Product
Confluence
Environment
| Operating System | |
|---|---|
| Affect Version/s | |
| JVM | |
| Database | |
| Application Server |
Error Message
Database is being updated by an instance which is not part of the current cluster.
Symptom
A standalone Confluence instance was periodically shutting down with this error. No other instances were installed on the server, and there was no sign of the same instance being started twice.
Diagnostics/Test
First, double-check that no other instances are running, either on the local machine or others on the LAN.
Detailed Hibernate logging with parameters showed that the value of clustersafety.safetynumber had been changed unexpectedly, and exactly when. The database logs helped to show where the relevant queries had been initiated from.
Root Cause
The VM on which the Confluence instance was running had been copied, and started up in another office without the admin's knowledge. Confluence hadn't been disabled on the new copy, so it was starting up and connecting to the same database.
Solution
Shut down and disable Confluence on the other VM.