/**
* 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.snapshot;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Array;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeData;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;
public class TestSnapshotStatsMXBean {
/**
* Test getting SnapshotStatsMXBean information
*/
@Test
public void testSnapshotStatsMXBeanInfo() throws Exception {
Configuration conf = new Configuration();
MiniDFSCluster cluster = null;
String pathName = "/snapshot";
Path path = new Path(pathName);
try {
cluster = new MiniDFSCluster.Builder(conf).build();
cluster.waitActive();
SnapshotManager sm = cluster.getNamesystem().getSnapshotManager();
DistributedFileSystem dfs = (DistributedFileSystem) cluster.getFileSystem();
dfs.mkdirs(path);
dfs.allowSnapshot(path);
dfs.createSnapshot(path);
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName mxbeanName = new ObjectName(
"Hadoop:service=NameNode,name=SnapshotInfo");
CompositeData[] directories =
(CompositeData[]) mbs.getAttribute(
mxbeanName, "SnapshottableDirectories");
int numDirectories = Array.getLength(directories);
assertEquals(sm.getNumSnapshottableDirs(), numDirectories);
CompositeData[] snapshots =
(CompositeData[]) mbs.getAttribute(mxbeanName, "Snapshots");
int numSnapshots = Array.getLength(snapshots);
assertEquals(sm.getNumSnapshots(), numSnapshots);
CompositeData d = (CompositeData) Array.get(directories, 0);
CompositeData s = (CompositeData) Array.get(snapshots, 0);
assertTrue(((String) d.get("path")).contains(pathName));
assertTrue(((String) s.get("snapshotDirectory")).contains(pathName));
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}