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HDFS-2943. Expose last checkpoint time and transaction stats as JMX metrics. Contributed by Aaron T. Myers.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1243822 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-02-14 08:27:15 +00:00
parent 0515b3322f
commit a87328dfab
5 changed files with 109 additions and 14 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -221,6 +221,9 @@ Release 0.23.2 - UNRELEASED
NEW FEATURES
HDFS-2943. Expose last checkpoint time and transaction stats as JMX
metrics. (atm)
IMPROVEMENTS
HDFS-2931. Switch DataNode's BlockVolumeChoosingPolicy to private-audience.

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
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@ -711,7 +711,7 @@ private void loadFSImage(File curFile, MD5Hash expectedMd5,
long txId = loader.getLoadedImageTxId();
LOG.info("Loaded image for txid " + txId + " from " + curFile);
lastAppliedTxId = txId;
storage.setMostRecentCheckpointTxId(txId);
storage.setMostRecentCheckpointInfo(txId, curFile.lastModified());
}
/**
@ -728,7 +728,7 @@ void saveFSImage(SaveNamespaceContext context, StorageDirectory sd)
saver.save(newFile, compression);
MD5FileUtils.saveMD5File(dstFile, saver.getSavedDigest());
storage.setMostRecentCheckpointTxId(txid);
storage.setMostRecentCheckpointInfo(txid, Util.now());
}
/**
@ -1032,7 +1032,7 @@ synchronized void saveDigestAndRenameCheckpointImage(
// advertise it as such to other checkpointers
// from now on
if (txid > storage.getMostRecentCheckpointTxId()) {
storage.setMostRecentCheckpointTxId(txid);
storage.setMostRecentCheckpointInfo(txid, Util.now());
}
}

25
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -2681,6 +2681,31 @@ public int getExpiredHeartbeats() {
return datanodeStatistics.getExpiredHeartbeats();
}
@Metric({"TransactionsSinceLastCheckpoint",
"Number of transactions since last checkpoint"})
public long getTransactionsSinceLastCheckpoint() {
return getEditLog().getLastWrittenTxId() -
getFSImage().getStorage().getMostRecentCheckpointTxId();
}
@Metric({"TransactionsSinceLastLogRoll",
"Number of transactions since last edit log roll"})
public long getTransactionsSinceLastLogRoll() {
return (getEditLog().getLastWrittenTxId() -
getEditLog().getCurSegmentTxId()) + 1;
}
@Metric({"LastWrittenTransactionId", "Transaction ID written to the edit log"})
public long getLastWrittenTransactionId() {
return getEditLog().getLastWrittenTxId();
}
@Metric({"LastCheckpointTime",
"Time in milliseconds since the epoch of the last checkpoint"})
public long getLastCheckpointTime() {
return getFSImage().getStorage().getMostRecentCheckpointTime();
}
/** @see ClientProtocol#getStats() */
long[] getStats() {
final long[] stats = datanodeStatistics.getStats();

22
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNStorage.java
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@ -128,6 +128,11 @@ public boolean isOfType(StorageDirType type) {
*/
protected long mostRecentCheckpointTxId = HdfsConstants.INVALID_TXID;
/**
* Time of the last checkpoint, in milliseconds since the epoch.
*/
private long mostRecentCheckpointTime = 0;
/**
* list of failed (and thus removed) storages
*/
@ -440,19 +445,30 @@ void writeTransactionIdFile(StorageDirectory sd, long txid) throws IOException {
}
/**
* Set the transaction ID of the last checkpoint
* Set the transaction ID and time of the last checkpoint
*
* @param txid transaction id of the last checkpoint
* @param time time of the last checkpoint, in millis since the epoch
*/
void setMostRecentCheckpointTxId(long txid) {
void setMostRecentCheckpointInfo(long txid, long time) {
this.mostRecentCheckpointTxId = txid;
this.mostRecentCheckpointTime = time;
}
/**
* Return the transaction ID of the last checkpoint.
* @return the transaction ID of the last checkpoint.
*/
long getMostRecentCheckpointTxId() {
return mostRecentCheckpointTxId;
}
/**
* @return the time of the most recent checkpoint in millis since the epoch.
*/
long getMostRecentCheckpointTime() {
return mostRecentCheckpointTime;
}
/**
* Write a small file in all available storage directories that
* indicates that the namespace has reached some given transaction ID.

65
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
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@ -20,13 +20,12 @@
import static org.apache.hadoop.test.MetricsAsserts.assertCounter;
import static org.apache.hadoop.test.MetricsAsserts.assertGauge;
import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
import static org.junit.Assert.*;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Random;
import junit.framework.TestCase;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
@ -39,17 +38,21 @@
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.hadoop.test.MetricsAsserts;
import org.apache.log4j.Level;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test for metrics published by the Namenode
*/
public class TestNameNodeMetrics extends TestCase {
public class TestNameNodeMetrics {
private static final Configuration CONF = new HdfsConfiguration();
private static final int DFS_REPLICATION_INTERVAL = 1;
private static final Path TEST_ROOT_DIR_PATH =
@ -81,8 +84,8 @@ private static Path getTestPath(String fileName) {
return new Path(TEST_ROOT_DIR_PATH, fileName);
}
@Override
protected void setUp() throws Exception {
@Before
public void setUp() throws Exception {
cluster = new MiniDFSCluster.Builder(CONF).numDataNodes(DATANODE_COUNT).build();
cluster.waitActive();
namesystem = cluster.getNamesystem();
@ -90,8 +93,8 @@ protected void setUp() throws Exception {
fs = (DistributedFileSystem) cluster.getFileSystem();
}
@Override
protected void tearDown() throws Exception {
@After
public void tearDown() throws Exception {
cluster.shutdown();
}
@ -115,6 +118,7 @@ private void readFile(FileSystem fileSys,Path name) throws IOException {
}
/** Test metrics associated with addition of a file */
@Test
public void testFileAdd() throws Exception {
// Add files with 100 blocks
final Path file = getTestPath("testFileAdd");
@ -159,6 +163,7 @@ public void testFileAdd() throws Exception {
}
/** Corrupt a block and ensure metrics reflects it */
@Test
public void testCorruptBlock() throws Exception {
// Create a file with single block with two replicas
final Path file = getTestPath("testCorruptBlock");
@ -184,6 +189,7 @@ public void testCorruptBlock() throws Exception {
/** Create excess blocks by reducing the replication factor for
* for a file and ensure metrics reflects it
*/
@Test
public void testExcessBlocks() throws Exception {
Path file = getTestPath("testExcessBlocks");
createFile(file, 100, (short)2);
@ -196,6 +202,7 @@ public void testExcessBlocks() throws Exception {
}
/** Test to ensure metrics reflects missing blocks */
@Test
public void testMissingBlock() throws Exception {
// Create a file with single block with two replicas
Path file = getTestPath("testMissingBlocks");
@ -220,6 +227,7 @@ private void waitForDeletion() throws InterruptedException {
Thread.sleep(DFS_REPLICATION_INTERVAL * (DATANODE_COUNT + 1) * 1000);
}
@Test
public void testRenameMetrics() throws Exception {
Path src = getTestPath("src");
createFile(src, 100, (short)1);
@ -244,6 +252,7 @@ public void testRenameMetrics() throws Exception {
*
* @throws IOException in case of an error
*/
@Test
public void testGetBlockLocationMetric() throws Exception {
Path file1_Path = new Path(TEST_ROOT_DIR_PATH, "file1.dat");
@ -272,4 +281,46 @@ public void testGetBlockLocationMetric() throws Exception{
updateMetrics();
assertCounter("GetBlockLocations", 3L, getMetrics(NN_METRICS));
}
/**
* Test NN checkpoint and transaction-related metrics.
*/
@Test
public void testTransactionAndCheckpointMetrics() throws Exception {
long lastCkptTime = MetricsAsserts.getLongGauge("LastCheckpointTime",
getMetrics(NS_METRICS));
assertGauge("LastCheckpointTime", lastCkptTime, getMetrics(NS_METRICS));
assertGauge("LastWrittenTransactionId", 1L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastCheckpoint", 1L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastLogRoll", 1L, getMetrics(NS_METRICS));
fs.mkdirs(new Path(TEST_ROOT_DIR_PATH, "/tmp"));
updateMetrics();
assertGauge("LastCheckpointTime", lastCkptTime, getMetrics(NS_METRICS));
assertGauge("LastWrittenTransactionId", 2L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastCheckpoint", 2L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastLogRoll", 2L, getMetrics(NS_METRICS));
cluster.getNameNodeRpc().rollEditLog();
updateMetrics();
assertGauge("LastCheckpointTime", lastCkptTime, getMetrics(NS_METRICS));
assertGauge("LastWrittenTransactionId", 4L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastCheckpoint", 4L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastLogRoll", 1L, getMetrics(NS_METRICS));
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_ENTER);
cluster.getNameNodeRpc().saveNamespace();
cluster.getNameNodeRpc().setSafeMode(SafeModeAction.SAFEMODE_LEAVE);
updateMetrics();
long newLastCkptTime = MetricsAsserts.getLongGauge("LastCheckpointTime",
getMetrics(NS_METRICS));
assertTrue(lastCkptTime < newLastCkptTime);
assertGauge("LastWrittenTransactionId", 6L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastCheckpoint", 1L, getMetrics(NS_METRICS));
assertGauge("TransactionsSinceLastLogRoll", 1L, getMetrics(NS_METRICS));
}
}