Confluence Docs 3.0 : Cluster Panic triggers
This page last changed on Jan 29, 2009 by ivan@atlassian.com.
Cluster PanicUsually presents itself with the following error message: FATAL [DefaultQuartzScheduler_Worker-4] [confluence.cluster.safety.ClusterPanicListener] handleEvent Fatal error in Confluence cluster: Database is being updated by an instance which is not part of the current cluster. You should check network connections between cluster nodes, especially multicast traffic. In almost all cases, cluster panic events are caused by two or more instances of Confluence (in separate clusters) updating the same database. Such events are typically caused by one of the following issues: JVM paused (e.g. while swapping memory) can break communication between two nodesAlways watch the swapping activity of your server and avoid swapping due to lack of RAM. If there is not enough RAM available, your server may start swapping out some of Confluence's heap data to your hard disk. This will slow down the JVM's garbage collection (GC) considerably and affect Confluence's performance.
Two instances of Confluence have been started in your application serverThis is one of the most commonly encountered issues. The strangest case of this that we have seen so far involved a cloned image of a PC running Confluence that was later used in a remote office in a different city. The people using Confluence on the cloned instance were not aware that the original Confluence instance was also running and that both these Confluence instances were using the same production database server.
Two copies of your application server are running.Sometimes starting an application server twice will result in two processes running, even though only one can be accessed over the network.
Networking failure between nodes in the cluster
Database server stops respondingIf Coherence fails to retrieve the SafetyNumber from the database, the comparison will fail. If it fails to update it, the next comparison will fail, 30 seconds later.
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Document generated by Confluence on Nov 05, 2009 23:26 |