I keep seeing this showing up in my log...
2013-06-28 00:39:26,557 WARN [http-8090-10] [confluence.pages.actions.AbstractDiffPagesAction] execute Error while generating diff: (page: DEVINT7 Deployment
s v.73 (13893866) vs page: DEVINT7 Deployments v.74 (13893890))
-- url: /pages/diffpagesbyversion.action | page: 10846216 | userName: anonymous | action: diffpagesbyversion
Ill see that about 3 times in a row several different times through the night....almost never during the day when our instance is under load. Almost everytime after i see this error i see this...
2013-06-28 00:42:58,224 WARN [Timer-0] [mchange.v2.async.ThreadPoolAsynchronousRunner] run com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector
@65dd7810 -- APPARENT DEADLOCK!!! Complete Status:
Managed Threads: 3
Active Threads: 3
This can be hard to diagnose because the message does not necessarily mean there is a deadlock. The code will output an apparent deadlock message when it attempts to grab a new database connection and there is none available. It can also happen if your instance is running out of memory and generating page difference is quite a memory expensive task.
Perhaps you can try to increase the available memory and see if that would help.
From the look of the error I think your Confluence is actually running out of resources because this is usually what that deadlocking error suggests. However, as you say it is at night and the server ins't under load at the time I suspect it's the scheduled XML backup running and failing that you are seeing, (it's a very resource hungry process!). So, what I would suggest is ensuring the daily "Backup Confluence" job is disabled, (instructions here), and then ensure that you are implementing a proper production backup strategy by following these instructions: https://confluence.atlassian.com/display/DOC/Production+Backup+Strategy
All the best,
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