浅谈踩坑记之一个Java线程池参数，差点引起线上事故（下）

@EnableAsync
@Configuration
@Slf4j
public class ThreadPoolConfig {
    private static final int corePoolSize = 100;             // 核心线程数（默认线程数）
    private static final int maxPoolSize = 400;             // 最大线程数
    private static final int keepAliveTime = 60;            // 允许线程空闲时间（单位：默认为秒）
    private static final int queueCapacity = 0;         // 缓冲队列数
    private static final String threadNamePrefix = "Async-Service-"; // 线程池名前缀
    @Bean("taskExecutor") 
    public ThreadPoolTaskExecutor getAsyncExecutor(){
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveTime);
        executor.setThreadNamePrefix(threadNamePrefix);
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());
        // 初始化
        executor.initialize();
        return executor;
    }
}

corethreads: 150
threads: 800
threadpool: cached
queues: 10

org.apache.dubbo.remoting.RemotingException("Server side(IP,20880) thread pool is exhausted, detail msg:Thread pool is EXHAUSTED! Thread Name: DubboServerHandler-IP:20880, Pool Size: 800 (active: 4, core: 300, max: 800, largest: 800), Task: 4101304 (completed: 4101301), Executor status:(isShutdown:false, isTerminated:false, isTerminating:false), in dubbo://IP:20880!"

 queues == 0 ? new SynchronousQueue<Runnable>() :
                        (queues < 0 ? new LinkedBlockingQueue<Runnable>()
                                : new LinkedBlockingQueue<Runnable>(queues))

package com.bytearch.fast.cloud;
import java.util.concurrent.*;
public class TestThreadPool {
    public final static int queueSize = 10;
    public static void main(String[] args) {
        ExecutorService executorService = getThreadPool(queueSize);
        for (int i = 0; i < 100000; i++) {
            int finalI = i;
            try {
                executorService.execute(new Runnable() {
                    @Override
                    public void run() {
                        doSomething(finalI);
                    }
                });
            } catch (Exception e) {
                System.out.println("emsg:" + e.getMessage());
            }
            if (i % 20 == 0) {
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println("all done!");
        try {
            Thread.sleep(1000000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    public static ExecutorService getThreadPool(int queues) {
        int cores = 150;
        int threads = 800;
        int alive = 60 * 1000;
        return new ThreadPoolExecutor(cores, threads, alive, TimeUnit.MILLISECONDS,
                queues == 0 ? new SynchronousQueue<Runnable>() :
                        (queues < 0 ? new LinkedBlockingQueue<Runnable>()
                                : new LinkedBlockingQueue<Runnable>(queues)));
    }
    public static void doSomething(final int i) {
        try {
            Thread.sleep(5);
            System.out.println("thread:" + Thread.currentThread().getName() +  ", active:" + Thread.activeCount() + ", do:" + i);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

emsg:Task com.bytearch.fast.cloud.TestThreadPool$1@733aa9d8 rejected from java.util.concurrent.ThreadPoolExecutor@6615435c[Running, pool size = 800, active threads = 32, queued tasks = 9, completed tasks = 89755]
all done!