/**
* 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;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics;
/**
* This test ensures the all types of data node report work correctly.
*/
public class TestDatanodeReport extends TestCase {
final static private Configuration conf = new HdfsConfiguration();
final static private int NUM_OF_DATANODES = 4;
/**
* This test attempts to different types of datanode report.
*/
public void testDatanodeReport() throws Exception {
conf.setInt(
DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY, 500); // 0.5s
conf.setLong("dfs.heartbeat.interval", 1L);
MiniDFSCluster cluster =
new MiniDFSCluster(conf, NUM_OF_DATANODES, true, null);
try {
//wait until the cluster is up
cluster.waitActive();
InetSocketAddress addr = new InetSocketAddress("localhost",
cluster.getNameNodePort());
DFSClient client = new DFSClient(addr, conf);
assertEquals(client.datanodeReport(DatanodeReportType.ALL).length,
NUM_OF_DATANODES);
assertEquals(client.datanodeReport(DatanodeReportType.LIVE).length,
NUM_OF_DATANODES);
assertEquals(client.datanodeReport(DatanodeReportType.DEAD).length, 0);
// bring down one datanode
ArrayList<DataNode> datanodes = cluster.getDataNodes();
datanodes.remove(datanodes.size()-1).shutdown();
DatanodeInfo[] nodeInfo = client.datanodeReport(DatanodeReportType.DEAD);
while (nodeInfo.length != 1) {
try {
Thread.sleep(500);
} catch (Exception e) {
}
nodeInfo = client.datanodeReport(DatanodeReportType.DEAD);
}
assertEquals(client.datanodeReport(DatanodeReportType.LIVE).length,
NUM_OF_DATANODES-1);
assertEquals(client.datanodeReport(DatanodeReportType.ALL).length,
NUM_OF_DATANODES);
Thread.sleep(5000);
FSNamesystemMetrics fsMetrics =
cluster.getNamesystem().getFSNamesystemMetrics();
assertEquals(1,fsMetrics.numExpiredHeartbeats.getCurrentIntervalValue());
}finally {
cluster.shutdown();
}
}
public static void main(String[] args) throws Exception {
new TestDatanodeReport().testDatanodeReport();
}
}