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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.spark.launcher;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import org.junit.Test;
import static org.junit.Assert.*;
import static org.apache.spark.launcher.LauncherProtocol.*;
public class LauncherServerSuite extends BaseSuite {
@Test
public void testLauncherServerReuse() throws Exception {
ChildProcAppHandle handle1 = null;
ChildProcAppHandle handle2 = null;
ChildProcAppHandle handle3 = null;
try {
handle1 = LauncherServer.newAppHandle();
handle2 = LauncherServer.newAppHandle();
LauncherServer server1 = handle1.getServer();
assertSame(server1, handle2.getServer());
handle1.kill();
handle2.kill();
handle3 = LauncherServer.newAppHandle();
assertNotSame(server1, handle3.getServer());
handle3.kill();
assertNull(LauncherServer.getServerInstance());
} finally {
kill(handle1);
kill(handle2);
kill(handle3);
}
}
@Test
public void testCommunication() throws Exception {
ChildProcAppHandle handle = LauncherServer.newAppHandle();
TestClient client = null;
try {
Socket s = new Socket(InetAddress.getLoopbackAddress(),
LauncherServer.getServerInstance().getPort());
final Semaphore semaphore = new Semaphore(0);
handle.addListener(new SparkAppHandle.Listener() {
@Override
public void stateChanged(SparkAppHandle handle) {
semaphore.release();
}
@Override
public void infoChanged(SparkAppHandle handle) {
semaphore.release();
}
});
client = new TestClient(s);
client.send(new Hello(handle.getSecret(), "1.4.0"));
semaphore.tryAcquire(10, TimeUnit.MILLISECONDS);
// Make sure the server matched the client to the handle.
assertNotNull(handle.getConnection());
client.send(new SetAppId("app-id"));
semaphore.tryAcquire(10, TimeUnit.MILLISECONDS);
assertEquals("app-id", handle.getAppId());
client.send(new SetState(SparkAppHandle.State.RUNNING));
semaphore.tryAcquire(10, TimeUnit.MILLISECONDS);
assertEquals(SparkAppHandle.State.RUNNING, handle.getState());
handle.stop();
Message stopMsg = client.inbound.poll(10, TimeUnit.SECONDS);
assertTrue(stopMsg instanceof Stop);
} finally {
kill(handle);
close(client);
client.clientThread.join();
}
}
@Test
public void testTimeout() throws Exception {
ChildProcAppHandle handle = null;
TestClient client = null;
try {
// LauncherServer will immediately close the server-side socket when the timeout is set
// to 0.
SparkLauncher.setConfig(SparkLauncher.CHILD_CONNECTION_TIMEOUT, "0");
handle = LauncherServer.newAppHandle();
Socket s = new Socket(InetAddress.getLoopbackAddress(),
LauncherServer.getServerInstance().getPort());
client = new TestClient(s);
// Try a few times since the client-side socket may not reflect the server-side close
// immediately.
boolean helloSent = false;
int maxTries = 10;
for (int i = 0; i < maxTries; i++) {
try {
if (!helloSent) {
client.send(new Hello(handle.getSecret(), "1.4.0"));
helloSent = true;
} else {
client.send(new SetAppId("appId"));
}
fail("Expected exception caused by connection timeout.");
} catch (IllegalStateException | IOException e) {
// Expected.
break;
} catch (AssertionError e) {
if (i < maxTries - 1) {
Thread.sleep(100);
} else {
throw new AssertionError("Test failed after " + maxTries + " attempts.", e);
}
}
}
} finally {
SparkLauncher.launcherConfig.remove(SparkLauncher.CHILD_CONNECTION_TIMEOUT);
kill(handle);
close(client);
}
}
private void kill(SparkAppHandle handle) {
if (handle != null) {
handle.kill();
}
}
private void close(Closeable c) {
if (c != null) {
try {
c.close();
} catch (Exception e) {
// no-op.
}
}
}
private static class TestClient extends LauncherConnection {
final BlockingQueue<Message> inbound;
final Thread clientThread;
TestClient(Socket s) throws IOException {
super(s);
this.inbound = new LinkedBlockingQueue<Message>();
this.clientThread = new Thread(this);
clientThread.setName("TestClient");
clientThread.setDaemon(true);
clientThread.start();
}
@Override
protected void handle(Message msg) throws IOException {
inbound.offer(msg);
}
}
}
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