On Thu, 2014-01-30 at 13:07 +0100, Antoine Bonavita wrote: > Hello, > > I'm investigating an issue with our application (it intermittently stops > responding and we have to restart it). > > To give you a bit of background, it's a Tomcat7 application using > AsyncServlet and connecting to a number of other servers using HTTP as a > transport layer (for each HTTP request we get, we do 3 to 5 requests in > parallel to the upstream servers). Of course, we are using > http-components and more specifically http-async-client for the > communication to the upstream servers. > We are using: httpasynclient-4.0, httpclient-4.3.2, httpcore-4.3.1 and > httpcore-nio-4.3.2-20140116 (that's 4.3.2 with the fix for > https://issues.apache.org/jira/browse/HTTPCORE-370). > > My current investigation led me to enable logging at the connection > level and look at some of the connections. > > You will find attached the logs for a specific connection > (http-outgoing-601). There are two things that "look wierd" to me but > I'm not at all an expert so I would like to have your point of view: > * The connection is leased at 18:54:52,988, then again at 18:54:56,660. > After that it is released at 18:54:56,682 and at 18:55:00,394. To me, > one http-outgoing should be released before it can be leased again. Am I > missing something ?
Connection pool logging takes place outside of the pool lock. Under certain conditions the connection being released can get grabbed almost immediately by another thread. As a result log entries may look mixed up. However, as you can see the second 'release' entry is preceded by 'west.tubemogul.com:80] can be kept alive indefinitely' entry. This basically means the connection was in the process of being released at the same time. > * At 18:55:00,384, I see a "-1 bytes read" which seems to trigger a > close. What could be causing this ? > The opposite endpoint closing the connection on its end, for whatever reason. > In this case the log is really short but some connection might do > hundreds of requests before hitting this situation. > I would venture to say the logs look pretty ordinary to me. Hope this helps. Oleg --------------------------------------------------------------------- To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org For additional commands, e-mail: httpclient-users-h...@hc.apache.org
