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https://issues.apache.org/jira/browse/JCR-1536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588560#action_12588560
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Thomas Mueller commented on JCR-1536:
-------------------------------------

Adding Thread.sleep(3200) between session.save() and copying the files 
solves the problem in most cases. Adding Thread.sleep(4000); always 
works on my machine (of course that's only a workaround, not a solution).


> "Index already present" exception when opening a restored repository
> --------------------------------------------------------------------
>
>                 Key: JCR-1536
>                 URL: https://issues.apache.org/jira/browse/JCR-1536
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: indexing
>            Reporter: Thomas Mueller
>            Priority: Minor
>
> I have created a new repository, added one node, then copied all files while 
> Jackrabbit is running.
> Then closed the repository, restored the backup, and tried to open the 
> repository.
> Unfortunately, this resulted in the following exception:
> javax.jcr.RepositoryException: Index already present: Index already present: 
> Index already present
>       at 
> org.apache.jackrabbit.core.SearchManager.initializeQueryHandler(SearchManager.java:575)
>       at 
> org.apache.jackrabbit.core.SearchManager.<init>(SearchManager.java:255)
>       at 
> org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.getSearchManager(RepositoryImpl.java:1613)
>       at 
> org.apache.jackrabbit.core.RepositoryImpl.initWorkspace(RepositoryImpl.java:606)
> The backup contains the following index file:
> workspaces/default/index/redo.log
> There are no other files or directories or files in that directory (also no 
> _n directories). The content of redo.log is:
> -1 STR
> -1 ADD cafebabe-cafe-babe-cafe-babecafebabe
> -1 COM
> 0 STR
> 0 DEL cafebabe-cafe-babe-cafe-babecafebabe
> 0 ADD fa87759b-f9fe-4ba8-986c-d1914ffce3de
> 0 ADD eda04b36-9c21-4712-bedf-206c36f0e3d2
> 0 ADD ae917cca-a0bb-4ac0-a16d-805aac6c7b10
> 0 ADD cafebabe-cafe-babe-cafe-babecafebabe
> 0 COM
> 1 STR
> 1 ADD 0121f271-bbe7-4f71-a793-5f4380f3c487
> 1 COM

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