/**
* 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;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.tools.DFSAdmin;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class TestRefreshCallQueue {
private MiniDFSCluster cluster;
private Configuration config;
private FileSystem fs;
static int mockQueueConstructions;
static int mockQueuePuts;
private static final int NNPort = 54222;
private static String CALLQUEUE_CONFIG_KEY = "ipc." + NNPort + ".callqueue.impl";
@Before
public void setUp() throws Exception {
// We want to count additional events, so we reset here
mockQueueConstructions = 0;
mockQueuePuts = 0;
config = new Configuration();
config.setClass(CALLQUEUE_CONFIG_KEY,
MockCallQueue.class, BlockingQueue.class);
config.set("hadoop.security.authorization", "true");
FileSystem.setDefaultUri(config, "hdfs://localhost:" + NNPort);
fs = FileSystem.get(config);
cluster = new MiniDFSCluster.Builder(config).nameNodePort(NNPort).build();
cluster.waitActive();
}
@After
public void tearDown() throws Exception {
if(cluster!=null) {
cluster.shutdown();
}
}
@SuppressWarnings("serial")
public static class MockCallQueue<E> extends LinkedBlockingQueue<E> {
public MockCallQueue(int cap, String ns, Configuration conf) {
super(cap);
mockQueueConstructions++;
}
public void put(E e) throws InterruptedException {
super.put(e);
mockQueuePuts++;
}
}
// Returns true if mock queue was used for put
public boolean canPutInMockQueue() throws IOException {
int putsBefore = mockQueuePuts;
fs.exists(new Path("/")); // Make an RPC call
return mockQueuePuts > putsBefore;
}
@Test
public void testRefresh() throws Exception {
assertTrue("Mock queue should have been constructed", mockQueueConstructions > 0);
assertTrue("Puts are routed through MockQueue", canPutInMockQueue());
int lastMockQueueConstructions = mockQueueConstructions;
// Replace queue with the queue specified in core-site.xml, which would be the LinkedBlockingQueue
DFSAdmin admin = new DFSAdmin(config);
String [] args = new String[]{"-refreshCallQueue"};
int exitCode = admin.run(args);
assertEquals("DFSAdmin should return 0", 0, exitCode);
assertEquals("Mock queue should have no additional constructions", lastMockQueueConstructions, mockQueueConstructions);
try {
assertFalse("Puts are routed through LBQ instead of MockQueue", canPutInMockQueue());
} catch (IOException ioe){
fail("Could not put into queue at all");
}
}
}