High CPU at specific time for few hours
Platform notice: Server and Data Center only. This article only applies to Atlassian products on the Server and Data Center platforms.
Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
Daily at a specific time for example 1 am , the CPU is high more than 50 % most of the time .
The following appears in the atlassian-confluence.log
2015-08-07 01:11:00,012 INFO [scheduler_Worker-1] [userprofile.synchronization.modules.LDAPUserDataSyncJob] doExecute Starting job based synchronization for all LDAP users.
...
2015-08-07 03:03:43,366 WARN [scheduler_Worker-1] [confluence.util.profiling.DurationThresholdWarningTimingHelperFactory] logMessage Execution time for publishing event de.communardo.confluence.plugins.userprofile.synchronization.modules.LDAPUserDataSyncFinishedEvent[source=de.communardo.confluence.plugins.userprofile.synchronization.modules.LDAPUserDataSyncJob@3414c2d5] took 2735638 ms (warning threshold is 5000 ms)
2015-08-07 03:03:43,367 INFO [scheduler_Worker-1] [userprofile.synchronization.modules.LDAPUserDataSyncJob] doExecute Finished job based synchronization for all LDAP users.Cause
The issue is related to third-party add-on User Profiles for Confluence and is caused by a CSV export which is automatically written after the nightly synchronization of the User Profiles for Confluence app.
Resolution
If you do not need the automatic nightly export, there is a workaround documented in this third-party KB: High CPU at specific time for few hours.