/*
* 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 com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.io.Files;
import com.google.common.util.concurrent.Service;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.twill.api.LocalFile;
import org.apache.twill.api.RunId;
import org.apache.twill.api.RuntimeSpecification;
import org.apache.twill.api.TwillRunnableSpecification;
import org.apache.twill.api.TwillSpecification;
import org.apache.twill.discovery.DiscoveryService;
import org.apache.twill.discovery.ZKDiscoveryService;
import org.apache.twill.internal.Arguments;
import org.apache.twill.internal.BasicTwillContext;
import org.apache.twill.internal.Constants;
import org.apache.twill.internal.ContainerInfo;
import org.apache.twill.internal.EnvContainerInfo;
import org.apache.twill.internal.EnvKeys;
import org.apache.twill.internal.RunIds;
import org.apache.twill.internal.ServiceMain;
import org.apache.twill.internal.json.ArgumentsCodec;
import org.apache.twill.internal.json.TwillSpecificationAdapter;
import org.apache.twill.zookeeper.RetryStrategies;
import org.apache.twill.zookeeper.ZKClient;
import org.apache.twill.zookeeper.ZKClientService;
import org.apache.twill.zookeeper.ZKClientServices;
import org.apache.twill.zookeeper.ZKClients;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.Reader;
import java.util.concurrent.TimeUnit;
/**
*
*/
public final class TwillContainerMain extends ServiceMain {
private static final Logger LOG = LoggerFactory.getLogger(TwillContainerMain.class);
/**
* Main method for launching a {@link TwillContainerService} which runs
* a {@link org.apache.twill.api.TwillRunnable}.
*/
public static void main(final String[] args) throws Exception {
// Try to load the secure store from localized file, which AM requested RM to localize it for this container.
loadSecureStore();
String zkConnectStr = System.getenv(EnvKeys.TWILL_ZK_CONNECT);
File twillSpecFile = new File(Constants.Files.TWILL_SPEC);
RunId appRunId = RunIds.fromString(System.getenv(EnvKeys.TWILL_APP_RUN_ID));
RunId runId = RunIds.fromString(System.getenv(EnvKeys.TWILL_RUN_ID));
String runnableName = System.getenv(EnvKeys.TWILL_RUNNABLE_NAME);
int instanceId = Integer.parseInt(System.getenv(EnvKeys.TWILL_INSTANCE_ID));
int instanceCount = Integer.parseInt(System.getenv(EnvKeys.TWILL_INSTANCE_COUNT));
ZKClientService zkClientService = ZKClientServices.delegate(
ZKClients.reWatchOnExpire(
ZKClients.retryOnFailure(ZKClientService.Builder.of(zkConnectStr).build(),
RetryStrategies.fixDelay(1, TimeUnit.SECONDS))));
DiscoveryService discoveryService = new ZKDiscoveryService(zkClientService);
TwillSpecification twillSpec = loadTwillSpec(twillSpecFile);
renameLocalFiles(twillSpec.getRunnables().get(runnableName));
TwillRunnableSpecification runnableSpec = twillSpec.getRunnables().get(runnableName).getRunnableSpecification();
ContainerInfo containerInfo = new EnvContainerInfo();
Arguments arguments = decodeArgs();
BasicTwillContext context = new BasicTwillContext(
runId, appRunId, containerInfo.getHost(),
arguments.getRunnableArguments().get(runnableName).toArray(new String[0]),
arguments.getArguments().toArray(new String[0]),
runnableSpec, instanceId, discoveryService, instanceCount,
containerInfo.getMemoryMB(), containerInfo.getVirtualCores()
);
Configuration conf = new YarnConfiguration(new HdfsConfiguration(new Configuration()));
Service service = new TwillContainerService(context, containerInfo,
getContainerZKClient(zkClientService, appRunId, runnableName),
runId, runnableSpec, getClassLoader(),
createAppLocation(conf));
new TwillContainerMain().doMain(zkClientService, service);
}
private static void loadSecureStore() throws IOException {
if (!UserGroupInformation.isSecurityEnabled()) {
return;
}
File file = new File(Constants.Files.CREDENTIALS);
if (file.exists()) {
Credentials credentials = new Credentials();
DataInputStream input = new DataInputStream(new FileInputStream(file));
try {
credentials.readTokenStorageStream(input);
} finally {
input.close();
}
UserGroupInformation.getCurrentUser().addCredentials(credentials);
LOG.info("Secure store updated from {}", file);
}
}
private static void renameLocalFiles(RuntimeSpecification runtimeSpec) {
for (LocalFile file : runtimeSpec.getLocalFiles()) {
if (file.isArchive()) {
String path = file.getURI().toString();
String name = file.getName() + (path.endsWith(".tar.gz") ? ".tar.gz" : path.substring(path.lastIndexOf('.')));
Preconditions.checkState(new File(name).renameTo(new File(file.getName())),
"Fail to rename file from %s to %s.",
name, file.getName());
}
}
}
private static ZKClient getContainerZKClient(ZKClient zkClient, RunId appRunId, String runnableName) {
return ZKClients.namespace(zkClient, String.format("/%s/runnables/%s", appRunId, runnableName));
}
/**
* Returns the ClassLoader for the runnable.
*/
private static ClassLoader getClassLoader() {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
return ClassLoader.getSystemClassLoader();
}
return classLoader;
}
private static TwillSpecification loadTwillSpec(File specFile) throws IOException {
Reader reader = Files.newReader(specFile, Charsets.UTF_8);
try {
return TwillSpecificationAdapter.create().fromJson(reader);
} finally {
reader.close();
}
}
private static Arguments decodeArgs() throws IOException {
return ArgumentsCodec.decode(Files.newReaderSupplier(new File(Constants.Files.ARGUMENTS), Charsets.UTF_8));
}
@Override
protected String getHostname() {
return System.getenv(EnvKeys.YARN_CONTAINER_HOST);
}
@Override
protected String getKafkaZKConnect() {
return System.getenv(EnvKeys.TWILL_LOG_KAFKA_ZK);
}
}