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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.mapred;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.Map;
import java.util.Vector;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.TaskLog.LogName;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.TaskType;
import org.apache.hadoop.mapreduce.v2.util.MRApps;
import org.apache.hadoop.yarn.api.ApplicationConstants;
import org.apache.hadoop.yarn.api.ApplicationConstants.Environment;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
@SuppressWarnings("deprecation")
public class MapReduceChildJVM {
private static String getTaskLogFile(LogName filter) {
return ApplicationConstants.LOG_DIR_EXPANSION_VAR + Path.SEPARATOR +
filter.toString();
}
private static String getChildEnvProp(JobConf jobConf, boolean isMap) {
if (isMap) {
return JobConf.MAPRED_MAP_TASK_ENV;
}
return JobConf.MAPRED_REDUCE_TASK_ENV;
}
private static String getChildEnvDefaultValue(JobConf jobConf) {
// There is no default value for these - use the fallback value instead.
return jobConf.get(JobConf.MAPRED_TASK_ENV);
}
public static void setVMEnv(Map environment,
Task task) {
JobConf conf = task.conf;
boolean isMap = task.isMapTask();
// Remove these before adding the user variables to prevent
// MRApps.setEnvFromInputProperty() from appending to them.
String hadoopRootLoggerKey = "HADOOP_ROOT_LOGGER";
String hadoopClientOptsKey = "HADOOP_CLIENT_OPTS";
environment.remove(hadoopRootLoggerKey);
environment.remove(hadoopClientOptsKey);
// Add the environment variables passed by the user
MRApps.setEnvFromInputProperty(environment, getChildEnvProp(conf, isMap),
getChildEnvDefaultValue(conf), conf);
// Set HADOOP_ROOT_LOGGER and HADOOP_CLIENTS if the user did not set them.
if (!environment.containsKey(hadoopRootLoggerKey)) {
// Set the value for logging level in the environment.
// This is so that, if the child forks another "bin/hadoop" (common in
// streaming) it will have the correct loglevel.
environment.put(hadoopRootLoggerKey,
MRApps.getChildLogLevel(conf, task.isMapTask()) + ",console");
}
if (!environment.containsKey(hadoopClientOptsKey)) {
// TODO: The following is useful for instance in streaming tasks.
// Should be set in ApplicationMaster's env by the RM.
String hadoopClientOptsValue = System.getenv(hadoopClientOptsKey);
if (hadoopClientOptsValue == null) {
hadoopClientOptsValue = "";
} else {
hadoopClientOptsValue = hadoopClientOptsValue + " ";
}
environment.put(hadoopClientOptsKey, hadoopClientOptsValue);
}
// Add stdout/stderr env
environment.put(
MRJobConfig.STDOUT_LOGFILE_ENV,
getTaskLogFile(TaskLog.LogName.STDOUT)
);
environment.put(
MRJobConfig.STDERR_LOGFILE_ENV,
getTaskLogFile(TaskLog.LogName.STDERR)
);
}
private static String getChildJavaOpts(JobConf jobConf, boolean isMapTask) {
return jobConf.getTaskJavaOpts(isMapTask ? TaskType.MAP : TaskType.REDUCE);
}
public static List getVMCommand(
InetSocketAddress taskAttemptListenerAddr, Task task,
JVMId jvmID) {
TaskAttemptID attemptID = task.getTaskID();
JobConf conf = task.conf;
Vector vargs = new Vector(8);
vargs.add(MRApps.crossPlatformifyMREnv(task.conf, Environment.JAVA_HOME)
+ "/bin/java");
// Add child (task) java-vm options.
//
// The following symbols if present in mapred.{map|reduce}.child.java.opts
// value are replaced:
// + @taskid@ is interpolated with value of TaskID.
// Other occurrences of @ will not be altered.
//
// Example with multiple arguments and substitutions, showing
// jvm GC logging, and start of a passwordless JVM JMX agent so can
// connect with jconsole and the likes to watch child memory, threads
// and get thread dumps.
//
//
// mapred.map.child.java.opts
// -Xmx 512M -verbose:gc -Xloggc:/tmp/@[email protected] \
// -Dcom.sun.management.jmxremote.authenticate=false \
// -Dcom.sun.management.jmxremote.ssl=false \
//
//
//
//
// mapred.reduce.child.java.opts
// -Xmx 1024M -verbose:gc -Xloggc:/tmp/@[email protected] \
// -Dcom.sun.management.jmxremote.authenticate=false \
// -Dcom.sun.management.jmxremote.ssl=false \
//
//
//
String javaOpts = getChildJavaOpts(conf, task.isMapTask());
javaOpts = javaOpts.replace("@taskid@", attemptID.toString());
String [] javaOptsSplit = javaOpts.split(" ");
for (int i = 0; i < javaOptsSplit.length; i++) {
vargs.add(javaOptsSplit[i]);
}
Path childTmpDir = new Path(MRApps.crossPlatformifyMREnv(conf, Environment.PWD),
YarnConfiguration.DEFAULT_CONTAINER_TEMP_DIR);
vargs.add("-Djava.io.tmpdir=" + childTmpDir);
MRApps.addLog4jSystemProperties(task, vargs, conf);
if (conf.getProfileEnabled()) {
if (conf.getProfileTaskRange(task.isMapTask()
).isIncluded(task.getPartition())) {
final String profileParams = conf.get(task.isMapTask()
? MRJobConfig.TASK_MAP_PROFILE_PARAMS
: MRJobConfig.TASK_REDUCE_PROFILE_PARAMS, conf.getProfileParams());
vargs.add(String.format(profileParams,
getTaskLogFile(TaskLog.LogName.PROFILE)));
}
}
// Add main class and its arguments
vargs.add(YarnChild.class.getName()); // main of Child
// pass TaskAttemptListener's address
vargs.add(taskAttemptListenerAddr.getAddress().getHostAddress());
vargs.add(Integer.toString(taskAttemptListenerAddr.getPort()));
vargs.add(attemptID.toString()); // pass task identifier
// Finally add the jvmID
vargs.add(String.valueOf(jvmID.getId()));
vargs.add("1>" + getTaskLogFile(TaskLog.LogName.STDOUT));
vargs.add("2>" + getTaskLogFile(TaskLog.LogName.STDERR));
// Final commmand
StringBuilder mergedCommand = new StringBuilder();
for (CharSequence str : vargs) {
mergedCommand.append(str).append(" ");
}
Vector vargsFinal = new Vector(1);
vargsFinal.add(mergedCommand.toString());
return vargsFinal;
}
}
