[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-711) Using "connectorPort" property fails if multiple services are configured in Tomcat

[Radoslav Husar (Jira)]

    [ https://issues.redhat.com/browse/MODCLUSTER-711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971994#comment-13971994 ] 

Radoslav Husar edited comment on MODCLUSTER-711 at 4/15/20 8:46 AM:
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[~tomas.briceno] I can reproduce the problem.

Can you elaborate what's the use case? The primary usage in mind was to create separate <Engine>s, rather than services. What's the expectation as to which service is supposed to be registered with the LB? And why is not a plurality of Engines used in this use case?


was (Author: rhusar):
[~tomas.briceno] I can reproduce the problem. It appears that mod_cluster has not really been designed around usage of multiple services. Can you elaborate what's the use case? The primary usage in mind was to create separate <Engine>s, rather than services. What's the expectation as to which service is supposed to be registered with the LB? And why is not a plurality of Engines used in this use case?

> Using "connectorPort" property fails if multiple services are configured in Tomcat
> ----------------------------------------------------------------------------------
>
>                 Key: MODCLUSTER-711
>                 URL: https://issues.redhat.com/browse/MODCLUSTER-711
>             Project: mod_cluster
>          Issue Type: Bug
>          Components: Core &amp; Container Integration (Java)
>    Affects Versions: 1.4.0.Final
>            Reporter: Tomas Briceno Fernandez
>            Assignee: Radoslav Husar
>            Priority: Major
>             Fix For: 2.0.0.Alpha1, 1.4.2.Final
>
>
> If the Tomcat server configuration has several <service> elements and the mod_cluster listener is configured with *connectorPort* (most probably it is the same with *connectorAddress*), the configuration fails with these messages:
> {code}
> 06-Feb-2020 16:11:17.596 INFO [ContainerBackgroundProcessor[StandardEngine[TestEngine]]] org.jboss.modcluster.ModClusterService.connectionEstablished MODCLUSTER000012: TestEngine connector will use /127.0.0.1
> 06-Feb-2020 16:11:17.598 INFO [ContainerBackgroundProcessor[StandardEngine[TestEngine]]] org.jboss.modcluster.ModClusterService.establishJvmRoute MODCLUSTER000011: TestEngine will use 7bb39e02-96c0-3f8f-9fab-d464ad729cfe as jvm-route
> 06-Feb-2020 16:11:17.598 SEVERE [ContainerBackgroundProcessor[StandardEngine[TestEngine]]] org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren Exception invoking periodic operation: 
>  java.lang.RuntimeException: MODCLUSTER000047: No configured connector matches specified host:port (*:8081)! Ensure connectorPort and/or connectorAddress are configured.
> 	at org.jboss.modcluster.container.tomcat.ConfigurableProxyConnectorProvider.createProxyConnector(ConfigurableProxyConnectorProvider.java:89)
> 	at org.jboss.modcluster.container.tomcat.TomcatEngine.getProxyConnector(TomcatEngine.java:140)
> 	at org.jboss.modcluster.ModClusterService.connectionEstablished(ModClusterService.java:267)
> 	at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:341)
> 	at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:315)
> 	at org.jboss.modcluster.ModClusterService.status(ModClusterService.java:388)
> 	at org.jboss.modcluster.container.tomcat.TomcatEventHandlerAdapter.lifecycleEvent(TomcatEventHandlerAdapter.java:229)
> 	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
> 	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1174)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1396)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1368)
> 	at java.lang.Thread.run(Thread.java:748)
> {code}
> My own code inspection suggests this is because of this loop :
> {code:title=org.jboss.modcluster.ModClusterService}
>     @Override
>     public void connectionEstablished(InetAddress localAddress) {
>         for (Engine engine : this.server.getEngines()) {
>             Connector connector = engine.getProxyConnector();
>             InetAddress address = connector.getAddress();
>             // Set connector address
>             if ((address == null) || address.isAnyLocalAddress()) {
>                 connector.setAddress(localAddress);
>                 ModClusterLogger.LOGGER.detectConnectorAddress(engine, localAddress);
>             }
>             this.establishJvmRoute(engine);
>         }
>         this.established = true;
>     }
> {code}
> The problem here is that the invocation of *engine.getProxyConnector()* will check if one and only one of the connectors in the engine matches the port configured by *connectorPort*. If more that one service is configured there will be multiple engines and this code will apply the previous condition to all of them. That is, to properly exit this method the port should exist in all engines, which will not happen normally.



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