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https://issues.apache.org/jira/browse/SOLR-16866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847106#comment-17847106
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Chris M. Hostetter commented on SOLR-16866:
-------------------------------------------

Also, FWIW: I'm not familiar enough with the code paths involved to know if 
switching to {{File.separatorChar}} is the right fix (are these Strings 
filesystem paths, or "conceptual" paths that have been "normalized" ) but given 
the windows test failures i'm going to assume your latest patch is valid.

If no one with a windows box (or better confidence in the code) can validate, i 
suggest you commit to main and watch the Windows jenkins builds like a hawk, 
and if it starts passing then merge to 9x / 9.6.1

> CachingDirectoryFactory Throwing Error When Closing
> ---------------------------------------------------
>
>                 Key: SOLR-16866
>                 URL: https://issues.apache.org/jira/browse/SOLR-16866
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 9.2.1
>            Reporter: Stefan Pieper
>            Assignee: Michael Gibney
>            Priority: Major
>              Labels: core
>             Fix For: 9.6
>
>         Attachments: solr.blueprint_gnylctsgemcz_users.log
>
>          Time Spent: 3h 40m
>  Remaining Estimate: 0h
>
> Observed occasional ERROR log entries when {{CachingDirectryFactory#close()}} 
> is called. The respective snippet from the log is this:
> {noformat}
> 2023-07-06 08:43:37.618 DEBUG (qtp212011969-1801) [   
> blueprint_gnylctsgemcz_users] o.a.s.c.CachingDirectoryFactory Removing 
> directory after core close: /var/solr/data/blueprint_gnylctsgemcz_users/data
> 2023-07-06 08:43:37.620 DEBUG (qtp212011969-1801) [   
> blueprint_gnylctsgemcz_users] o.a.s.c.CachingDirectoryFactory Removing 
> directory after core close: 
> /var/solr/data/blueprint_gnylctsgemcz_users/data/index
> 2023-07-06 08:43:37.620 ERROR (qtp212011969-1801) [   
> blueprint_gnylctsgemcz_users] o.a.s.c.CachingDirectoryFactory Error removing 
> directory => java.nio.file.NoSuchFileException: 
> /var/solr/data/blueprint_gnylctsgemcz_users/data/index
> java.nio.file.NoSuchFileException: 
> /var/solr/data/blueprint_gnylctsgemcz_users/data/index
> {noformat}
> It seems like the order of directory removal is causing this (first parent 
> dir _data_, then sub-dir _data/index_). Entries should be re-arranged or just 
> the parent dir be handled.
> Full log with entries dealing with the respective core is attached.



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