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HDFS-2978. The NameNode should expose name dir statuses via JMX. Contributed by Aaron T. Myers.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1293707 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-02-25 22:14:53 +00:00
parent d83672d71c
commit b57260f848
4 changed files with 85 additions and 1 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -230,6 +230,8 @@ Release 0.23.3 - UNRELEASED
NEW FEATURES
HDFS-2978. The NameNode should expose name dir statuses via JMX. (atm)
IMPROVEMENTS
OPTIMIZATIONS

26
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -141,6 +141,8 @@
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirType;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.common.UpgradeStatusReport;
import org.apache.hadoop.hdfs.server.common.Util;
@ -4497,6 +4499,30 @@ public String getBlockPoolId() {
return blockPoolId;
}
@Override // NameNodeMXBean
public String getNameDirStatuses() {
Map<String, Map<File, StorageDirType>> statusMap =
new HashMap<String, Map<File, StorageDirType>>();
Map<File, StorageDirType> activeDirs = new HashMap<File, StorageDirType>();
for (Iterator<StorageDirectory> it
= getFSImage().getStorage().dirIterator(); it.hasNext();) {
StorageDirectory st = it.next();
activeDirs.put(st.getRoot(), st.getStorageDirType());
}
statusMap.put("active", activeDirs);
List<Storage.StorageDirectory> removedStorageDirs
= getFSImage().getStorage().getRemovedStorageDirs();
Map<File, StorageDirType> failedDirs = new HashMap<File, StorageDirType>();
for (StorageDirectory st : removedStorageDirs) {
failedDirs.put(st.getRoot(), st.getStorageDirType());
}
statusMap.put("failed", failedDirs);
return JSON.toString(statusMap);
}
/** @return the block manager. */
public BlockManager getBlockManager() {
return blockManager;

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeMXBean.java
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@ -166,4 +166,12 @@ public interface NameNodeMXBean {
* @return the block pool id
*/
public String getBlockPoolId();
/**
* Get status information about the directories storing image and edits logs
* of the NN.
*
* @return the name dir status information, as a JSON string.
*/
public String getNameDirStatuses();
}

48
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
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@ -17,23 +17,33 @@
*/
package org.apache.hadoop.hdfs.server.namenode;
import static org.junit.Assert.*;
import java.io.File;
import java.lang.management.ManagementFactory;
import java.net.URI;
import java.util.Collection;
import java.util.Map;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.util.VersionInfo;
import org.junit.Test;
import org.mortbay.util.ajax.JSON;
import junit.framework.Assert;
/**
* Class for testing {@link NameNodeMXBean} implementation
*/
public class TestNameNodeMXBean {
@SuppressWarnings({ "unchecked", "deprecation" })
@Test
public void testNameNodeMXBeanInfo() throws Exception {
Configuration conf = new Configuration();
@ -88,8 +98,46 @@ public void testNameNodeMXBeanInfo() throws Exception {
String deadnodeinfo = (String) (mbs.getAttribute(mxbeanName,
"DeadNodes"));
Assert.assertEquals(fsn.getDeadNodes(), deadnodeinfo);
// get attribute NameDirStatuses
String nameDirStatuses = (String) (mbs.getAttribute(mxbeanName,
"NameDirStatuses"));
Assert.assertEquals(fsn.getNameDirStatuses(), nameDirStatuses);
Map<String, Map<String, String>> statusMap =
(Map<String, Map<String, String>>) JSON.parse(nameDirStatuses);
Collection<URI> nameDirUris = cluster.getNameDirs(0);
for (URI nameDirUri : nameDirUris) {
File nameDir = new File(nameDirUri);
System.out.println("Checking for the presence of " + nameDir +
" in active name dirs.");
assertTrue(statusMap.get("active").containsKey(nameDir.getAbsolutePath()));
}
assertEquals(2, statusMap.get("active").size());
assertEquals(0, statusMap.get("failed").size());
// This will cause the first dir to fail.
File failedNameDir = new File(nameDirUris.toArray(new URI[0])[0]);
assertEquals(0, FileUtil.chmod(failedNameDir.getAbsolutePath(), "000"));
cluster.getNameNodeRpc().rollEditLog();
nameDirStatuses = (String) (mbs.getAttribute(mxbeanName,
"NameDirStatuses"));
statusMap = (Map<String, Map<String, String>>) JSON.parse(nameDirStatuses);
for (URI nameDirUri : nameDirUris) {
File nameDir = new File(nameDirUri);
String expectedStatus =
nameDir.equals(failedNameDir) ? "failed" : "active";
System.out.println("Checking for the presence of " + nameDir +
" in " + expectedStatus + " name dirs.");
assertTrue(statusMap.get(expectedStatus).containsKey(
nameDir.getAbsolutePath()));
}
assertEquals(1, statusMap.get("active").size());
assertEquals(1, statusMap.get("failed").size());
} finally {
if (cluster != null) {
for (URI dir : cluster.getNameDirs(0)) {
FileUtil.chmod(new File(dir).toString(), "700");
}
cluster.shutdown();
}
}