Mantis - Resin
Viewing Issue Advanced Details
4474 minor always 04-04-11 10:23 04-05-11 12:43
closed 4.0.16  
none 4.0.17  
0004474: multiple webapp instances (not versioned) in 4.0.16
(rep by Mattias Jiderhamn)

While evaluating Resin 4.0.16 we are seeing something that makes me really concerned. It appears as if after a redeploy there can be two instances of our main app running.

I was made aware of this by noticing that timed servlets (<run-at ... />) were having concurrency issues and logging the same event twice within the same second.
This made me add some extra logging in a <load-on-startup/> servlet, and I can actually see that at some reploys, the same web app is initialized twice - in different, concurrent threads and different classloaders.
For example one instance may be initialized by Thread[http://*:8080-776,5,main] [^] and at the same time (give or take a few seconds) another one by Thread[resin-366,5,main].

I cannot deliberately recreate it by simply redeploying (which makes it less likely to be a configuration issue). But it happens about daily on our test server; possibly issuing requests on a session in the app while redeploying is a factor.

We are not using versioning.
dependency-check-interval is set to 20 seconds.
The "extra" app does not appear in the admin console.

How can we figure out what is going on here???

04-05-11 11:15