[jboss-jira] [JBoss JIRA] (WFLY-5731) PollSelectorImpl's FD leak for asyncServlet

[浩 陈 (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-5731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134003#comment-13134003 ] 

浩 陈 commented on WFLY-5731:
---------------------------

we have tried both wildfly9.0.2 and 10.0.CR4, it seems nothing changed. 
I think This leak's reason maybe that:
When the thread writing this big data, output writer writes go beyond it's buffer size, then it creates a PollSelectorImpl and wait until  this buffer available. After response Data writes successfully, this thread will be GCed by JVM, PollSelectorImpl also be GCed.
 PollSelectorImpl have create two FD but Never close them.

> PollSelectorImpl's FD leak for asyncServlet
> -------------------------------------------
>
>                 Key: WFLY-5731
>                 URL: https://issues.jboss.org/browse/WFLY-5731
>             Project: WildFly
>          Issue Type: Bug
>          Components: Web (Undertow)
>    Affects Versions: 8.1.0.Final
>         Environment: OS:Red Hat Enterprise Linux Server release 5.5 (Tikanga) 
> MW:wildfly-8.1.0.Final
> JDK:
> java version "1.7.0_25"
> Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
> Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)
>            Reporter: 浩 陈
>            Assignee: Stuart Douglas
>            Priority: Critical
>         Attachments: DemoServlet.java
>
>
> AsyncServlet doGet() like this: 
>     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws     ServletException, IOException {
> 		resp.setContentType("text/html;charset=UTF-8");
> 		AsyncContext ctx = req.startAsync();
> 		new Thread(new Executor(ctx)).start();
> 	}
> public class Executor implements Runnable {
> 		private AsyncContext ctx = null;
> 		public Executor(AsyncContext ctx) {
> 			this.ctx = ctx;
> 		}
> 		public void run() {
> 			try {
> 				char[] data = new char[1024 * 1024 * 1];
> 				PrintWriter out = ctx.getResponse().getWriter();
> 				out.write(data);
> 				out.flush();
> 				ctx.complete();
> 			} catch (Exception e) {
> 				e.printStackTrace();
> 			}
> 		}
> do request this Servlet some times , run linux cmd :
> lsof -p [JAVAPID]|grep pipe|wc -l
> this number increases by two every one request,but never decrease! when this number up to OS's open file limit everything is not OK.



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