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Confluence Server Slow Dwon





There is a periodic slowdown during operation.

I checked realted logs. This logs are continuously output.

2019-05-29 11:16:38,517 WARN [alert-dispatch:thread-1] [confluence.alert-log] log 1559096198513 ; WARNING ; JVM ; JVM-1002 ; Garbage collection exceeded time limit ; not-detected ;  ;  ; {"durationInMillis":10222,"windowInMillis":20000,"limitPercent":10,"threadMemoryAllocations":"","threadDump":[]}
2019-05-29 11:16:38,520 WARN [alert-dispatch:thread-1] [atlassian-monitor] log 2019-05-29T02:16:38.513Z Component 'Java' alerted 'Garbage collection exceeded time limit' (details: {"durationInMillis":10222,"windowInMillis":20000,"limitPercent":10,"threadMemoryAllocations":"","threadDump":[]}, trigger: {"pluginKey": "not-detected"})


Restarting Confluence is fine for a while(about 2 weeks).


Our Confluence Server Version is 6.13.4.

We use Bitbucket, Confluence and Jira on one server. (100 user license)

  • Real user is about 60.
  • Server Memory : 32G


I thik the suspicious part is as follows

  • Configuration
    • Server.xml
      • maxThreads : 100
    • confluence.cfg.xml
      • hibernate.c3p0.max_size : 125
  • Backup
    • We perform the backup at dawn. Looking at the results of the monitoring, it seems that memory is being used at the maximum.
    • Memory.png


How can we solve this problem?


Thank you for your help.




2 answers

Long GC pause can cause performance issues.For GC tuning please refer.

Any updates on this, I suffer same issue - I think the key is 


{"pluginKey": "not-detected"})

First we increased the physical memory(32G -> 64G). And we increased the heap size of the following item. There has been no problem for two months now.

  • /opt/atlassian/confluence/bin/
    • CATALINA_OPTS="-Xms1024m -Xmx1024m -XX:+UseG1GC ${CATALINA_OPTS}" ------> CATALINA_OPTS="-Xms1500m -Xmx1500m -XX:+UseG1GC ${CATALINA_OPTS}"
    • 1024m -> 2000m

Hi Norman.  Did you ever find out any more information regarding the

{"pluginKey": "not-detected"}) alert?  We are suffering the same problem.

Sure, this was a problem in the Refined (Wiki) plugin.

The vendor was very helpfull and provided new jar file (the plugin is updated on the marketplace long time ago now)

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