/**
* 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.yarn.sls.appmaster;
import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
import org.apache.hadoop.yarn.api.records.Container;
import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerStatus;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.security.AMRMTokenIdentifier;
import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
import org.apache.hadoop.yarn.server.utils.BuilderUtils;
import org.apache.hadoop.yarn.sls.scheduler.ContainerSimulator;
import org.apache.hadoop.yarn.sls.SLSRunner;
import org.apache.log4j.Logger;
public class MRAMSimulator extends AMSimulator {
/*
Vocabulary Used:
pending -> requests which are NOT yet sent to RM
scheduled -> requests which are sent to RM but not yet assigned
assigned -> requests which are assigned to a container
completed -> request corresponding to which container has completed
Maps are scheduled as soon as their requests are received. Reduces are
scheduled when all maps have finished (not support slow-start currently).
*/
private static final int PRIORITY_REDUCE = 10;
private static final int PRIORITY_MAP = 20;
// pending maps
private LinkedList<ContainerSimulator> pendingMaps =
new LinkedList<ContainerSimulator>();
// pending failed maps
private LinkedList<ContainerSimulator> pendingFailedMaps =
new LinkedList<ContainerSimulator>();
// scheduled maps
private LinkedList<ContainerSimulator> scheduledMaps =
new LinkedList<ContainerSimulator>();
// assigned maps
private Map<ContainerId, ContainerSimulator> assignedMaps =
new HashMap<ContainerId, ContainerSimulator>();
// reduces which are not yet scheduled
private LinkedList<ContainerSimulator> pendingReduces =
new LinkedList<ContainerSimulator>();
// pending failed reduces
private LinkedList<ContainerSimulator> pendingFailedReduces =
new LinkedList<ContainerSimulator>();
// scheduled reduces
private LinkedList<ContainerSimulator> scheduledReduces =
new LinkedList<ContainerSimulator>();
// assigned reduces
private Map<ContainerId, ContainerSimulator> assignedReduces =
new HashMap<ContainerId, ContainerSimulator>();
// all maps & reduces
private LinkedList<ContainerSimulator> allMaps =
new LinkedList<ContainerSimulator>();
private LinkedList<ContainerSimulator> allReduces =
new LinkedList<ContainerSimulator>();
// counters
private int mapFinished = 0;
private int mapTotal = 0;
private int reduceFinished = 0;
private int reduceTotal = 0;
// waiting for AM container
private boolean isAMContainerRunning = false;
private Container amContainer;
// finished
private boolean isFinished = false;
// resource for AM container
private final static int MR_AM_CONTAINER_RESOURCE_MEMORY_MB = 1024;
private final static int MR_AM_CONTAINER_RESOURCE_VCORES = 1;
public final Logger LOG = Logger.getLogger(MRAMSimulator.class);
public void init(int id, int heartbeatInterval,
List<ContainerSimulator> containerList, ResourceManager rm, SLSRunner se,
long traceStartTime, long traceFinishTime, String user, String queue,
boolean isTracked, String oldAppId) {
super.init(id, heartbeatInterval, containerList, rm, se,
traceStartTime, traceFinishTime, user, queue,
isTracked, oldAppId);
amtype = "mapreduce";
// get map/reduce tasks
for (ContainerSimulator cs : containerList) {
if (cs.getType().equals("map")) {
cs.setPriority(PRIORITY_MAP);
pendingMaps.add(cs);
} else if (cs.getType().equals("reduce")) {
cs.setPriority(PRIORITY_REDUCE);
pendingReduces.add(cs);
}
}
allMaps.addAll(pendingMaps);
allReduces.addAll(pendingReduces);
mapTotal = pendingMaps.size();
reduceTotal = pendingReduces.size();
totalContainers = mapTotal + reduceTotal;
}
@Override
public void firstStep()
throws YarnException, IOException, InterruptedException {
super.firstStep();
requestAMContainer();
}
/**
* send out request for AM container
*/
protected void requestAMContainer()
throws YarnException, IOException, InterruptedException {
List<ResourceRequest> ask = new ArrayList<ResourceRequest>();
ResourceRequest amRequest = createResourceRequest(
BuilderUtils.newResource(MR_AM_CONTAINER_RESOURCE_MEMORY_MB,
MR_AM_CONTAINER_RESOURCE_VCORES),
ResourceRequest.ANY, 1, 1);
ask.add(amRequest);
LOG.debug(MessageFormat.format("Application {0} sends out allocate " +
"request for its AM", appId));
final AllocateRequest request = this.createAllocateRequest(ask);
UserGroupInformation ugi =
UserGroupInformation.createRemoteUser(appAttemptId.toString());
Token<AMRMTokenIdentifier> token = rm.getRMContext().getRMApps()
.get(appAttemptId.getApplicationId())
.getRMAppAttempt(appAttemptId).getAMRMToken();
ugi.addTokenIdentifier(token.decodeIdentifier());
AllocateResponse response = ugi.doAs(
new PrivilegedExceptionAction<AllocateResponse>() {
@Override
public AllocateResponse run() throws Exception {
return rm.getApplicationMasterService().allocate(request);
}
});
// waiting until the AM container is allocated
while (true) {
if (response != null && ! response.getAllocatedContainers().isEmpty()) {
// get AM container
Container container = response.getAllocatedContainers().get(0);
se.getNmMap().get(container.getNodeId())
.addNewContainer(container, -1L);
// start AM container
amContainer = container;
LOG.debug(MessageFormat.format("Application {0} starts its " +
"AM container ({1}).", appId, amContainer.getId()));
isAMContainerRunning = true;
break;
}
// this sleep time is different from HeartBeat
Thread.sleep(1000);
// send out empty request
sendContainerRequest();
response = responseQueue.take();
}
}
@Override
@SuppressWarnings("unchecked")
protected void processResponseQueue()
throws InterruptedException, YarnException, IOException {
while (! responseQueue.isEmpty()) {
AllocateResponse response = responseQueue.take();
// check completed containers
if (! response.getCompletedContainersStatuses().isEmpty()) {
for (ContainerStatus cs : response.getCompletedContainersStatuses()) {
ContainerId containerId = cs.getContainerId();
if (cs.getExitStatus() == ContainerExitStatus.SUCCESS) {
if (assignedMaps.containsKey(containerId)) {
LOG.debug(MessageFormat.format("Application {0} has one" +
"mapper finished ({1}).", appId, containerId));
assignedMaps.remove(containerId);
mapFinished ++;
finishedContainers ++;
} else if (assignedReduces.containsKey(containerId)) {
LOG.debug(MessageFormat.format("Application {0} has one" +
"reducer finished ({1}).", appId, containerId));
assignedReduces.remove(containerId);
reduceFinished ++;
finishedContainers ++;
} else {
// am container released event
isFinished = true;
LOG.info(MessageFormat.format("Application {0} goes to " +
"finish.", appId));
}
} else {
// container to be killed
if (assignedMaps.containsKey(containerId)) {
LOG.debug(MessageFormat.format("Application {0} has one " +
"mapper killed ({1}).", appId, containerId));
pendingFailedMaps.add(assignedMaps.remove(containerId));
} else if (assignedReduces.containsKey(containerId)) {
LOG.debug(MessageFormat.format("Application {0} has one " +
"reducer killed ({1}).", appId, containerId));
pendingFailedReduces.add(assignedReduces.remove(containerId));
} else {
LOG.info(MessageFormat.format("Application {0}'s AM is " +
"going to be killed. Restarting...", appId));
restart();
}
}
}
}
// check finished
if (isAMContainerRunning &&
(mapFinished == mapTotal) &&
(reduceFinished == reduceTotal)) {
// to release the AM container
se.getNmMap().get(amContainer.getNodeId())
.cleanupContainer(amContainer.getId());
isAMContainerRunning = false;
LOG.debug(MessageFormat.format("Application {0} sends out event " +
"to clean up its AM container.", appId));
isFinished = true;
}
// check allocated containers
for (Container container : response.getAllocatedContainers()) {
if (! scheduledMaps.isEmpty()) {
ContainerSimulator cs = scheduledMaps.remove();
LOG.debug(MessageFormat.format("Application {0} starts a " +
"launch a mapper ({1}).", appId, container.getId()));
assignedMaps.put(container.getId(), cs);
se.getNmMap().get(container.getNodeId())
.addNewContainer(container, cs.getLifeTime());
} else if (! this.scheduledReduces.isEmpty()) {
ContainerSimulator cs = scheduledReduces.remove();
LOG.debug(MessageFormat.format("Application {0} starts a " +
"launch a reducer ({1}).", appId, container.getId()));
assignedReduces.put(container.getId(), cs);
se.getNmMap().get(container.getNodeId())
.addNewContainer(container, cs.getLifeTime());
}
}
}
}
/**
* restart running because of the am container killed
*/
private void restart()
throws YarnException, IOException, InterruptedException {
// clear
finishedContainers = 0;
isFinished = false;
mapFinished = 0;
reduceFinished = 0;
pendingFailedMaps.clear();
pendingMaps.clear();
pendingReduces.clear();
pendingFailedReduces.clear();
pendingMaps.addAll(allMaps);
pendingReduces.addAll(pendingReduces);
isAMContainerRunning = false;
amContainer = null;
// resent am container request
requestAMContainer();
}
@Override
protected void sendContainerRequest()
throws YarnException, IOException, InterruptedException {
if (isFinished) {
return;
}
// send out request
List<ResourceRequest> ask = null;
if (isAMContainerRunning) {
if (mapFinished != mapTotal) {
// map phase
if (! pendingMaps.isEmpty()) {
ask = packageRequests(pendingMaps, PRIORITY_MAP);
LOG.debug(MessageFormat.format("Application {0} sends out " +
"request for {1} mappers.", appId, pendingMaps.size()));
scheduledMaps.addAll(pendingMaps);
pendingMaps.clear();
} else if (! pendingFailedMaps.isEmpty() && scheduledMaps.isEmpty()) {
ask = packageRequests(pendingFailedMaps, PRIORITY_MAP);
LOG.debug(MessageFormat.format("Application {0} sends out " +
"requests for {1} failed mappers.", appId,
pendingFailedMaps.size()));
scheduledMaps.addAll(pendingFailedMaps);
pendingFailedMaps.clear();
}
} else if (reduceFinished != reduceTotal) {
// reduce phase
if (! pendingReduces.isEmpty()) {
ask = packageRequests(pendingReduces, PRIORITY_REDUCE);
LOG.debug(MessageFormat.format("Application {0} sends out " +
"requests for {1} reducers.", appId, pendingReduces.size()));
scheduledReduces.addAll(pendingReduces);
pendingReduces.clear();
} else if (! pendingFailedReduces.isEmpty()
&& scheduledReduces.isEmpty()) {
ask = packageRequests(pendingFailedReduces, PRIORITY_REDUCE);
LOG.debug(MessageFormat.format("Application {0} sends out " +
"request for {1} failed reducers.", appId,
pendingFailedReduces.size()));
scheduledReduces.addAll(pendingFailedReduces);
pendingFailedReduces.clear();
}
}
}
if (ask == null) {
ask = new ArrayList<ResourceRequest>();
}
final AllocateRequest request = createAllocateRequest(ask);
if (totalContainers == 0) {
request.setProgress(1.0f);
} else {
request.setProgress((float) finishedContainers / totalContainers);
}
UserGroupInformation ugi =
UserGroupInformation.createRemoteUser(appAttemptId.toString());
Token<AMRMTokenIdentifier> token = rm.getRMContext().getRMApps()
.get(appAttemptId.getApplicationId())
.getRMAppAttempt(appAttemptId).getAMRMToken();
ugi.addTokenIdentifier(token.decodeIdentifier());
AllocateResponse response = ugi.doAs(
new PrivilegedExceptionAction<AllocateResponse>() {
@Override
public AllocateResponse run() throws Exception {
return rm.getApplicationMasterService().allocate(request);
}
});
if (response != null) {
responseQueue.put(response);
}
}
@Override
protected void checkStop() {
if (isFinished) {
super.setEndTime(System.currentTimeMillis());
}
}
@Override
public void lastStep() {
super.lastStep();
// clear data structures
allMaps.clear();
allReduces.clear();
assignedMaps.clear();
assignedReduces.clear();
pendingFailedMaps.clear();
pendingFailedReduces.clear();
pendingMaps.clear();
pendingReduces.clear();
scheduledMaps.clear();
scheduledReduces.clear();
responseQueue.clear();
}
}