[mod_cluster-issues] [JBoss JIRA] Updated: (MODCLUSTER-220) Extra ENABLE-APP/REMOVE-APP event after failover
Radoslav Husar (JIRA)
jira-events at lists.jboss.org
Thu Aug 4 10:44:21 EDT 2011
[ https://issues.jboss.org/browse/MODCLUSTER-220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radoslav Husar updated MODCLUSTER-220:
--------------------------------------
Issue Type: Bug (was: Enhancement)
Description:
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}
was:
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}
Updating Issue Type to Bug as per comments.
> Extra ENABLE-APP/REMOVE-APP event after failover
> ------------------------------------------------
>
> Key: MODCLUSTER-220
> URL: https://issues.jboss.org/browse/MODCLUSTER-220
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.0.8, 1.0.10, MOD_CLUSTER_1_0_10_GA_CP01, 1.1.2.Final
> Environment: Deployment on Tomcat6
> Reporter: Radoslav Husar
> Assignee: Michal Babacek
> Fix For: MOD_CLUSTER_1_0_10_GA_CP02, 1.1.3.Final
>
>
> 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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