Resolving Umbraco Examine cannot index queue items error

Introduction

Recently, while working with Umbraco 8.6.0 deployed on Azure I encountered an Examine error:

Cannot index queue items, the index is currently locked
Umbraco.Examine.UmbracoContentIndex

This is a nasty error that can cause a few problems like:

  • Crashing the whole app for visitors
  • Causing all kinds of back-office errors (searching, editing, examine panel overview)
  • Making editors' work impossible
  • The sharp increase in log size causing additional storage costs. 

Log view - Examine cannot index queue items

Examine Management view - Failed to retrieve indexer details

Add SqlMainDomLock setting

You should follow the great thread here to get some good insights regarding Examine lock-related errors.

To resolve the issue consider adding an additional setting to your appSettings section:  

<add
    key="Umbraco.Core.MainDom.Lock"
    value="SqlMainDomLock" />

Umbraco's recommended configuration can be found here and most essential part is:

<add
    key="Umbraco.Core.MainDom.Lock"
    value="SqlMainDomLock" />
<add
    key="Umbraco.Core.LocalTempStorage"
    value="EnvironmentTemp" />
<add
    key="Umbraco.Examine.LuceneDirectoryFactory"
    value="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory, Examine" />

Rebuild Examine indexes

Once you configure/fix the app properly, you should:

  • Delete all sub-folders in \App_Data\TEMP\ExamineIndexes (External, Internal, Members) with all lock files
  • Restart the app
  • Rebuilt indexes manually via backoffice panel (if index rebuilding does not happen automatically)

References

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