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HDFS-9229. Expose size of NameNode directory as a metric. Contributed by Surendra Singh Lilhore.

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Change-Id: I985627a5d1400249d72d084283ef366d5ac6e07b
This commit is contained in:
Zhe Zhang 2015-10-29 11:14:00 -07:00
parent cf953b6258
commit 8def51a708
9 changed files with 122 additions and 2 deletions
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1
hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
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@ -240,6 +240,7 @@ Each metrics record contains tags such as HAState and Hostname as additional inf
| `LockQueueLength` | Number of threads waiting to acquire FSNameSystem lock |
| `TotalSyncCount` | Total number of sync operations performed by edit log |
| `TotalSyncTimes` | Total number of milliseconds spent by various edit logs in sync operation|
| `NameDirSize` | NameNode name directories size in bytes |
JournalNode
-----------

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1608,6 +1608,9 @@ Release 2.8.0 - UNRELEASED
HDFS-8545. Refactor FS#getUsed() to use ContentSummary and add an API to fetch
the total file length from a specific path (J.Andreina via vinayakumarb)
HDFS-9229. Expose size of NameNode directory as a metric.
(Surendra Singh Lilhore via zhz)
OPTIMIZATIONS
HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Storage.java
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@ -30,6 +30,7 @@
import java.util.List;
import java.util.Properties;
import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
@ -310,6 +311,20 @@ public StorageDirType getStorageDirType() {
return dirType;
}
/**
* Get storage directory size.
*/
public long getDirecorySize() {
try {
if (!isShared() && root != null && root.exists()) {
return FileUtils.sizeOfDirectory(root);
}
} catch (Exception e) {
LOG.warn("Failed to get directory size :" + root, e);
}
return 0;
}
public void read(File from, Storage storage) throws IOException {
Properties props = readPropertiesFile(from);
storage.setFieldsFromProperties(props, this);

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
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@ -1064,6 +1064,8 @@ public synchronized void saveNamespace(FSNamesystem source, NameNodeFile nnf,
} finally {
removeFromCheckpointing(imageTxId);
}
//Update NameDirSize Metric
getStorage().updateNameDirSize();
}
/**
@ -1244,6 +1246,8 @@ CheckpointSignature rollEditLog(int layoutVersion) throws IOException {
// we won't miss this log segment on a restart if the edits directories
// go missing.
storage.writeTransactionIdFileToStorage(getEditLog().getCurSegmentTxId());
//Update NameDirSize Metric
getStorage().updateNameDirSize();
return new CheckpointSignature(this);
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -6402,6 +6402,11 @@ public String getSoftwareVersion() {
return VersionInfo.getVersion();
}
@Override // NameNodeStatusMXBean
public String getNameDirSize() {
return getFSImage().getStorage().getNNDirectorySize();
}
/**
* Verifies that the given identifier and password are valid and match.
* @param identifier Token identifier.

25
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNStorage.java
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@ -29,6 +29,7 @@
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.UUID;
import java.util.concurrent.CopyOnWriteArrayList;
@ -52,6 +53,7 @@
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.net.DNS;
import org.apache.hadoop.util.Time;
import org.mortbay.util.ajax.JSON;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
@ -148,6 +150,11 @@ public boolean isOfType(StorageDirType type) {
*/
private HashMap<String, String> deprecatedProperties;
/**
* Name directories size for metric.
*/
private Map<String, Long> nameDirSizeMap = new HashMap<>();
/**
* Construct the NNStorage.
* @param conf Namenode configuration.
@ -166,6 +173,8 @@ public NNStorage(Configuration conf,
setStorageDirectories(imageDirs,
Lists.newArrayList(editsDirs),
FSNamesystem.getSharedEditsDirs(conf));
//Update NameDirSize metric value after NN start
updateNameDirSize();
}
@Override // Storage
@ -1075,4 +1084,20 @@ public NamespaceInfo getNamespaceInfo() {
getBlockPoolID(),
getCTime());
}
public String getNNDirectorySize() {
return JSON.toString(nameDirSizeMap);
}
public void updateNameDirSize() {
Map<String, Long> nnDirSizeMap = new HashMap<>();
for (Iterator<StorageDirectory> it = dirIterator(); it.hasNext();) {
StorageDirectory sd = it.next();
if (!sd.isShared()) {
nnDirSizeMap.put(sd.getRoot().getAbsolutePath(), sd.getDirecorySize());
}
}
nameDirSizeMap.clear();
nameDirSizeMap.putAll(nnDirSizeMap);
}
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeMXBean.java
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@ -272,4 +272,9 @@ public interface NameNodeMXBean {
*/
public Map<String, Integer> getDistinctVersions();
/**
* Get namenode directory size.
*/
String getNameDirSize();
}

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/EditLogTailer.java
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@ -372,6 +372,8 @@ private void doWork() {
} finally {
namesystem.cpUnlock();
}
//Update NameDirSize Metric
namesystem.getFSImage().getStorage().updateNameDirSize();
} catch (EditLogInputException elie) {
LOG.warn("Error while reading edits from disk. Will try again.", elie);
} catch (InterruptedException ie) {

60
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
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@ -26,12 +26,16 @@
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
import org.apache.hadoop.hdfs.server.namenode.top.TopConf;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.io.nativeio.NativeIO.POSIX.NoMlockCacheManipulator;
import org.apache.hadoop.net.ServerSocketUtil;
import org.apache.hadoop.util.VersionInfo;
import org.codehaus.jackson.map.ObjectMapper;
import org.junit.Test;
@ -40,6 +44,7 @@
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.io.File;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.net.URI;
import java.util.Collection;
@ -412,4 +417,59 @@ public void testQueueLength() throws Exception {
}
}
}
@Test(timeout = 120000)
public void testNNDirectorySize() throws Exception{
Configuration conf = new Configuration();
conf.setInt(DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
// Have to specify IPC ports so the NNs can talk to each other.
MiniDFSNNTopology topology = new MiniDFSNNTopology()
.addNameservice(new MiniDFSNNTopology.NSConf("ns1")
.addNN(new MiniDFSNNTopology.NNConf("nn1")
.setIpcPort(ServerSocketUtil.getPort(0, 100)))
.addNN(new MiniDFSNNTopology.NNConf("nn2")
.setIpcPort(ServerSocketUtil.getPort(0, 100))));
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(topology).numDataNodes(0)
.build();
FileSystem fs = null;
try {
cluster.waitActive();
FSNamesystem nn0 = cluster.getNamesystem(0);
FSNamesystem nn1 = cluster.getNamesystem(1);
checkNNDirSize(cluster.getNameDirs(0), nn0.getNameDirSize());
checkNNDirSize(cluster.getNameDirs(1), nn1.getNameDirSize());
cluster.transitionToActive(0);
fs = cluster.getFileSystem(0);
DFSTestUtil.createFile(fs, new Path("/file"), 0, (short) 1, 0L);
//rollEditLog
HATestUtil.waitForStandbyToCatchUp(cluster.getNameNode(0),
cluster.getNameNode(1));
checkNNDirSize(cluster.getNameDirs(0), nn0.getNameDirSize());
checkNNDirSize(cluster.getNameDirs(1), nn1.getNameDirSize());
//Test metric after call saveNamespace
DFSTestUtil.createFile(fs, new Path("/file"), 0, (short) 1, 0L);
nn0.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
nn0.saveNamespace(0, 0);
checkNNDirSize(cluster.getNameDirs(0), nn0.getNameDirSize());
} finally {
cluster.shutdown();
}
}
@SuppressWarnings("unchecked")
private void checkNNDirSize(Collection<URI> nameDirUris, String metric){
Map<String, Long> nnDirMap =
(Map<String, Long>) JSON.parse(metric);
assertEquals(nameDirUris.size(), nnDirMap.size());
for (URI dirUrl : nameDirUris) {
File dir = new File(dirUrl);
assertEquals(nnDirMap.get(dir.getAbsolutePath()).longValue(),
FileUtils.sizeOfDirectory(dir));
}
}
}