkpointer.java
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@ -243,6 +243,10 @@ void doCheckpoint() throws IOException {
}
long txid = bnImage.getLastAppliedTxId();
backupNode.namesystem.dir.setReady();
backupNode.namesystem.setBlockTotal();
bnImage.saveFSImageInAllDirs(backupNode.getNamesystem(), txid);
bnStorage.writeAll();

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -159,6 +159,11 @@ private BlockManager getBlockManager() {
*/
void imageLoadComplete() {
Preconditions.checkState(!ready, "FSDirectory already loaded");
setReady();
}
void setReady() {
if(ready) return;
writeLock();
try {
setReady(true);

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -3344,7 +3344,7 @@ public void decrementSafeBlockCount(Block b) {
/**
* Set the total number of blocks in the system.
*/
private void setBlockTotal() {
void setBlockTotal() {
// safeMode is volatile, and may be set to null at any time
SafeModeInfo safeMode = this.safeMode;
if (safeMode == null)

32
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBackupNode.java
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@ -19,9 +19,12 @@
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.List;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Log4JLogger;
@ -29,13 +32,13 @@
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.log4j.Level;
@ -44,8 +47,6 @@
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import junit.framework.TestCase;
public class TestBackupNode extends TestCase {
public static final Log LOG = LogFactory.getLog(TestBackupNode.class);
@ -241,8 +242,11 @@ public void testBackupNode() throws Exception {
void testCheckpoint(StartupOption op) throws Exception {
Path file1 = new Path("checkpoint.dat");
Path file2 = new Path("checkpoint2.dat");
Path file3 = new Path("backup.dat");
Configuration conf = new HdfsConfiguration();
short replication = (short)conf.getInt("dfs.replication", 3);
int numDatanodes = Math.max(3, replication);
conf.set(DFSConfigKeys.DFS_BLOCKREPORT_INITIAL_DELAY_KEY, "0");
conf.setInt(DFSConfigKeys.DFS_DATANODE_SCAN_PERIOD_HOURS_KEY, -1); // disable block scanner
conf.setInt(DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 1);
@ -290,7 +294,7 @@ void testCheckpoint(StartupOption op) throws Exception {
//
// Restart cluster and verify that file1 still exist.
//
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0)
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes)
.format(false).build();
fileSys = cluster.getFileSystem();
// check that file1 still exists
@ -319,6 +323,26 @@ void testCheckpoint(StartupOption op) throws Exception {
backup.doCheckpoint();
waitCheckpointDone(cluster, backup, txid);
// Try BackupNode operations
InetSocketAddress add = backup.getNameNodeAddress();
// Write to BN
FileSystem bnFS = FileSystem.get(new Path("hdfs://"
+ NameNode.getHostPortString(add)).toUri(), conf);
boolean canWrite = true;
try {
TestCheckpoint.writeFile(bnFS, file3, replication);
} catch (IOException eio) {
LOG.info("Write to BN failed as expected: ", eio);
canWrite = false;
}
assertFalse("Write to BackupNode must be prohibited.", canWrite);
TestCheckpoint.writeFile(fileSys, file3, replication);
TestCheckpoint.checkFile(fileSys, file3, replication);
// should also be on BN right away
assertTrue("file3 does not exist on BackupNode",
op != StartupOption.BACKUP || bnFS.exists(file3));
} catch(IOException e) {
LOG.error("Error in TestBackupNode:", e);
assertTrue(e.getLocalizedMessage(), false);