org.apache.hadoop.hdfs.server.namenode.TestFSNamesystemMBean.java Source code

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Here is the source code for org.apache.hadoop.hdfs.server.namenode.TestFSNamesystemMBean.java

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/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;

import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import static org.junit.Assert.*;

/**
 * Class for testing {@link NameNodeMXBean} implementation
 */
public class TestFSNamesystemMBean {

    public static final Log LOG = LogFactory.getLog(TestFSNamesystemMBean.class);

    /**
     * MBeanClient tries to access FSNamesystem/FSNamesystemState/NameNodeInfo
     * JMX properties. If it can access all the properties, the test is
     * considered successful.
     */
    private static class MBeanClient extends Thread {
        private boolean succeeded = false;

        @Override
        public void run() {
            try {
                MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
                // Metrics that belong to "FSNamesystem", these are metrics that
                // come from hadoop metrics framework for the class FSNamesystem.
                ObjectName mxbeanNamefsn = new ObjectName("Hadoop:service=NameNode,name=FSNamesystem");

                // Metrics that belong to "FSNamesystemState".
                // These are metrics that FSNamesystem registers directly with MBeanServer.
                ObjectName mxbeanNameFsns = new ObjectName("Hadoop:service=NameNode,name=FSNamesystemState");

                // Metrics that belong to "NameNodeInfo".
                // These are metrics that FSNamesystem registers directly with MBeanServer.
                ObjectName mxbeanNameNni = new ObjectName("Hadoop:service=NameNode,name=NameNodeInfo");

                final Set<ObjectName> mbeans = new HashSet<ObjectName>();
                mbeans.add(mxbeanNamefsn);
                mbeans.add(mxbeanNameFsns);
                mbeans.add(mxbeanNameNni);

                for (ObjectName mbean : mbeans) {
                    MBeanInfo attributes = mbs.getMBeanInfo(mbean);
                    for (MBeanAttributeInfo attributeInfo : attributes.getAttributes()) {
                        mbs.getAttribute(mbean, attributeInfo.getName());
                    }
                }

                succeeded = true;
            } catch (Exception e) {
                LOG.error(e, e);
            }
        }
    }

    @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");

            Object pendingDeletionBlocks = mbs.getAttribute(mxbeanName, "PendingDeletionBlocks");
            assertNotNull(pendingDeletionBlocks);
            assertTrue(pendingDeletionBlocks instanceof Long);
        } finally {
            if (cluster != null) {
                cluster.shutdown();
            }
        }
    }

    // The test makes sure JMX request can be processed even if namesystem's
    // writeLock is owned by another thread.
    @Test
    public void testWithFSNamesystemWriteLock() throws Exception {
        Configuration conf = new Configuration();
        MiniDFSCluster cluster = null;
        FSNamesystem fsn = null;
        try {
            cluster = new MiniDFSCluster.Builder(conf).build();
            cluster.waitActive();
            fsn = cluster.getNameNode().namesystem;
            MBeanClient client = new MBeanClient();
            client.start();
            client.join(20000);
            assertTrue("JMX calls are blocked when FSNamesystem's writerlock" + "is owned by another thread",
                    client.succeeded);
            client.interrupt();
        } finally {
            if (cluster != null) {
                cluster.shutdown();
            }
        }
    }
}