/*
* Copyright (C) 2015 hops.io.
*
* Licensed 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 io.hops.leaderElection;
import io.hops.exception.StorageException;
import io.hops.exception.StorageInitializtionException;
import io.hops.leaderElection.experiments.LightWeightNameNode;
import io.hops.metadata.LEStorageFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertTrue;
public class TestRelinquishRole {
private static final Log LOG = LogFactory.getLog(TestRelinquishRole.class);
List<LightWeightNameNode> nnList;
private final int DFS_LEADER_CHECK_INTERVAL_IN_MS = 3 * 1000;
private final int DFS_LEADER_MISSED_HB_THRESHOLD = 2;
private final String HTTP_ADDRESS = "dummy.address.com:9999";
private final String RPC_ADDRESS = "repc.server.ip:0000";
private final String DRIVER_JAR = "";
private final String DRIVER_CLASS = "io.hops.metadata.ndb.NdbStorageFactory";
private final String DFS_STORAGE_DRIVER_CONFIG_FILE = "ndb-config.properties";
private final long TIME_PERIOD_INCREMENT = 200;
@Before
public void init()
throws StorageInitializtionException, StorageException, IOException {
LogManager.getRootLogger().setLevel(Level.ALL);
nnList = new ArrayList<LightWeightNameNode>();
LEStorageFactory.setConfiguration(DRIVER_JAR, DRIVER_CLASS,
DFS_STORAGE_DRIVER_CONFIG_FILE);
LEStorageFactory.formatStorage();
VarsRegister.registerHdfsDefaultValues();
}
@After
public void tearDown() {
//stop all NN
LOG.debug("tearDown");
for (LightWeightNameNode nn : nnList) {
nn.stop();
}
}
/**
* Test leader election behavior under churn: start 10 NN then randomly stop,
* restart existing NN and start new ones. Check that there is always at most
* 1 leader and that the time without leader is never higher than expected.
*/
@Test
public void testRelinquishRole()
throws IOException, InterruptedException, CloneNotSupportedException {
LightWeightNameNode hdfs1 =
new LightWeightNameNode(new HdfsLeDescriptorFactory(),
DFS_LEADER_CHECK_INTERVAL_IN_MS, DFS_LEADER_MISSED_HB_THRESHOLD,
TIME_PERIOD_INCREMENT, HTTP_ADDRESS, RPC_ADDRESS);
nnList.add(hdfs1);
LightWeightNameNode hdfs2 =
new LightWeightNameNode(new HdfsLeDescriptorFactory(),
DFS_LEADER_CHECK_INTERVAL_IN_MS, DFS_LEADER_MISSED_HB_THRESHOLD,
TIME_PERIOD_INCREMENT, HTTP_ADDRESS, RPC_ADDRESS);
nnList.add(hdfs2);
hdfs1.getLeaderElectionInstance().waitActive();
hdfs2.getLeaderElectionInstance().waitActive();
long hdfs1Id = hdfs1.getLeCurrentId();
long hdfs2Id = hdfs2.getLeCurrentId();
assertTrue("Leader Check Failed ", hdfs1.isLeader() == true);
assertTrue("Leader Check Failed ", hdfs2.isLeader() == false);
// relinquish role
hdfs1.getLeaderElectionInstance().relinquishCurrentIdInNextRound();
assertTrue("Leader Check Failed ", hdfs1.isLeader() == false);
Thread.sleep(
DFS_LEADER_CHECK_INTERVAL_IN_MS * (DFS_LEADER_MISSED_HB_THRESHOLD + 1));
long hdfs1IdNew = hdfs1.getLeCurrentId();
long hdfs2IdNew = hdfs2.getLeCurrentId();
assertTrue("Leader Check Failed ", hdfs1.isLeader() == false);
assertTrue("Leader Check Failed ", hdfs2.isLeader() == true);
assertTrue("ID Check Failed ", hdfs1Id != hdfs1IdNew);
assertTrue("ID Check Failed ", hdfs2Id == hdfs2IdNew);
}
}