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

Introduction

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

Source

/**
 * 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 java.io.IOException;
import java.util.concurrent.TimeoutException;

import junit.framework.Assert;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.junit.After;
import org.junit.Test;

/**
 * Test to ensure requests from dead datnodes are rejected by namenode with
 * appropriate exceptions/failure response
 */
public class TestDeadDatanode {
    private static final Log LOG = LogFactory.getLog(TestDeadDatanode.class);
    private MiniDFSCluster cluster;

    @After
    public void cleanup() {
        cluster.shutdown();
    }

    /**
     * wait for datanode to reach alive or dead state for waitTime given in
     * milliseconds.
     */
    private void waitForDatanodeState(DatanodeID nodeID, boolean alive, int waitTime)
            throws TimeoutException, InterruptedException, IOException {
        long stopTime = System.currentTimeMillis() + waitTime;
        FSNamesystem namesystem = cluster.getNameNode().getNamesystem();
        String state = alive ? "alive" : "dead";
        while (System.currentTimeMillis() < stopTime) {
            if (namesystem.getDatanode(nodeID).isAlive == alive) {
                LOG.info("datanode " + nodeID + " is " + state);
                return;
            }
            LOG.info("Waiting for datanode " + nodeID + " to become " + state);
            Thread.sleep(1000);
        }
        throw new TimeoutException("Timedout waiting for datanode reach state " + state);
    }

    /**
     * Test to ensure namenode rejects request from dead datanode
     * - Start a cluster
     * - Shutdown the datanode and wait for it to be marked dead at the namenode
     * - Send datanode requests to Namenode and make sure it is rejected 
     *   appropriately.
     */
    @Test
    public void testDeadDatanode() throws Exception {
        Configuration conf = new Configuration();
        conf.setInt("heartbeat.recheck.interval", 500);
        conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1L);
        cluster = new MiniDFSCluster(conf, 1, true, null);
        cluster.waitActive();

        // wait for datanode to be marked live
        DataNode dn = cluster.getDataNodes().get(0);
        DatanodeRegistration reg = cluster.getDataNodes().get(0).dnRegistration;
        waitForDatanodeState(reg, true, 20000);

        // Shutdown and wait for datanode to be marked dead
        dn.shutdown();
        waitForDatanodeState(reg, false, 20000);

        DatanodeProtocol dnp = cluster.getNameNode();
        Block block = new Block(0);
        Block[] blocks = new Block[] { block };
        String[] delHints = new String[] { "" };

        // Ensure blockReceived call from dead datanode is rejected with IOException
        try {
            dnp.blockReceived(reg, blocks, delHints);
            Assert.fail("Expected IOException is not thrown");
        } catch (IOException ex) {
            // Expected
        }

        // Ensure blockReport from dead datanode is rejected with IOException
        long[] blockReport = new long[] { 0L, 0L, 0L };
        try {
            dnp.blockReport(reg, blockReport);
            Assert.fail("Expected IOException is not thrown");
        } catch (IOException ex) {
            // Expected
        }

        // Ensure heartbeat from dead datanode is rejected with a command
        // that asks datanode to register again
        DatanodeCommand[] cmd = dnp.sendHeartbeat(reg, 0, 0, 0, 0, 0);
        Assert.assertEquals(1, cmd.length);
        Assert.assertEquals(cmd[0].getAction(), DatanodeCommand.REGISTER.getAction());
    }
}