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/**
* 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.hbase.executor;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.anyObject;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import java.io.IOException;
import java.io.StringWriter;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.Waiter;
import org.apache.hadoop.hbase.Waiter.Predicate;
import org.apache.hadoop.hbase.executor.ExecutorService.Executor;
import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorConfig;
import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorStatus;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.Assert;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Category({MiscTests.class, SmallTests.class})
public class TestExecutorService {
@ClassRule
public static final HBaseClassTestRule CLASS_RULE =
HBaseClassTestRule.forClass(TestExecutorService.class);
private static final Logger LOG = LoggerFactory.getLogger(TestExecutorService.class);
@Test
public void testExecutorService() throws Exception {
int maxThreads = 5;
int maxTries = 10;
int sleepInterval = 10;
Server mockedServer = mock(Server.class);
when(mockedServer.getConfiguration()).thenReturn(HBaseConfiguration.create());
// Start an executor service pool with max 5 threads
ExecutorService executorService = new ExecutorService("unit_test");
executorService.startExecutorService(executorService.new ExecutorConfig().setExecutorType(
ExecutorType.MASTER_SERVER_OPERATIONS).setCorePoolSize(maxThreads));
Executor executor =
executorService.getExecutor(ExecutorType.MASTER_SERVER_OPERATIONS);
ThreadPoolExecutor pool = executor.threadPoolExecutor;
// Assert no threads yet
assertEquals(0, pool.getPoolSize());
AtomicBoolean lock = new AtomicBoolean(true);
AtomicInteger counter = new AtomicInteger(0);
// Submit maxThreads executors.
for (int i = 0; i < maxThreads; i++) {
executorService.submit(
new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN,
lock, counter));
}
// The TestEventHandler will increment counter when it starts.
int tries = 0;
while (counter.get() < maxThreads && tries < maxTries) {
LOG.info("Waiting for all event handlers to start...");
Thread.sleep(sleepInterval);
tries++;
}
// Assert that pool is at max threads.
assertEquals(maxThreads, counter.get());
assertEquals(maxThreads, pool.getPoolSize());
ExecutorStatus status = executor.getStatus();
assertTrue(status.queuedEvents.isEmpty());
assertEquals(5, status.running.size());
checkStatusDump(status);
// Now interrupt the running Executor
synchronized (lock) {
lock.set(false);
lock.notifyAll();
}
// Executor increments counter again on way out so.... test that happened.
while (counter.get() < (maxThreads * 2) && tries < maxTries) {
System.out.println("Waiting for all event handlers to finish...");
Thread.sleep(sleepInterval);
tries++;
}
assertEquals(maxThreads * 2, counter.get());
assertEquals(maxThreads, pool.getPoolSize());
// Add more than the number of threads items.
// Make sure we don't get RejectedExecutionException.
for (int i = 0; i < (2 * maxThreads); i++) {
executorService.submit(
new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN,
lock, counter));
}
// Now interrupt the running Executor
synchronized (lock) {
lock.set(false);
lock.notifyAll();
}
// Make sure threads are still around even after their timetolive expires.
Thread.sleep(ExecutorConfig.KEEP_ALIVE_TIME_MILLIS_DEFAULT * 2);
assertEquals(maxThreads, pool.getPoolSize());
executorService.shutdown();
assertEquals(0, executorService.getAllExecutorStatuses().size());
// Test that submit doesn't throw NPEs
executorService.submit(
new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN,
lock, counter));
}
private void checkStatusDump(ExecutorStatus status) throws IOException {
StringWriter sw = new StringWriter();
status.dumpTo(sw, "");
String dump = sw.toString();
LOG.info("Got status dump:\n" + dump);
assertTrue(dump.contains("Waiting on java.util.concurrent.atomic.AtomicBoolean"));
}
public static class TestEventHandler extends EventHandler {
private final AtomicBoolean lock;
private AtomicInteger counter;
public TestEventHandler(Server server, EventType eventType, AtomicBoolean lock,
AtomicInteger counter) {
super(server, eventType);
this.lock = lock;
this.counter = counter;
}
@Override
public void process() throws IOException {
int num = counter.incrementAndGet();
LOG.info("Running process #" + num + ", threadName=" +
Thread.currentThread().getName());
synchronized (lock) {
while (lock.get()) {
try {
lock.wait();
} catch (InterruptedException e) {
// do nothing
}
}
}
counter.incrementAndGet();
}
}
@Test
public void testAborting() throws Exception {
final Configuration conf = HBaseConfiguration.create();
final Server server = mock(Server.class);
when(server.getConfiguration()).thenReturn(conf);
ExecutorService executorService = new ExecutorService("unit_test");
executorService.startExecutorService(executorService.new ExecutorConfig().setExecutorType(
ExecutorType.MASTER_SERVER_OPERATIONS).setCorePoolSize(1));
executorService.submit(new EventHandler(server, EventType.M_SERVER_SHUTDOWN) {
@Override
public void process() throws IOException {
throw new RuntimeException("Should cause abort");
}
});
Waiter.waitFor(conf, 30000, new Predicate<Exception>() {
@Override
public boolean evaluate() throws Exception {
try {
verify(server, times(1)).abort(anyString(), (Throwable) anyObject());
return true;
} catch (Throwable t) {
return false;
}
}
});
executorService.shutdown();
}
@Test
public void testSnapshotHandlers() throws Exception {
final Configuration conf = HBaseConfiguration.create();
final Server server = mock(Server.class);
when(server.getConfiguration()).thenReturn(conf);
ExecutorService executorService = new ExecutorService("testSnapshotHandlers");
executorService.startExecutorService(executorService.new ExecutorConfig().setExecutorType(
ExecutorType.MASTER_SNAPSHOT_OPERATIONS).setCorePoolSize(1));
CountDownLatch latch = new CountDownLatch(1);
CountDownLatch waitForEventToStart = new CountDownLatch(1);
executorService.submit(new EventHandler(server, EventType.C_M_SNAPSHOT_TABLE) {
@Override
public void process() throws IOException {
waitForEventToStart.countDown();
try {
latch.await();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
});
//Wait EventHandler to start
waitForEventToStart.await(10, TimeUnit.SECONDS);
int activeCount = executorService.getExecutor(ExecutorType.MASTER_SNAPSHOT_OPERATIONS)
.getThreadPoolExecutor().getActiveCount();
Assert.assertEquals(1, activeCount);
latch.countDown();
Waiter.waitFor(conf, 3000, () -> {
int count = executorService.getExecutor(ExecutorType.MASTER_SNAPSHOT_OPERATIONS)
.getThreadPoolExecutor().getActiveCount();
return count == 0;
});
}
}