0
您好我想运行下面的代码,并且在执行器被终止后,我期待剩余任务的计数为0,但由于某种原因,当它满足以下条件时它超过100。执行器没有完成所有的任务
while(executor.isTerminated()) {
System.out.println("Total Task Remaining : " + ExecutorServiceExample.task.size());
System.out.println("*** Executor Terminated ***");
break;
}
Code Snippet。
package test;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class ExecutorServiceExample {
public static volatile Set<String> task = new HashSet<String>();
public static void main(String args[]) {
ExecutorService executor = Executors.newFixedThreadPool(2000);
for (int i = 0; i < 10000; i++) {
String name = "task#" + i;
task.add(name);
Runnable runner = new TaskPrint(name);
executor.execute(runner);
}
try {
executor.shutdown();
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
if (executor.isTerminated()) {
System.out.println("Total Task Remaining : " + ExecutorServiceExample.task.size());
System.out.println("*** Executor Terminated ***");
}
} catch (InterruptedException ignored) {
}
}
}
class TaskPrint implements Runnable {
private final String name;
public TaskPrint(String name) {
this.name = name;
}
public void run() {
ExecutorServiceExample.task.remove(name);
}
}
基于任务数量的结果有些奇怪。
100个任务的输出。
Total Task Remaining : 0
*** Executor Terminated ***
1000个任务的输出。
Total Task Remaining : 0
*** Executor Terminated ***
10000个任务的输出。
Total Task Remaining : -27
*** Executor Terminated ***
100000个任务的输出。
Total Task Remaining : 1205
*** Executor Terminated ***
一个synchronizedSet我不知道,但我知道,创建2个数千个线程与'Executors.newFixedThreadPool(2000年);'是自找麻烦... –
我不知道为什么因为HashSet不同步... –
@ G.Demecki我将它改为'ExecutorService executor = Executors.newFixedThreadPool(10);'现在剩余的总任务多于2000 –