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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler.threadpool;
import com.google.common.util.concurrent.ForwardingExecutorService;
import com.yahoo.container.protect.ProcessTerminator;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* 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.
* Package private for testing
*
* @author Steinar Knutsen
* @author baldersheim
* @author bratseth
*/
class ExecutorServiceWrapper extends ForwardingExecutorService {
private final WorkerCompletionTimingThreadPoolExecutor wrapped;
private final ThreadPoolMetric metric;
private final ProcessTerminator processTerminator;
private final long maxThreadExecutionTimeMillis;
private final int queueCapacity;
private final Thread metricReporter;
private final boolean threadPoolIsOnlyQ;
private final AtomicBoolean closed = new AtomicBoolean(false);
ExecutorServiceWrapper(WorkerCompletionTimingThreadPoolExecutor wrapped,
ThreadPoolMetric metric,
ProcessTerminator processTerminator,
long maxThreadExecutionTimeMillis,
String name) {
this.wrapped = wrapped;
this.metric = metric;
this.processTerminator = processTerminator;
this.maxThreadExecutionTimeMillis = maxThreadExecutionTimeMillis;
int maxQueueCapacity = wrapped.getQueue().remainingCapacity() + wrapped.getQueue().size();
this.threadPoolIsOnlyQ = (maxQueueCapacity == 0);
this.queueCapacity = threadPoolIsOnlyQ
? wrapped.getMaximumPoolSize()
: maxQueueCapacity;
reportMetrics();
metricReporter = new Thread(this::reportMetricsRegularly);
metricReporter.setName(name + "-threadpool-metric-reporter");
metricReporter.start();
}
private void reportMetrics() {
int activeThreads = wrapped.getActiveCount();
metric.reportThreadPoolSize(wrapped.getPoolSize());
metric.reportMaxAllowedThreadPoolSize(wrapped.getMaximumPoolSize());
metric.reportActiveThreads(activeThreads);
int queueSize = threadPoolIsOnlyQ ? activeThreads : wrapped.getQueue().size();
metric.reportWorkQueueSize(queueSize);
metric.reportWorkQueueCapacity(queueCapacity);
}
private void reportMetricsRegularly() {
while (timeToReportMetricsAgain(100)) {
reportMetrics();
}
}
private boolean timeToReportMetricsAgain(int timeoutMS) {
synchronized (closed) {
if (!closed.get()) {
try {
closed.wait(timeoutMS);
} catch (InterruptedException e) {
return false;
}
}
}
return !closed.get();
}
@Override
public void shutdown() {
synchronized (closed) {
closed.set(true);
closed.notify();
}
try {
metricReporter.join();
} catch (InterruptedException e) {}
super.shutdown();
}
/**
* Tracks all instances of {@link RejectedExecutionException}.
* {@link ContainerThreadPool} returns an executor, so external uses will not
* have access to the methods declared by {@link ExecutorService}.
* ({@link Executor#execute(Runnable)} is declared by {@link Executor}.)
*/
@Override
public void execute(Runnable command) {
try {
super.execute(command);
} catch (RejectedExecutionException e) {
metric.reportRejectRequest();
long timeSinceLastReturnedThreadMillis = System.currentTimeMillis() - wrapped.lastThreadAssignmentTimeMillis;
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; }
}
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