/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.namenode;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
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.util.VersionInfo;
import org.junit.Test;
import org.mortbay.util.ajax.JSON;
/**
* Class for testing {@link NameNodeMXBean} implementation
*/
public class TestNameNodeMXBean {
/**
* Used to assert equality between doubles
*/
private static final double DELTA = 0.000001;
@SuppressWarnings({ "unchecked", "deprecation" })
@Test
public void testNameNodeMXBeanInfo() throws Exception {
Configuration conf = new Configuration();
MiniDFSCluster cluster = null;
try {
cluster = new MiniDFSCluster.Builder(conf).build();
cluster.waitActive();
FSNamesystem fsn = cluster.getNameNode().namesystem;
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName mxbeanName = new ObjectName(
"Hadoop:service=NameNode,name=NameNodeInfo");
// get attribute "ClusterId"
String clusterId = (String) mbs.getAttribute(mxbeanName, "ClusterId");
assertEquals(fsn.getClusterId(), clusterId);
// get attribute "BlockPoolId"
String blockpoolId = (String) mbs.getAttribute(mxbeanName,
"BlockPoolId");
assertEquals(fsn.getBlockPoolId(), blockpoolId);
// get attribute "Version"
String version = (String) mbs.getAttribute(mxbeanName, "Version");
assertEquals(fsn.getVersion(), version);
assertTrue(version.equals(VersionInfo.getVersion()
+ ", r" + VersionInfo.getRevision()));
// get attribute "Used"
Long used = (Long) mbs.getAttribute(mxbeanName, "Used");
assertEquals(fsn.getUsed(), used.longValue());
// get attribute "Total"
Long total = (Long) mbs.getAttribute(mxbeanName, "Total");
assertEquals(fsn.getTotal(), total.longValue());
// get attribute "safemode"
String safemode = (String) mbs.getAttribute(mxbeanName, "Safemode");
assertEquals(fsn.getSafemode(), safemode);
// get attribute nondfs
Long nondfs = (Long) (mbs.getAttribute(mxbeanName, "NonDfsUsedSpace"));
assertEquals(fsn.getNonDfsUsedSpace(), nondfs.longValue());
// get attribute percentremaining
Float percentremaining = (Float) (mbs.getAttribute(mxbeanName,
"PercentRemaining"));
assertEquals(fsn.getPercentRemaining(), percentremaining
.floatValue(), DELTA);
// get attribute Totalblocks
Long totalblocks = (Long) (mbs.getAttribute(mxbeanName, "TotalBlocks"));
assertEquals(fsn.getTotalBlocks(), totalblocks.longValue());
// get attribute alivenodeinfo
String alivenodeinfo = (String) (mbs.getAttribute(mxbeanName,
"LiveNodes"));
Map<String, Map<String, Object>> liveNodes =
(Map<String, Map<String, Object>>) JSON.parse(alivenodeinfo);
assertTrue(liveNodes.size() > 0);
for (Map<String, Object> liveNode : liveNodes.values()) {
assertTrue(liveNode.containsKey("nonDfsUsedSpace"));
assertTrue(((Long)liveNode.get("nonDfsUsedSpace")) > 0);
assertTrue(liveNode.containsKey("capacity"));
assertTrue(((Long)liveNode.get("capacity")) > 0);
assertTrue(liveNode.containsKey("numBlocks"));
assertTrue(((Long)liveNode.get("numBlocks")) == 0);
}
assertEquals(fsn.getLiveNodes(), alivenodeinfo);
// get attribute deadnodeinfo
String deadnodeinfo = (String) (mbs.getAttribute(mxbeanName,
"DeadNodes"));
assertEquals(fsn.getDeadNodes(), deadnodeinfo);
// get attribute JournalTransactionInfo
String journalTxnInfo = (String) mbs.getAttribute(mxbeanName,
"JournalTransactionInfo");
assertEquals("Bad value for NameTxnIds", fsn.getJournalTransactionInfo(),
journalTxnInfo);
// get attribute NameDirStatuses
String nameDirStatuses = (String) (mbs.getAttribute(mxbeanName,
"NameDirStatuses"));
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(
new File(failedNameDir, "current").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(new File(dir), "current").getAbsolutePath(), "755");
}
cluster.shutdown();
}
}
}
}