Vyacheslav Trainin <vyacheslav.trai...@playtech.com> wrote:
>I reproduced it on: > - tomcat-7.0.23 and 7.0.25 > - java 64 bit 1.6.0_18 and 1.6.0_29 > - Linux CentOS release 5.6 (Final) 64 bit One one other question - which connector were you using? BIO, NIO, or APR/native? HTTP or AJP? With that information it looks like you have enough here to open a bug report in Bugzilla. Mark > > > >-----Original Message----- >From: Pid [mailto:p...@pidster.com] >Sent: Monday, April 09, 2012 8:37 PM >To: Tomcat Users List >Subject: Re: tomcat asynchronous invocation problem > >On 09/04/2012 13:53, Vyacheslav Trainin wrote: >> Hi, >> >> >> >> We encountered a problem during asynchronous operations (tomcat 7 >with >> servlet 3). > >Exactly which version of Tomcat 7.0? >Same for Java version? >Same for OS version(s)? > > >p > > >> _Description: _ >> >> One client continuously sends post requests to the server. On the >> server side for each request created AsyncContext with timeout 20 >seconds: >> >> AsyncContextasyncContext = req.startAsync(req, resp); >> >> asyncContext.setTimeout(20000); >> >> As expected after approximately 20 sec the requests are completed. >> Then another client also begins to send requests to the server but in > >> this case they are explicitly completed after 500 milliseconds. >> Something like this: >> >> AsyncContextasyncContext = req.startAsync(req, resp); >> >> asyncContext.setTimeout(20000); >> >> >> >> *try*{ >> >> Thread./sleep/(500); >> >> } *catch*(Exception e) { >> >> } >> >> >> >> asyncContext.complete(); >> >> >> >> The problem is that after running the second client all the requested > >> waiting for timeout (from the first client) are stuck and not >released >> (onTimeout method of AsyncEvent is not called) until the second >client >> stops sending requests. >> >> It looks like the problem occurs on Linux but not on Windows. >> >> >> >> Below is a simple test that may help to reproduce this issue. The >> following servlet accepts URL parameter "complete". >> >> When "complete=1" the request will be completed after 500ms. >> >> Otherwise the request will wait till timeout (20 seconds). >> >> >> >> Run client that periodically sends requests to /servlet?complete=0. >(I >> have tested it with 10 parallel threads that run in a loop) >> >> Then run another client that periodically sends requests to >> /servlet?complete=1 (This client can use only a single thread) >> >> See that the first client does not receive any responses while the >> second client is running. >> >> >> >> >> >> public class WebTestServlet extends HttpServlet { >> >> private static final Logger LOG = >> LoggerFactory.getLogger(WebTestServlet.class); >> >> >> >> @Override >> >> protected void service(final HttpServletRequest req, final >> HttpServletResponse resp) throws ServletException, IOException { >> >> LOG.debug("Received request: {}", req); >> >> final long startTime = System.currentTimeMillis(); >> >> String isComplete = req.getParameter("complete"); >> >> >> >> AsyncContext asyncContext = req.startAsync(req, resp); >> >> asyncContext.setTimeout(20000); >> >> asyncContext.addListener(new AsyncListener() { >> >> public void onTimeout(AsyncEvent event) throws >IOException >> { >> >> long duration = System.currentTimeMillis() - >> startTime; >> >> LOG.debug("Async Timeout. Request: {}. Waiting time: >> {}", event.getSuppliedRequest(), duration); >> >> event.getAsyncContext().complete(); >> >> } >> >> >> >> public void onStartAsync(AsyncEvent event) throws >> IOException { >> >> LOG.debug("Start async. Request: {}", >> event.getSuppliedRequest()); >> >> } >> >> >> >> public void onError(AsyncEvent event) throws IOException >{ >> >> LOG.debug("Error occured. Request: {}. Error: {}", >> event.getSuppliedRequest(), event.getThrowable()); >> >> } >> >> >> >> public void onComplete(AsyncEvent event) throws >> IOException { >> >> long duration = System.currentTimeMillis() - >> startTime; >> >> LOG.debug("Async Complete. Request: {}. Request >> process >> time: {}", event.getSuppliedRequest(), duration); >> >> } >> >> }, req, resp); >> >> >> >> if ("1".equals(isComplete)) { >> >> try { >> >> Thread.sleep(500); >> >> } catch (Exception e) { >> >> } >> >> >> >> asyncContext.complete(); >> >> } >> >> } >> >> } >> >> >> >> Regards, >> >> Slava >> >> >> >> >> > > >-- > >[key:62590808] --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
