/**
*
* 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.ipc;
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.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.ipc.protobuf.generated.TestDelayedRpcProtos;
import org.apache.hadoop.hbase.ipc.protobuf.generated.TestDelayedRpcProtos.TestArg;
import org.apache.hadoop.hbase.ipc.protobuf.generated.TestDelayedRpcProtos.TestResponse;
import org.apache.hadoop.hbase.security.User;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import com.google.common.collect.Lists;
import com.google.protobuf.BlockingRpcChannel;
import com.google.protobuf.BlockingService;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
/**
* Test that delayed RPCs work. Fire up three calls, the first of which should
* be delayed. Check that the last two, which are undelayed, return before the
* first one.
*/
@Category(MediumTests.class) // Fails sometimes with small tests
public class TestDelayedRpc {
private static final Log LOG = LogFactory.getLog(TestDelayedRpc.class);
public static RpcServerInterface rpcServer;
public static final int UNDELAYED = 0;
public static final int DELAYED = 1;
private static final int RPC_CLIENT_TIMEOUT = 30000;
@Test (timeout=60000)
public void testDelayedRpcImmediateReturnValue() throws Exception {
testDelayedRpc(false);
}
@Test (timeout=60000)
public void testDelayedRpcDelayedReturnValue() throws Exception {
testDelayedRpc(true);
}
private void testDelayedRpc(boolean delayReturnValue) throws Exception {
LOG.info("Running testDelayedRpc delayReturnValue=" + delayReturnValue);
Configuration conf = HBaseConfiguration.create();
InetSocketAddress isa = new InetSocketAddress("localhost", 0);
TestDelayedImplementation instance = new TestDelayedImplementation(delayReturnValue);
BlockingService service =
TestDelayedRpcProtos.TestDelayedService.newReflectiveBlockingService(instance);
rpcServer = new RpcServer(null, "testDelayedRpc",
Lists.newArrayList(new RpcServer.BlockingServiceAndInterface(service, null)),
isa,
conf,
new FifoRpcScheduler(conf, 1));
rpcServer.start();
RpcClient rpcClient = RpcClientFactory.createClient(
conf, HConstants.DEFAULT_CLUSTER_ID.toString());
try {
BlockingRpcChannel channel = rpcClient.createBlockingRpcChannel(
ServerName.valueOf(rpcServer.getListenerAddress().getHostName(),
rpcServer.getListenerAddress().getPort(), System.currentTimeMillis()),
User.getCurrent(), RPC_CLIENT_TIMEOUT);
TestDelayedRpcProtos.TestDelayedService.BlockingInterface stub =
TestDelayedRpcProtos.TestDelayedService.newBlockingStub(channel);
List<Integer> results = new ArrayList<Integer>();
// Setting true sets 'delayed' on the client.
TestThread th1 = new TestThread(stub, true, results);
// Setting 'false' means we will return UNDELAYED as response immediately.
TestThread th2 = new TestThread(stub, false, results);
TestThread th3 = new TestThread(stub, false, results);
th1.start();
Thread.sleep(100);
th2.start();
Thread.sleep(200);
th3.start();
th1.join();
th2.join();
th3.join();
// We should get the two undelayed responses first.
assertEquals(UNDELAYED, results.get(0).intValue());
assertEquals(UNDELAYED, results.get(1).intValue());
assertEquals(results.get(2).intValue(), delayReturnValue ? DELAYED : 0xDEADBEEF);
} finally {
rpcClient.close();
}
}
private static class ListAppender extends AppenderSkeleton {
private final List<String> messages = new ArrayList<String>();
@Override
protected void append(LoggingEvent event) {
messages.add(event.getMessage().toString());
}
@Override
public void close() {
}
@Override
public boolean requiresLayout() {
return false;
}
public List<String> getMessages() {
return messages;
}
}
/**
* Tests that we see a WARN message in the logs.
* @throws Exception
*/
@Test (timeout=60000)
public void testTooManyDelayedRpcs() throws Exception {
Configuration conf = HBaseConfiguration.create();
final int MAX_DELAYED_RPC = 10;
conf.setInt("hbase.ipc.warn.delayedrpc.number", MAX_DELAYED_RPC);
// Set up an appender to catch the "Too many delayed calls" that we expect.
ListAppender listAppender = new ListAppender();
Logger log = Logger.getLogger(RpcServer.class);
log.addAppender(listAppender);
log.setLevel(Level.WARN);
InetSocketAddress isa = new InetSocketAddress("localhost", 0);
TestDelayedImplementation instance = new TestDelayedImplementation(true);
BlockingService service =
TestDelayedRpcProtos.TestDelayedService.newReflectiveBlockingService(instance);
rpcServer = new RpcServer(null, "testTooManyDelayedRpcs",
Lists.newArrayList(new RpcServer.BlockingServiceAndInterface(service, null)),
isa,
conf,
new FifoRpcScheduler(conf, 1));
rpcServer.start();
RpcClient rpcClient = RpcClientFactory.createClient(
conf, HConstants.DEFAULT_CLUSTER_ID.toString());
try {
BlockingRpcChannel channel = rpcClient.createBlockingRpcChannel(
ServerName.valueOf(rpcServer.getListenerAddress().getHostName(),
rpcServer.getListenerAddress().getPort(), System.currentTimeMillis()),
User.getCurrent(), RPC_CLIENT_TIMEOUT);
TestDelayedRpcProtos.TestDelayedService.BlockingInterface stub =
TestDelayedRpcProtos.TestDelayedService.newBlockingStub(channel);
Thread threads[] = new Thread[MAX_DELAYED_RPC + 1];
for (int i = 0; i < MAX_DELAYED_RPC; i++) {
threads[i] = new TestThread(stub, true, null);
threads[i].start();
}
/* No warnings till here. */
assertTrue(listAppender.getMessages().isEmpty());
/* This should give a warning. */
threads[MAX_DELAYED_RPC] = new TestThread(stub, true, null);
threads[MAX_DELAYED_RPC].start();
for (int i = 0; i < MAX_DELAYED_RPC; i++) {
threads[i].join();
}
assertFalse(listAppender.getMessages().isEmpty());
assertTrue(listAppender.getMessages().get(0).startsWith("Too many delayed calls"));
log.removeAppender(listAppender);
} finally {
rpcClient.close();
}
}
public static class TestDelayedImplementation
implements TestDelayedRpcProtos.TestDelayedService.BlockingInterface {
/**
* Should the return value of delayed call be set at the end of the delay
* or at call return.
*/
private final boolean delayReturnValue;
/**
* @param delayReturnValue Should the response to the delayed call be set
* at the start or the end of the delay.
*/
public TestDelayedImplementation(boolean delayReturnValue) {
this.delayReturnValue = delayReturnValue;
}
@Override
public TestResponse test(final RpcController rpcController, final TestArg testArg)
throws ServiceException {
boolean delay = testArg.getDelay();
TestResponse.Builder responseBuilder = TestResponse.newBuilder();
if (!delay) {
responseBuilder.setResponse(UNDELAYED);
return responseBuilder.build();
}
final Delayable call = RpcServer.getCurrentCall();
call.startDelay(delayReturnValue);
new Thread() {
@Override
public void run() {
try {
Thread.sleep(500);
TestResponse.Builder responseBuilder = TestResponse.newBuilder();
call.endDelay(delayReturnValue ?
responseBuilder.setResponse(DELAYED).build() : null);
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
// This value should go back to client only if the response is set
// immediately at delay time.
responseBuilder.setResponse(0xDEADBEEF);
return responseBuilder.build();
}
}
public static class TestThread extends Thread {
private final TestDelayedRpcProtos.TestDelayedService.BlockingInterface stub;
private final boolean delay;
private final List<Integer> results;
public TestThread(TestDelayedRpcProtos.TestDelayedService.BlockingInterface stub,
boolean delay, List<Integer> results) {
this.stub = stub;
this.delay = delay;
this.results = results;
}
@Override
public void run() {
Integer result;
try {
result = new Integer(stub.test(null, TestArg.newBuilder().setDelay(delay).build()).
getResponse());
} catch (ServiceException e) {
throw new RuntimeException(e);
}
if (results != null) {
synchronized (results) {
results.add(result);
}
}
}
}
@Test
public void testEndDelayThrowing() throws IOException {
Configuration conf = HBaseConfiguration.create();
InetSocketAddress isa = new InetSocketAddress("localhost", 0);
FaultyTestDelayedImplementation instance = new FaultyTestDelayedImplementation();
BlockingService service =
TestDelayedRpcProtos.TestDelayedService.newReflectiveBlockingService(instance);
rpcServer = new RpcServer(null, "testEndDelayThrowing",
Lists.newArrayList(new RpcServer.BlockingServiceAndInterface(service, null)),
isa,
conf,
new FifoRpcScheduler(conf, 1));
rpcServer.start();
RpcClient rpcClient = RpcClientFactory.createClient(
conf, HConstants.DEFAULT_CLUSTER_ID.toString());
try {
BlockingRpcChannel channel = rpcClient.createBlockingRpcChannel(
ServerName.valueOf(rpcServer.getListenerAddress().getHostName(),
rpcServer.getListenerAddress().getPort(), System.currentTimeMillis()),
User.getCurrent(), 1000);
TestDelayedRpcProtos.TestDelayedService.BlockingInterface stub =
TestDelayedRpcProtos.TestDelayedService.newBlockingStub(channel);
int result = 0xDEADBEEF;
try {
result = stub.test(null, TestArg.newBuilder().setDelay(false).build()).getResponse();
} catch (Exception e) {
fail("No exception should have been thrown.");
}
assertEquals(result, UNDELAYED);
boolean caughtException = false;
try {
result = stub.test(null, TestArg.newBuilder().setDelay(true).build()).getResponse();
} catch(Exception e) {
// Exception thrown by server is enclosed in a RemoteException.
if (e.getCause().getMessage().contains("java.lang.Exception: Something went wrong")) {
caughtException = true;
}
LOG.warn("Caught exception, expected=" + caughtException);
}
assertTrue(caughtException);
} finally {
rpcClient.close();
}
}
/**
* Delayed calls to this class throw an exception.
*/
private static class FaultyTestDelayedImplementation extends TestDelayedImplementation {
public FaultyTestDelayedImplementation() {
super(false);
}
@Override
public TestResponse test(RpcController rpcController, TestArg arg)
throws ServiceException {
LOG.info("In faulty test, delay=" + arg.getDelay());
if (!arg.getDelay()) return TestResponse.newBuilder().setResponse(UNDELAYED).build();
Delayable call = RpcServer.getCurrentCall();
call.startDelay(true);
LOG.info("In faulty test, delaying");
try {
call.endDelayThrowing(new Exception("Something went wrong"));
} catch (IOException e) {
e.printStackTrace();
}
// Client will receive the Exception, not this value.
return TestResponse.newBuilder().setResponse(DELAYED).build();
}
}
}