Confluence process takes up 100% CPU due to legacy Calendar plugin
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. 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
Confluence is using all available CPU and pages take long time to load due to long Lucene queries.
Indexes are getting out of sync with the database.
The following error appears in the logs:
1
2
Plugin module confluence.extra.calendar:calendarpluginextractor is incompatible with this version of Confluence. You will need to upgrade to a newer version of the Calendar Plugin plugin. java.lang.NoSuchMethodError: org/apache/lucene/document/Document.add(Lorg/apache/lucene/document/Field;)V
java.lang.NoSuchMethodError: org/apache/lucene/document/Document.add(Lorg/apache/lucene/document/Field;)V
Cause
The Calendar plugin is incompatible with the Lucene library in Confluence and the index searches take a long time to complete. See CAL-230.
Resolution
Disable the extractor module in the Calendar plugin or the plugin itself.
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