0004474: multiple webapp instances (not versioned) in 4.0.16

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Severity

Reproducibility

Date Submitted

Last Update

0004474

[Resin]

minor

always

04-04-11 10:23

04-05-11 12:43

Reporter

ferg

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

4.0.16

Summary

0004474: multiple webapp instances (not versioned) in 4.0.16

Description

(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???

Additional Information

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Notes
(0005152) ferg 04-05-11 11:15 edited on: 04-05-11 12:11	server/1d2j env/2011

Issue History
Date Modified	Username	Field	Change
04-04-11 10:23	ferg	New Issue
04-04-11 10:36	mate	Issue Monitored: mate
04-04-11 11:31	briandeng	Issue Monitored: briandeng
04-05-11 11:15	ferg	Note Added: 0005152
04-05-11 12:11	ferg	Note Edited: 0005152
04-05-11 12:43	ferg	Assigned To	=> ferg
04-05-11 12:43	ferg	Status	new => closed
04-05-11 12:43	ferg	Resolution	open => fixed
04-05-11 12:43	ferg	version	=> 4.0.16
04-05-11 12:43	ferg	Fixed in Version	=> 4.0.17

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