-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Saurav,
On 10/11/17 8:56 AM, Saurav Sarkar wrote: > I have got a basic question related to usage of Async servlet with > tomcat NIO connector. > > I want to use Async servlet with Non Block I/O as per servlet spec > https://docs.oracle.com/javaee/7/tutorial/servlets013.htm?lipi=urn%3Al i%3Apage%3Ad_flagship3_pulse_read%3BmL0Q5Y7ESTy4lpYPU%2Br77w%3D%3D > > Such that the http worker threads are released and the container > threads won't be sitting idle for I/O operations too. > > I am on Tomcat 7. As i understand the default tomcat connector > (BIO) is a blocking one and is on a thread per connection model. I > am not clear on whether using async Non Blocking I/o in servlets > won't suffice ? Won't the http worker threads be released here or > will it be held for the lifetime of the connection ? You can't effectively use BIO with async, at least not the way you actually want to use it. You should switch to NIO if you want to use servlet-async. > NIO connector will use request per threads or allocate threads > when processing is required .Will using NIO selector only release > the http worker threads if it is used in conjunction with > Asynchronous Non blocking I/O servlets ? That depends upon what you mean by "release" and, specifically, /when/ they are released. With the BIO connector, HTTP keepalives can tie-up a connector up to the keepAliveTimeout without accomplishing any useful work. This happens ALL THE TIME -- clients make a keepalive request and then never bother to close their connection cleanly. So the server wastes thread-time waiting for another request which never comes. The NIO connector (and APR connector) puts the connection into an I/O selector and waits for an interrupt from the OS/JVM while the request-processor thread goes back into the thread pool. When doing servlet-async and Websocket, things get ... more complicated. - -chris -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAlngMdMACgkQHPApP6U8 pFjwiw//UeN1W08AId+OcVUc2ZMnzZZZJLnu6RhY+yO50avZx3PhvzGxrHZTfBRD FFRJRBOCo/1TFacQxUjFXr4Q9tkdcABcN6cVj6f7tJh4S55/jxEeHkg8UGNQe31V 9N6GpUIzRq/WuDFJQRfwJnpOQRVs+DXVIrWWD8RqQ6BooHkt2mUl0u7oYRxcLcQ1 SD8tEK1O1LiJ1gwNWs5Cx1d7s/6mE2tSxKvKH94yr1MvfdChj51vrc7JI3+gfdwa V6FWItVoIuG4rNqFsthaKiXswvqyGC+gzPG9Jn7aEh0Xd2rzCAX+E9GMM7aKMHEL QOu+gFm897eRhL4ueBDBxl3MY1R/xD5JEIDeuO82gbmM8xcm7sSqWs2TOazFC5xs JOdo52xS38RHgRf+eSQ7+KMmZYznYbUscJMokTHYWU/twC7tSzmO4rYB2EEPNTEB czNyxv4MbWCaQjOunYeFMp2byEFmLyLu2e+jBDPdmPsjMgpduQ35E4spfaYRaCc0 5J8HRaQ4s0amy6b9s/j95pFvYVRlaPRN7ebNMtT/BhoakKXk+ugpNsnCI21zChAJ aKOdPzb5RU90Qm7mDXeRFqggfI5S1w507WlQZp6bZG6WZ2oz0ykF87WHHQP8C5F4 AvSvTe32zDpmCt0rS7+VgTGBNL/VGLv8r8S/0eLjldA0LDASkTA= =vSrb -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
