[jboss-jira] [JBoss JIRA] (WFLY-4397) WildFly.8.1.0.Final's Asynchronous servlets cause connection leak
Wind Wild (JIRA)
issues at jboss.org
Mon Mar 2 06:45:51 EST 2015
[ https://issues.jboss.org/browse/WFLY-4397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045160#comment-13045160 ]
Wind Wild commented on WFLY-4397:
---------------------------------
My test project as following:
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(urlPatterns="/asyncDemoServlet",asyncSupported=true)
public class AsyncDemoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("进入Servlet的时间：" + new Date() + ".");
out.flush();
//在子线程中执行业务调用，并由其负责输出响应，主线程退出
AsyncContext ctx = request.startAsync();
new Thread(new Executor(ctx)).start();
out.println("结束Servlet的时间：" + new Date() + ".");
ctx.addListener(new AsyncListener() {
@Override
public void onComplete(AsyncEvent event) throws IOException {
System.out.println("请求处理完毕的时间："+new Date());
}
@Override
public void onError(AsyncEvent arg0) throws IOException {
// TODO Auto-generated method stub
}
@Override
public void onStartAsync(AsyncEvent arg0) throws IOException {
// TODO Auto-generated method stub
}
@Override
public void onTimeout(AsyncEvent arg0) throws IOException {
// TODO Auto-generated method stub
}
});
out.flush();
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
public class Executor implements Runnable {
private AsyncContext ctx = null;
public Executor(AsyncContext ctx){
this.ctx = ctx;
}
public void run(){
try {
//等待十秒钟，以模拟业务方法的执行
Thread.sleep(10000);
PrintWriter out = ctx.getResponse().getWriter();
out.println("业务处理完毕的时间：" + new Date() + ".");
out.flush();
ctx.complete();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
> WildFly.8.1.0.Final's Asynchronous servlets cause connection leak
> -----------------------------------------------------------------
>
> Key: WFLY-4397
> URL: https://issues.jboss.org/browse/WFLY-4397
> Project: WildFly
> Issue Type: Bug
> Components: Web (Undertow)
> Affects Versions: 8.1.0.Final, 8.2.0.Final, 9.0.0.Alpha1
> Environment: Java(TM) SE Runtime Environment (build 1.7.0_25)
> Reporter: Wind Wild
> Assignee: Stuart Douglas
>
> Recently, I used Asynchronous servlets and AsyncListeners on my project.But when it runs on WildFly.8.1.0.Final,a problem appeared as following:
>
> 2015-01-10 10:08:40,936 ERROR [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 2) JBAS015004: Caught exception writing deployment marker file /opt/jboss/standalone/deployments/OpenESBHttp_full_prd.war.isundeploying: java.io.FileNotFoundException: /opt/jboss/standalone/deployments/OpenESBHttp_full_prd.war.isundeploying (Too many open files)
> at java.io.FileOutputStream.open(Native Method) [rt.jar:1.7.0_25]
> at java.io.FileOutputStream.<init>(FileOutputStream.java:212) [rt.jar:1.7.0_25]
> at java.io.FileOutputStream.<init>(FileOutputStream.java:165) [rt.jar:1.7.0_25]
> at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.createMarkerFile(FileSystemDeploymentService.java:984) [wildfly-deployment-scanner-8.1.0.Final.jar:8.1.0.Final]
> at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.access$2800(FileSystemDeploymentService.java:83) [wildfly-deployment-scanner-8.1.0.Final.jar:8.1.0.Final]
> at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$ScannerTask.recordInProgress(FileSystemDeploymentService.java:1044) [wildfly-deployment-scanner-8.1.0.Final.jar:8.1.0.Final]
> at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService.scan(FileSystemDeploymentService.java:431) [wildfly-deployment-scanner-8.1.0.Final.jar:8.1.0.Final]
> at org.jboss.as.server.deployment.scanner.FileSystemDeploymentService$DeploymentScanRunnable.run(FileSystemDeploymentService.java:147) [wildfly-deployment-scanner-8.1.0.Final.jar:8.1.0.Final]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_25]
> at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351) [rt.jar:1.7.0_25]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178) [rt.jar:1.7.0_25]
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) [rt.jar:1.7.0_25]
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [rt.jar:1.7.0_25]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_25]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_25]
> at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_25]
> at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.1.Final.jar:2.1.1.Final]
>
> 2015-01-10 10:08:41,329 INFO [org.wildfly.extension.undertow] (MSC service thread 1-5) JBAS017535: Unregistered web context: /ServiceWeb
> 2015-01-10 10:08:41,481 INFO [net.sf.json.xml.XMLSerializer] (HttpServiceHandler-50543) Using default type string
> 2015-01-10 10:08:42,225 INFO [org.hibernate.validator.internal.util.Version] (MSC service thread 1-3)
> 2015-01-10 10:08:43,504 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) JBAS015877: Stopped deployment OpenESBHttp_full_prd.war (runtime-name: OpenESBHttp_full_prd.war) in 2373ms
>
> From this server log,we can see that there is "Too open many files" problem.and on the WildFly‘s manager console,we can see that my project was undeployed.When i used command "lsof -p pid | wc -l" to find the count of open file-hander, 50000 open file,because there were a lot of "can't identify protocol" as following:
> java 25625 jbossuser 460u sock 0,6 0t0 62184686 can't identify protocol
> java 25625 jbossuser 461u sock 0,6 0t0 62170175 can't identify protocol
> java 25625 jbossuser 462u sock 0,6 0t0 62159509 can't identify protocol
> java 25625 jbossuser 463u sock 0,6 0t0 62193366 can't identify protocol
> java 25625 jbossuser 464u sock 0,6 0t0 62181816 can't identify protocol
> java 25625 jbossuser 465u sock 0,6 0t0 62159028 can't identify protocol
> java 25625 jbossuser 466u sock 0,6 0t0 62181150 can't identify protocol
> java 25625 jbossuser 467u sock 0,6 0t0 62165298 can't identify protocol
> java 25625 jbossuser 468u sock 0,6 0t0 62181859 can't identify protocol
> java 25625 jbossuser 469u sock 0,6 0t0 62155350 can't identify protocol
> java 25625 jbossuser 470u sock 0,6 0t0 62184687 can't identify protocol
> java 25625 jbossuser 471u sock 0,6 0t0 62150063 can't identify protocol
> java 25625 jbossuser 472u IPv4 70228479 0t0 TCP lesbprdapp16:webcache->192.168.53.177:23420 (ESTABLISHED)
>
> So i know there maybe occur connection leak on WildFly, and i made a test as follow:
> I use apache's jmeter to test this project,i use 50 users to request it,then use "lsof -p pid | can't identify protocol | wc -l" to find is there have “can't identify protocol”,the number is 0.But when i stop the request,there appeared lots of "can't identify protocol",the same phenomenon appeared on wildfly-9.0.0.Alpha1 and wildfly-8.2.0.Final but not appeared on tomcat.So i'm doubt that this is wildfly's bug,Is there anyony encounter this problem and tell me how to solve it.
>
> Moreover, i found a issue is like above problem:
> [WFLY-3652] Network connection leak - JBoss Issue Tracker
>
> but don't think they are the same probem,because it say the problem alrendy was fixed in wildfly-9.0.0.Alpha1,but above problem wasn't fixed when i test my project on wildfly-9.0.0.Alpha1.
>
> Who can help me solve this problem? thanks!
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