0004474: multiple webapp instances (not versioned) in 4.0.16

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Category

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

Platform

Status

closed

Projection

none

OS Version

ETA

none

Fixed in Version

4.0.17

Product Version

4.0.16

Product Build

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???

Steps To Reproduce

Additional Information

Attached Files

Relationships

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

Mantis 1.0.0rc3[^]

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