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io.druid.indexing.overlord.ThreadPoolTaskRunner Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.indexing.overlord;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.inject.Inject;
import com.metamx.emitter.EmittingLogger;
import com.metamx.emitter.service.ServiceEmitter;
import com.metamx.emitter.service.ServiceMetricEvent;
import io.druid.concurrent.Execs;
import io.druid.concurrent.TaskThreadPriority;
import io.druid.guice.annotations.Self;
import io.druid.indexing.common.TaskLocation;
import io.druid.indexing.common.TaskStatus;
import io.druid.indexing.common.TaskToolbox;
import io.druid.indexing.common.TaskToolboxFactory;
import io.druid.indexing.common.config.TaskConfig;
import io.druid.indexing.common.task.Task;
import io.druid.indexing.overlord.autoscaling.ScalingStats;
import io.druid.java.util.common.ISE;
import io.druid.java.util.common.Pair;
import io.druid.java.util.common.lifecycle.LifecycleStop;
import io.druid.query.NoopQueryRunner;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QuerySegmentWalker;
import io.druid.query.SegmentDescriptor;
import io.druid.server.DruidNode;
import org.joda.time.DateTime;
import org.joda.time.Interval;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
/**
* Runs tasks in a JVM thread using an ExecutorService.
*/
public class ThreadPoolTaskRunner implements TaskRunner, QuerySegmentWalker
{
private static final EmittingLogger log = new EmittingLogger(ThreadPoolTaskRunner.class);
private final TaskToolboxFactory toolboxFactory;
private final TaskConfig taskConfig;
private final ConcurrentMap exec = new ConcurrentHashMap<>();
private final Set runningItems = new ConcurrentSkipListSet<>(
ThreadPoolTaskRunnerWorkItem.COMPARATOR
);
private final CopyOnWriteArrayList> listeners = new CopyOnWriteArrayList<>();
private final ServiceEmitter emitter;
private final TaskLocation location;
private volatile boolean stopping = false;
@Inject
public ThreadPoolTaskRunner(
TaskToolboxFactory toolboxFactory,
TaskConfig taskConfig,
ServiceEmitter emitter,
@Self DruidNode node
)
{
this.toolboxFactory = Preconditions.checkNotNull(toolboxFactory, "toolboxFactory");
this.taskConfig = taskConfig;
this.emitter = Preconditions.checkNotNull(emitter, "emitter");
this.location = TaskLocation.create(node.getHost(), node.getPort());
}
@Override
public List>> restore()
{
return ImmutableList.of();
}
@Override
public void registerListener(TaskRunnerListener listener, Executor executor)
{
for (Pair pair : listeners) {
if (pair.lhs.getListenerId().equals(listener.getListenerId())) {
throw new ISE("Listener [%s] already registered", listener.getListenerId());
}
}
final Pair listenerPair = Pair.of(listener, executor);
// Location never changes for an existing task, so it's ok to add the listener first and then issue bootstrap
// callbacks without any special synchronization.
listeners.add(listenerPair);
log.info("Registered listener [%s]", listener.getListenerId());
for (ThreadPoolTaskRunnerWorkItem item : runningItems) {
TaskRunnerUtils.notifyLocationChanged(ImmutableList.of(listenerPair), item.getTaskId(), item.getLocation());
}
}
@Override
public void unregisterListener(String listenerId)
{
for (Pair pair : listeners) {
if (pair.lhs.getListenerId().equals(listenerId)) {
listeners.remove(pair);
log.info("Unregistered listener [%s]", listenerId);
return;
}
}
}
private static ListeningExecutorService buildExecutorService(int priority)
{
return MoreExecutors.listeningDecorator(
Execs.singleThreaded(
"task-runner-%d-priority-" + priority,
TaskThreadPriority.getThreadPriorityFromTaskPriority(priority)
)
);
}
@Override
@LifecycleStop
public void stop()
{
stopping = true;
for (Map.Entry entry : exec.entrySet()) {
try {
entry.getValue().shutdown();
}
catch (SecurityException ex) {
log.wtf(ex, "I can't control my own threads!");
}
}
for (ThreadPoolTaskRunnerWorkItem item : runningItems) {
final Task task = item.getTask();
final long start = System.currentTimeMillis();
final boolean graceful;
final long elapsed;
boolean error = false;
if (taskConfig.isRestoreTasksOnRestart() && task.canRestore()) {
// Attempt graceful shutdown.
graceful = true;
log.info("Starting graceful shutdown of task[%s].", task.getId());
try {
task.stopGracefully();
final TaskStatus taskStatus = item.getResult().get(
new Interval(new DateTime(start), taskConfig.getGracefulShutdownTimeout()).toDurationMillis(),
TimeUnit.MILLISECONDS
);
// Ignore status, it doesn't matter for graceful shutdowns.
log.info(
"Graceful shutdown of task[%s] finished in %,dms.",
task.getId(),
System.currentTimeMillis() - start
);
TaskRunnerUtils.notifyStatusChanged(listeners, task.getId(), taskStatus);
}
catch (Exception e) {
log.makeAlert(e, "Graceful task shutdown failed: %s", task.getDataSource())
.addData("taskId", task.getId())
.addData("dataSource", task.getDataSource())
.emit();
log.warn(e, "Graceful shutdown of task[%s] aborted with exception.", task.getId());
error = true;
TaskRunnerUtils.notifyStatusChanged(listeners, task.getId(), TaskStatus.failure(task.getId()));
}
} else {
graceful = false;
TaskRunnerUtils.notifyStatusChanged(listeners, task.getId(), TaskStatus.failure(task.getId()));
}
elapsed = System.currentTimeMillis() - start;
final ServiceMetricEvent.Builder metricBuilder = ServiceMetricEvent
.builder()
.setDimension("task", task.getId())
.setDimension("dataSource", task.getDataSource())
.setDimension("graceful", String.valueOf(graceful))
.setDimension("error", String.valueOf(error));
emitter.emit(metricBuilder.build("task/interrupt/count", 1L));
emitter.emit(metricBuilder.build("task/interrupt/elapsed", elapsed));
}
// Ok, now interrupt everything.
for (Map.Entry entry : exec.entrySet()) {
try {
entry.getValue().shutdownNow();
}
catch (SecurityException ex) {
log.wtf(ex, "I can't control my own threads!");
}
}
}
@Override
public ListenableFuture run(final Task task)
{
final TaskToolbox toolbox = toolboxFactory.build(task);
final Object taskPriorityObj = task.getContextValue(TaskThreadPriority.CONTEXT_KEY);
int taskPriority = 0;
if (taskPriorityObj != null) {
if (taskPriorityObj instanceof Number) {
taskPriority = ((Number) taskPriorityObj).intValue();
} else if (taskPriorityObj instanceof String) {
try {
taskPriority = Integer.parseInt(taskPriorityObj.toString());
}
catch (NumberFormatException e) {
log.error(e, "Error parsing task priority [%s] for task [%s]", taskPriorityObj, task.getId());
}
}
}
// Ensure an executor for that priority exists
if (!exec.containsKey(taskPriority)) {
final ListeningExecutorService executorService = buildExecutorService(taskPriority);
if (exec.putIfAbsent(taskPriority, executorService) != null) {
// favor prior service
executorService.shutdownNow();
}
}
final ListenableFuture statusFuture = exec.get(taskPriority)
.submit(new ThreadPoolTaskRunnerCallable(
task,
location,
toolbox
));
final ThreadPoolTaskRunnerWorkItem taskRunnerWorkItem = new ThreadPoolTaskRunnerWorkItem(
task,
location,
statusFuture
);
runningItems.add(taskRunnerWorkItem);
Futures.addCallback(
statusFuture, new FutureCallback()
{
@Override
public void onSuccess(TaskStatus result)
{
runningItems.remove(taskRunnerWorkItem);
}
@Override
public void onFailure(Throwable t)
{
runningItems.remove(taskRunnerWorkItem);
}
}
);
return statusFuture;
}
@Override
public void shutdown(final String taskid)
{
for (final TaskRunnerWorkItem runningItem : runningItems) {
if (runningItem.getTaskId().equals(taskid)) {
runningItem.getResult().cancel(true);
}
}
}
@Override
public Collection getRunningTasks()
{
return ImmutableList.copyOf(runningItems);
}
@Override
public Collection getPendingTasks()
{
return ImmutableList.of();
}
@Override
public Collection getKnownTasks()
{
return ImmutableList.copyOf(runningItems);
}
@Override
public Optional getScalingStats()
{
return Optional.absent();
}
@Override
public void start()
{
// No state startup required
}
@Override
public QueryRunner getQueryRunnerForIntervals(Query query, Iterable intervals)
{
return getQueryRunnerImpl(query);
}
@Override
public QueryRunner getQueryRunnerForSegments(Query query, Iterable specs)
{
return getQueryRunnerImpl(query);
}
private QueryRunner getQueryRunnerImpl(Query query)
{
QueryRunner queryRunner = null;
final String queryDataSource = Iterables.getOnlyElement(query.getDataSource().getNames());
for (final ThreadPoolTaskRunnerWorkItem taskRunnerWorkItem : ImmutableList.copyOf(runningItems)) {
final Task task = taskRunnerWorkItem.getTask();
if (task.getDataSource().equals(queryDataSource)) {
final QueryRunner taskQueryRunner = task.getQueryRunner(query);
if (taskQueryRunner != null) {
if (queryRunner == null) {
queryRunner = taskQueryRunner;
} else {
log.makeAlert("Found too many query runners for datasource")
.addData("dataSource", queryDataSource)
.emit();
}
}
}
}
return queryRunner == null ? new NoopQueryRunner() : queryRunner;
}
private static class ThreadPoolTaskRunnerWorkItem extends TaskRunnerWorkItem
{
private static final Comparator COMPARATOR = new Comparator()
{
@Override
public int compare(
ThreadPoolTaskRunnerWorkItem lhs,
ThreadPoolTaskRunnerWorkItem rhs
)
{
return lhs.getTaskId().compareTo(rhs.getTaskId());
}
};
private final Task task;
private final TaskLocation location;
private ThreadPoolTaskRunnerWorkItem(
Task task,
TaskLocation location,
ListenableFuture result
)
{
super(task.getId(), result);
this.task = task;
this.location = location;
}
public Task getTask()
{
return task;
}
@Override
public TaskLocation getLocation()
{
return location;
}
}
private class ThreadPoolTaskRunnerCallable implements Callable
{
private final Task task;
private final TaskLocation location;
private final TaskToolbox toolbox;
public ThreadPoolTaskRunnerCallable(Task task, TaskLocation location, TaskToolbox toolbox)
{
this.task = task;
this.location = location;
this.toolbox = toolbox;
}
@Override
public TaskStatus call()
{
final long startTime = System.currentTimeMillis();
TaskStatus status;
try {
log.info("Running task: %s", task.getId());
TaskRunnerUtils.notifyLocationChanged(
listeners,
task.getId(),
location
);
TaskRunnerUtils.notifyStatusChanged(listeners, task.getId(), TaskStatus.running(task.getId()));
status = task.run(toolbox);
}
catch (InterruptedException e) {
// Don't reset the interrupt flag of the thread, as we do want to continue to the end of this callable.
if (stopping) {
// Tasks may interrupt their own run threads to stop themselves gracefully; don't be too scary about this.
log.debug(e, "Interrupted while running task[%s] during graceful shutdown.", task);
} else {
// Not stopping, this is definitely unexpected.
log.warn(e, "Interrupted while running task[%s]", task);
}
status = TaskStatus.failure(task.getId());
}
catch (Exception e) {
log.error(e, "Exception while running task[%s]", task);
status = TaskStatus.failure(task.getId());
}
catch (Throwable t) {
log.error(t, "Uncaught Throwable while running task[%s]", task);
throw t;
}
status = status.withDuration(System.currentTimeMillis() - startTime);
TaskRunnerUtils.notifyStatusChanged(listeners, task.getId(), status);
return status;
}
}
}
