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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import com.google.inject.Inject;
import com.yahoo.container.protect.ProcessTerminator;
import com.google.common.util.concurrent.ForwardingExecutorService;
import com.yahoo.component.AbstractComponent;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.container.di.componentgraph.Provider;
import com.yahoo.jdisc.Metric;
/**
* A configurable thread pool provider. This provides the worker threads used for normal request processing.
* Request an Executor injected in your component constructor if you want to use it.
*
* @author Steinar Knutsen
* @author baldersheim
* @author bratseth
*/
public class ThreadPoolProvider extends AbstractComponent implements Provider<Executor> {
private final ExecutorServiceWrapper threadpool;
@Inject
public ThreadPoolProvider(ThreadpoolConfig threadpoolConfig, Metric metric) {
this(threadpoolConfig, metric, new ProcessTerminator());
}
public ThreadPoolProvider(ThreadpoolConfig threadpoolConfig, Metric metric, ProcessTerminator processTerminator) {
WorkerCompletionTimingThreadPoolExecutor executor =
new WorkerCompletionTimingThreadPoolExecutor(threadpoolConfig.maxthreads(),
threadpoolConfig.maxthreads(),
0L, TimeUnit.SECONDS,
new SynchronousQueue<>(false),
ThreadFactoryFactory.getThreadFactory("threadpool"));
// Prestart needed, if not all threads will be created by the fist N tasks and hence they might also
// get the dreaded thread locals initialized even if they will never run.
// That counters what we we want to achieve with the Q that will prefer thread locality.
executor.prestartAllCoreThreads();
threadpool = new ExecutorServiceWrapper(executor, metric, processTerminator,
threadpoolConfig.maxThreadExecutionTimeSeconds() * 1000L);
}
/**
* Get the Executor provided by this class. This Executor will by default
* also be used for search queries and processing requests.
*
* @return a possibly shared executor
*/
@Override
public Executor get() { return threadpool; }
/**
* Shutdown the thread pool, give a grace period of 1 second before forcibly
* shutting down all worker threads.
*/
@Override
public void deconstruct() {
boolean terminated;
super.deconstruct();
threadpool.shutdown();
try {
terminated = threadpool.awaitTermination(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return;
}
if (!terminated) {
threadpool.shutdownNow();
}
}
/**
* A service executor wrapper which emits metrics and
* shuts down the vm when no workers are available for too long to avoid containers lingering in a blocked state.
*/
private final static class ExecutorServiceWrapper extends ForwardingExecutorService {
private final WorkerCompletionTimingThreadPoolExecutor wrapped;
private final Metric metric;
private final ProcessTerminator processTerminator;
private final long maxThreadExecutionTimeMillis;
private final Thread metricReporter;
private final AtomicBoolean closed = new AtomicBoolean(false);
private ExecutorServiceWrapper(WorkerCompletionTimingThreadPoolExecutor wrapped,
Metric metric, ProcessTerminator processTerminator,
long maxThreadExecutionTimeMillis) {
this.wrapped = wrapped;
this.metric = metric;
this.processTerminator = processTerminator;
this.maxThreadExecutionTimeMillis = maxThreadExecutionTimeMillis;
metric.set(MetricNames.THREAD_POOL_SIZE, wrapped.getPoolSize(), null);
metric.set(MetricNames.ACTIVE_THREADS, wrapped.getActiveCount(), null);
metric.add(MetricNames.REJECTED_REQUEST, 0, null);
metricReporter = new Thread(this::reportMetrics);
metricReporter.setDaemon(true);
metricReporter.start();
}
private final void reportMetrics() {
try {
while (!closed.get()) {
metric.set(MetricNames.THREAD_POOL_SIZE, wrapped.getPoolSize(), null);
metric.set(MetricNames.ACTIVE_THREADS, wrapped.getActiveCount(), null);
Thread.sleep(100);
}
} catch (InterruptedException e) { }
}
@Override
public void shutdown() {
super.shutdown();
closed.set(true);
}
/**
* Tracks all instances of RejectedExecutionException.
* ThreadPoolProvider returns an executor, so external uses will not
* have access to the methods declared by ExecutorService.
* (execute(Runnable) is declared by Executor.)
*/
@Override
public void execute(Runnable command) {
try {
super.execute(command);
} catch (RejectedExecutionException e) {
metric.add(MetricNames.REJECTED_REQUEST, 1, null);
long timeSinceLastReturnedThreadMillis = System.currentTimeMillis() - wrapped.lastThreadReturnTimeMillis;
if (timeSinceLastReturnedThreadMillis > maxThreadExecutionTimeMillis)
processTerminator.logAndDie("No worker threads have been available for " +
timeSinceLastReturnedThreadMillis + " ms. Shutting down.", true);
throw e;
}
}
@Override
protected ExecutorService delegate() { return wrapped; }
private static final class MetricNames {
private static final String REJECTED_REQUEST = "serverRejectedRequests";
private static final String THREAD_POOL_SIZE = "serverThreadPoolSize";
private static final String ACTIVE_THREADS = "serverActiveThreads";
}
}
/** A thread pool executor which maintains the last time a worker completed */
private final static class WorkerCompletionTimingThreadPoolExecutor extends ThreadPoolExecutor {
volatile long lastThreadReturnTimeMillis = System.currentTimeMillis();
private final AtomicLong startedCount = new AtomicLong(0);
private final AtomicLong completedCount = new AtomicLong(0);
public WorkerCompletionTimingThreadPoolExecutor(int corePoolSize,
int maximumPoolSize,
long keepAliveTime,
TimeUnit unit,
BlockingQueue<Runnable> workQueue,
ThreadFactory threadFactory) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
}
@Override
protected void beforeExecute(Thread t, Runnable r) {
super.beforeExecute(t, r);
startedCount.incrementAndGet();
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
lastThreadReturnTimeMillis = System.currentTimeMillis();
completedCount.incrementAndGet();
}
@Override
public int getActiveCount() {
return (int)(startedCount.get() - completedCount.get());
}
}
}
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