[mod_cluster-issues] [JBoss JIRA] Commented: (MODCLUSTER-220) Extra ENABLE-APP/REMOVE-APP event after failover

[Michal Babacek (JIRA)]

    [ https://issues.jboss.org/browse/MODCLUSTER-220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607822#comment-12607822 ] 

Michal Babacek commented on MODCLUSTER-220:
-------------------------------------------

Well...does it look like:
{noformat}
mod_manager.c(1988): manager_handler STATUS  OK
mod_manager.c(1432): manager_trans INFO (/)
mod_manager.c(1947): manager_handler INFO (/) processing: ""
mod_manager.c(1988): manager_handler INFO  OK
mod_manager.c(1432): manager_trans CONFIG (/)
mod_manager.c(1947): manager_handler CONFIG (/) processing: "JVMRoute=perf03&Port=8009&Host=10.16.88.181&Type=ajp&StickySessionForce=No&StickySessionRemove=Yes"
mod_manager.c(1988): manager_handler CONFIG  OK
mod_manager.c(1432): manager_trans ENABLE-APP (/)
mod_manager.c(1947): manager_handler ENABLE-APP (/) processing: "JVMRoute=perf03&Alias=localhost&Context=%2f"
mod_manager.c(1988): manager_handler ENABLE-APP  OK
mod_manager.c(1432): manager_trans REMOVE-APP (/)
mod_manager.c(1947): manager_handler REMOVE-APP (/) processing: "JVMRoute=perf03&Alias=localhost&Context=%2f"
mod_manager.c(1988): manager_handler REMOVE-APP  OK
mod_manager.c(1432): manager_trans STATUS (/)
mod_manager.c(1947): manager_handler STATUS (/) processing: "JVMRoute=perf03&Load=99"
{noformat}

*Reader's Digest:*
...
mod_manager.c(1947): manager_handler ENABLE-APP  \(/) processing: "JVMRoute=perf03&Alias=localhost&Context=%2f"
mod_manager.c(1947): manager_handler REMOVE-APP  \(/) processing: "JVMRoute=perf03&Alias=localhost&Context=%2f"
...

We are trying to narrow it down with [~jfclere]...


> Extra ENABLE-APP/REMOVE-APP event after failover
> ------------------------------------------------
>
>                 Key: MODCLUSTER-220
>                 URL: https://issues.jboss.org/browse/MODCLUSTER-220
>             Project: mod_cluster
>          Issue Type: Enhancement
>    Affects Versions: 1.0.8, 1.0.10
>         Environment: Deployment on Tomcat6
>            Reporter: Radoslav Husar
>            Assignee: Michal Babacek
>             Fix For: MOD_CLUSTER_1_0_10_GA_CP02
>
>
> Trivial thing: I think there is an extra REMOVE-APP event happening after fail-over. The test scenario is simple - start a node with 6 context, kill the node and reconnect. The apps are unchanged but 5 are remembered as were and one is removed and added back? Since they happen at the same time it looks like it happens uselessly and can cause race condition.
> {code}
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "INFO / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "CONFIG / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:18:34 +0200] "STATUS / HTTP/1.0" 200 58 "-" "ClusterListener/1.0"
> ...
> 127.0.0.1 - - [04/Apr/2011:19:19:03 +0200] "GET /SessionTest/SessionTestServlet? HTTP/1.1" 200 1 "-" "Jakarta Commons-HttpClient/3.1"
> ...
> 127.0.0.1 - - [04/Apr/2011:19:20:44 +0200] "INFO / HTTP/1.0" 200 575 "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:20:44 +0200] "CONFIG / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:20:44 +0200] "ENABLE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:20:44 +0200] "REMOVE-APP / HTTP/1.0" 200 - "-" "ClusterListener/1.0"
> 127.0.0.1 - - [04/Apr/2011:19:20:44 +0200] "STATUS / HTTP/1.0" 200 58 "-" "ClusterListener/1.0"
> {code}

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