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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.twill.internal.container;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import org.apache.hadoop.conf.Configuration;
import org.apache.twill.api.Command;
import org.apache.twill.api.RunId;
import org.apache.twill.api.TwillRunnable;
import org.apache.twill.api.TwillRunnableSpecification;
import org.apache.twill.api.logging.LogEntry;
import org.apache.twill.common.Threads;
import org.apache.twill.filesystem.Location;
import org.apache.twill.internal.BasicTwillContext;
import org.apache.twill.internal.ContainerInfo;
import org.apache.twill.internal.ContainerLiveNodeData;
import org.apache.twill.internal.state.Message;
import org.apache.twill.internal.state.SystemMessages;
import org.apache.twill.internal.utils.Instances;
import org.apache.twill.internal.yarn.AbstractYarnTwillService;
import org.apache.twill.zookeeper.ZKClient;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.annotation.Nullable;
/**
* This class act as a yarn container and run a {@link org.apache.twill.api.TwillRunnable}.
*/
public final class TwillContainerService extends AbstractYarnTwillService {
private static final Logger LOG = LoggerFactory.getLogger(TwillContainerService.class);
private final TwillRunnableSpecification specification;
private final ClassLoader classLoader;
private final BasicTwillContext context;
private final ContainerLiveNodeData containerLiveNodeData;
private final Map oldLogLevels;
private final Map defaultLogLevels;
private ExecutorService commandExecutor;
private TwillRunnable runnable;
TwillContainerService(BasicTwillContext context, ContainerInfo containerInfo, ZKClient zkClient,
RunId runId, TwillRunnableSpecification specification, ClassLoader classLoader,
Configuration config, Location applicationLocation,
Map defaultLogLevels, Map logLevels) {
super(zkClient, runId, config, applicationLocation);
this.specification = specification;
this.classLoader = classLoader;
this.defaultLogLevels = ImmutableMap.copyOf(defaultLogLevels);
this.oldLogLevels = new HashMap<>(defaultLogLevels);
this.containerLiveNodeData = createLiveNodeData(
containerInfo, isLoggerContext() ? logLevels : Collections.emptyMap());
this.context = context;
}
private ContainerLiveNodeData createLiveNodeData(ContainerInfo containerInfo,
Map logLevels) {
// if debugging is enabled, log the port and register it in service discovery.
String debugPort = System.getProperty("twill.debug.port");
if (debugPort != null) {
LOG.info("JVM is listening for debugger on port {}", debugPort);
}
return new ContainerLiveNodeData(containerInfo.getId(),
containerInfo.getHost().getCanonicalHostName(), debugPort, logLevels);
}
@Override
protected Object getLiveNodeData() {
return containerLiveNodeData;
}
@Override
public ListenableFuture onReceived(final String messageId, final Message message) {
LOG.debug("Message received: {} {}.", messageId, message);
if (handleSecureStoreUpdate(message)) {
return Futures.immediateFuture(messageId);
}
final SettableFuture result = SettableFuture.create();
Command command = message.getCommand();
if (message.getType() == Message.Type.SYSTEM
&& "instances".equals(command.getCommand()) && command.getOptions().containsKey("count")) {
context.setInstanceCount(Integer.parseInt(command.getOptions().get("count")));
}
String commandStr = command.getCommand();
if (message.getType() == Message.Type.SYSTEM) {
boolean handled = false;
if (SystemMessages.SET_LOG_LEVEL.equals(commandStr)) {
// The options is a map from logger name to log level.
setLogLevels(command.getOptions());
handled = true;
} else if (SystemMessages.RESET_LOG_LEVEL.equals(commandStr)) {
// The options is a set of loggers to reset in the form of loggerName -> loggerName map.
resetLogLevels(command.getOptions().keySet());
handled = true;
}
if (handled) {
updateLiveNode();
return Futures.immediateFuture(messageId);
}
}
commandExecutor.execute(new Runnable() {
@Override
public void run() {
try {
runnable.handleCommand(message.getCommand());
result.set(messageId);
} catch (Exception e) {
result.setException(e);
}
}
});
return result;
}
/**
* Sets the log levels for the given set of loggers.
*
* @param logLevels a map from logger name to log level to be set
*/
private void setLogLevels(Map logLevels) {
for (Map.Entry entry : logLevels.entrySet()) {
String loggerName = entry.getKey();
String logLevel = entry.getValue();
// Setting the log level in logging system as well as in the container live node
String oldLogLevel = setLogLevel(loggerName, logLevel);
containerLiveNodeData.setLogLevel(loggerName, logLevel);
if (!oldLogLevels.containsKey(loggerName)) {
String defaultLogLevel = defaultLogLevels.get(loggerName);
oldLogLevels.put(loggerName, defaultLogLevel == null ? oldLogLevel : defaultLogLevel);
}
}
}
/**
* Resets the log levels for the given set of loggers. If the set is empty, reset all loggers that have been set
* before.
*/
private void resetLogLevels(Set loggerNames) {
Iterator> entryIterator = oldLogLevels.entrySet().iterator();
while (entryIterator.hasNext()) {
Map.Entry entry = entryIterator.next();
String loggerName = entry.getKey();
// logger name is empty if we are resetting all loggers.
if (loggerNames.isEmpty() || loggerNames.contains(loggerName)) {
String oldLogLevel = entry.getValue();
setLogLevel(loggerName, oldLogLevel);
if (oldLogLevel == null || !defaultLogLevels.containsKey(loggerName)) {
containerLiveNodeData.removeLogLevel(loggerName);
entryIterator.remove();
} else {
containerLiveNodeData.setLogLevel(loggerName, oldLogLevel);
}
}
}
}
@SuppressWarnings("unchecked")
@Override
protected void doStart() throws Exception {
for (Map.Entry entry : containerLiveNodeData.getLogLevels().entrySet()) {
String loggerName = entry.getKey();
String oldLogLevel = setLogLevel(loggerName, entry.getValue());
if (!defaultLogLevels.containsKey(loggerName)) {
oldLogLevels.put(loggerName, oldLogLevel);
}
}
commandExecutor = Executors.newSingleThreadExecutor(
Threads.createDaemonThreadFactory("runnable-command-executor"));
Class runnableClass = classLoader.loadClass(specification.getClassName());
Preconditions.checkArgument(TwillRunnable.class.isAssignableFrom(runnableClass),
"Class %s is not instance of TwillRunnable.", specification.getClassName());
runnable = Instances.newInstance((Class) runnableClass);
runnable.initialize(context);
}
@Override
protected void doRun() throws Exception {
runnable.run();
}
@Override
protected void doStop() throws Exception {
commandExecutor.shutdownNow();
try {
runnable.destroy();
} catch (Throwable t) {
// Just catch the exception, not propagate it since it's already in shutdown sequence and
// we want all twill services properly shutdown.
LOG.warn("Exception when calling runnable.destroy.", t);
} finally {
context.stop();
}
}
@Override
protected void triggerShutdown() {
try {
runnable.stop();
} catch (Throwable t) {
LOG.error("Exception when stopping runnable.", t);
}
}
private boolean isLoggerContext() {
ILoggerFactory loggerFactory = LoggerFactory.getILoggerFactory();
return loggerFactory instanceof LoggerContext;
}
/**
* Set the log level for the requested logger name.
*
* @param loggerName name of the logger
* @param logLevel the log level to set to.
* @return the current log level of the given logger. If there is no log level configured for the given logger or
* if the logging implementation is not logback, {@code null} will be returned
*/
@Nullable
private String setLogLevel(String loggerName, @Nullable String logLevel) {
ILoggerFactory loggerFactory = LoggerFactory.getILoggerFactory();
if (!(loggerFactory instanceof LoggerContext)) {
LOG.error("LoggerFactory is not a logback LoggerContext, cannot make the log level change");
return null;
}
LoggerContext loggerContext = (LoggerContext) loggerFactory;
ch.qos.logback.classic.Logger logger = loggerContext.getLogger(loggerName);
LogEntry.Level oldLogLevel = logger.getLevel() == null ? null :
LogEntry.Level.valueOf(logger.getLevel().toString());
LOG.debug("Log level of {} changed from {} to {}", loggerName, oldLogLevel, logLevel);
logger.setLevel(logLevel == null ? null : Level.toLevel(logLevel, Level.ERROR));
return oldLogLevel == null ? null : oldLogLevel.name();
}
}
