On 26 March 2013 20:44, Jacob Lloyd <jacob....@gmail.com> wrote: > ------------------------------------------- > ISSUE DETAILS: > ------------------------------------------- > > My Tomcat 7 web app is fronted by a HTTP gateway (apache traffic server) > that provides caching\OAuth authentication etc. > > My REST\JSON API web app hosted in Tomcat 7 is retrieving database data and > serializing into JSON in the HTTP response. > > Most of the API calls customers make will retrieve a few hundred or a few > thousand rows which takes the server-side sub-second time and a couple of > seconds of network time. > > ------------ > PROBLEM: > ------------ > > There a few customers that need to make API calls that will retrieve a > couple of million rows serialized into JSON. > > These operations on the Tomcat 7 web app server-side, as expected, takes > 30-32 seconds. > > The issue is that the HTTP gateway (apache traffic server) is configured > with a global 30 second timeout which results in a timeout to the caller. > > Since I can't change this on the HTTP gateway, is there a way to send some > kind of TCP traffic to the HTTP gateway so it knows I'm still working? > > In looking at the connection under wireshark, it appears that Tomcat is > sending 502's because it never sent the FIN ACK, just an ACK to the HTTP > gateway. > > So Tomcat thinks the connection was open but the HTTP gateway (apache > traffic server) was done with it and just kept re-sending it's attempts to > reconnect. > > The stack of the web app hosted on Tomcat is: Apache CXF\Spring > > Any thoughts? > > ------------------------------------------- > Environment Info: > ------------------------------------------- > > Apache Tomcat: 7.0.33 > JVM: 1.6.0_37-b06 > JVM Vendor: Sun Microsystems Inc. > OS Name: Linux > OS Version: 2.6.32-279.el6.x86_64 > OS Architecture: amd64 > > Thanks, > Jacob
If you cannot control the timeout on the gateway server, nor reject requests that are not going to process in time, you might need to re-design your application to partition your response and reply back with a 206. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
