High CPU load at specific time for few hours
Problem
Daily at a specific time, for example 1 am, the CPU load is higher 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
This behavior 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 to mitigate that problem:
go to the user data export configuration via Administration > Users & Security - User Profile Configuration > Export
at "Filter" enter a phrase which will cause to filter out every user for the export
example phrase "filterWhichCausesExportToBeEmpty"
Click "Save"
That will cause the nightly export to finish instantly and prevent the high load over a longer period of time.
If you need the export, or need assistance with the workaround, please contact our support.