/**
* 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.*;
import java.lang.management.ManagementFactory;
import java.util.Map;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;
import org.mortbay.util.ajax.JSON;
/**
* Class for testing {@link NameNodeMXBean} implementation
*/
public class TestFSNamesystemMBean {
@Test
public void test() 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=FSNamesystemState");
String snapshotStats = (String) (mbs.getAttribute(mxbeanName,
"SnapshotStats"));
@SuppressWarnings("unchecked")
Map<String, Object> stat = (Map<String, Object>) JSON
.parse(snapshotStats);
assertTrue(stat.containsKey("SnapshottableDirectories")
&& (Long) stat.get("SnapshottableDirectories") == fsn
.getNumSnapshottableDirs());
assertTrue(stat.containsKey("Snapshots")
&& (Long) stat.get("Snapshots") == fsn.getNumSnapshots());
Object pendingDeletionBlocks = mbs.getAttribute(mxbeanName,
"PendingDeletionBlocks");
assertNotNull(pendingDeletionBlocks);
assertTrue(pendingDeletionBlocks instanceof Long);
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}